diff --git a/crates/ra_syntax/src/tests.rs b/crates/ra_syntax/src/tests.rs
index f79dc4f933e..fb22b9e54c4 100644
--- a/crates/ra_syntax/src/tests.rs
+++ b/crates/ra_syntax/src/tests.rs
@@ -1,19 +1,28 @@
 use std::{
     fmt::Write,
-    path::{Component, PathBuf},
+    path::{Component, Path, PathBuf},
 };
 
 use test_utils::{collect_tests, dir_tests, project_dir, read_text};
 
-use crate::{fuzz, SourceFile};
+use crate::{fuzz, tokenize, Location, SourceFile, SyntaxError, TextRange, Token};
 
 #[test]
 fn lexer_tests() {
-    dir_tests(&test_data_dir(), &["lexer"], |text, _| {
-        // FIXME: add tests for errors (their format is up to discussion)
-        let (tokens, _errors) = crate::tokenize(text);
-        dump_tokens(&tokens, text)
-    })
+    // FIXME:
+    // * Add tests for unicode escapes in byte-character and [raw]-byte-string literals
+    // * Add tests for unescape errors
+
+    dir_tests(&test_data_dir(), &["lexer/ok"], |text, path| {
+        let (tokens, errors) = tokenize(text);
+        assert_errors_are_absent(&errors, path);
+        dump_tokens_and_errors(&tokens, &errors, text)
+    });
+    dir_tests(&test_data_dir(), &["lexer/err"], |text, path| {
+        let (tokens, errors) = tokenize(text);
+        assert_errors_are_present(&errors, path);
+        dump_tokens_and_errors(&tokens, &errors, text)
+    });
 }
 
 #[test]
@@ -33,18 +42,13 @@ fn parser_tests() {
     dir_tests(&test_data_dir(), &["parser/inline/ok", "parser/ok"], |text, path| {
         let parse = SourceFile::parse(text);
         let errors = parse.errors();
-        assert_eq!(
-            errors,
-            &[] as &[crate::SyntaxError],
-            "There should be no errors in the file {:?}",
-            path.display(),
-        );
+        assert_errors_are_absent(&errors, path);
         parse.debug_dump()
     });
     dir_tests(&test_data_dir(), &["parser/err", "parser/inline/err"], |text, path| {
         let parse = SourceFile::parse(text);
         let errors = parse.errors();
-        assert!(!errors.is_empty(), "There should be errors in the file {:?}", path.display());
+        assert_errors_are_present(&errors, path);
         parse.debug_dump()
     });
 }
@@ -76,7 +80,7 @@ fn self_hosting_parsing() {
         .into_iter()
         .filter_entry(|entry| {
             !entry.path().components().any(|component| {
-                // Get all files which are not in the crates/ra_syntax/tests/data folder
+                // Get all files which are not in the crates/ra_syntax/test_data folder
                 component == Component::Normal(OsStr::new("test_data"))
             })
         })
@@ -102,15 +106,47 @@ fn test_data_dir() -> PathBuf {
     project_dir().join("crates/ra_syntax/test_data")
 }
 
-fn dump_tokens(tokens: &[crate::Token], text: &str) -> String {
+fn assert_errors_are_present(errors: &[SyntaxError], path: &Path) {
+    assert!(!errors.is_empty(), "There should be errors in the file {:?}", path.display());
+}
+fn assert_errors_are_absent(errors: &[SyntaxError], path: &Path) {
+    assert_eq!(
+        errors,
+        &[] as &[SyntaxError],
+        "There should be no errors in the file {:?}",
+        path.display(),
+    );
+}
+
+fn dump_tokens_and_errors(tokens: &[Token], errors: &[SyntaxError], text: &str) -> String {
     let mut acc = String::new();
     let mut offset = 0;
     for token in tokens {
-        let len: u32 = token.len.into();
-        let len = len as usize;
-        let token_text = &text[offset..offset + len];
-        offset += len;
-        write!(acc, "{:?} {} {:?}\n", token.kind, token.len, token_text).unwrap()
+        let token_len = token.len.to_usize();
+        let token_text = &text[offset..offset + token_len];
+        offset += token_len;
+        writeln!(acc, "{:?} {} {:?}", token.kind, token_len, token_text).unwrap();
+    }
+    for err in errors {
+        let err_range = location_to_range(err.location());
+        writeln!(
+            acc,
+            "> error{:?} token({:?}) msg({})",
+            err.location(),
+            &text[err_range],
+            err.kind()
+        )
+        .unwrap();
+    }
+    return acc;
+
+    // FIXME: copy-pasted this from `ra_ide/src/diagnostics.rs`
+    // `Location` will be refactored soon in new PR, see todos here:
+    // https://github.com/rust-analyzer/rust-analyzer/issues/223
+    fn location_to_range(location: Location) -> TextRange {
+        match location {
+            Location::Offset(offset) => TextRange::offset_len(offset, 1.into()),
+            Location::Range(range) => range,
+        }
     }
-    acc
 }
diff --git a/crates/ra_syntax/src/validation.rs b/crates/ra_syntax/src/validation.rs
index 445e3b3e469..8a5f0e4b755 100644
--- a/crates/ra_syntax/src/validation.rs
+++ b/crates/ra_syntax/src/validation.rs
@@ -94,6 +94,12 @@ impl From<rustc_lexer::unescape::EscapeError> for SyntaxErrorKind {
 }
 
 pub(crate) fn validate(root: &SyntaxNode) -> Vec<SyntaxError> {
+    // FIXME:
+    // * Add validation of character literal containing only a single char
+    // * Add validation of `crate` keyword not appearing in the middle of the symbol path
+    // * Add validation of doc comments are being attached to nodes
+    // * Remove validation of unterminated literals (it is already implemented in `tokenize()`)
+
     let mut errors = Vec::new();
     for node in root.descendants() {
         match_ast! {
diff --git a/crates/ra_syntax/test_data/lexer/0010_comments.rs b/crates/ra_syntax/test_data/lexer/0010_comments.rs
deleted file mode 100644
index 71bdd1f9c32..00000000000
--- a/crates/ra_syntax/test_data/lexer/0010_comments.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/env bash
-// hello
-//! World
diff --git a/crates/ra_syntax/test_data/lexer/0010_comments.txt b/crates/ra_syntax/test_data/lexer/0010_comments.txt
deleted file mode 100644
index 3c997de3f1d..00000000000
--- a/crates/ra_syntax/test_data/lexer/0010_comments.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-SHEBANG 19 "#!/usr/bin/env bash"
-WHITESPACE 1 "\n"
-COMMENT 8 "// hello"
-WHITESPACE 1 "\n"
-COMMENT 9 "//! World"
-WHITESPACE 1 "\n"
diff --git a/crates/ra_syntax/test_data/lexer/0014_unclosed_char.rs b/crates/ra_syntax/test_data/lexer/0014_unclosed_char.rs
deleted file mode 100644
index 9c000707726..00000000000
--- a/crates/ra_syntax/test_data/lexer/0014_unclosed_char.rs
+++ /dev/null
@@ -1 +0,0 @@
-'1
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/0014_unclosed_char.txt b/crates/ra_syntax/test_data/lexer/0014_unclosed_char.txt
deleted file mode 100644
index 737a300ee78..00000000000
--- a/crates/ra_syntax/test_data/lexer/0014_unclosed_char.txt
+++ /dev/null
@@ -1 +0,0 @@
-LIFETIME 2 "\'1"
diff --git a/crates/ra_syntax/test_data/lexer/0015_unclosed_string.rs b/crates/ra_syntax/test_data/lexer/0015_unclosed_string.rs
deleted file mode 100644
index d771a26d499..00000000000
--- a/crates/ra_syntax/test_data/lexer/0015_unclosed_string.rs
+++ /dev/null
@@ -1 +0,0 @@
-"hello
diff --git a/crates/ra_syntax/test_data/lexer/0015_unclosed_string.txt b/crates/ra_syntax/test_data/lexer/0015_unclosed_string.txt
deleted file mode 100644
index 728c40b6624..00000000000
--- a/crates/ra_syntax/test_data/lexer/0015_unclosed_string.txt
+++ /dev/null
@@ -1 +0,0 @@
-STRING 7 "\"hello\n"
diff --git a/crates/ra_syntax/test_data/lexer/err/0001_unclosed_char_at_eof.rs b/crates/ra_syntax/test_data/lexer/err/0001_unclosed_char_at_eof.rs
new file mode 100644
index 00000000000..ad2823b48f7
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0001_unclosed_char_at_eof.rs
@@ -0,0 +1 @@
+'
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0001_unclosed_char_at_eof.txt b/crates/ra_syntax/test_data/lexer/err/0001_unclosed_char_at_eof.txt
new file mode 100644
index 00000000000..f24e1fd32a5
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0001_unclosed_char_at_eof.txt
@@ -0,0 +1,2 @@
+CHAR 1 "\'"
+> error[0; 1) token("\'") msg(Missing trailing `'` symbol to terminate the character literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0002_unclosed_char_with_ferris.rs b/crates/ra_syntax/test_data/lexer/err/0002_unclosed_char_with_ferris.rs
new file mode 100644
index 00000000000..e264a415280
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0002_unclosed_char_with_ferris.rs
@@ -0,0 +1 @@
+'🦀
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0002_unclosed_char_with_ferris.txt b/crates/ra_syntax/test_data/lexer/err/0002_unclosed_char_with_ferris.txt
new file mode 100644
index 00000000000..bd08cfc4489
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0002_unclosed_char_with_ferris.txt
@@ -0,0 +1,2 @@
+CHAR 5 "\'🦀"
+> error[0; 5) token("\'🦀") msg(Missing trailing `'` symbol to terminate the character literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0003_unclosed_char_with_ascii_escape.rs b/crates/ra_syntax/test_data/lexer/err/0003_unclosed_char_with_ascii_escape.rs
new file mode 100644
index 00000000000..cf74b4dad3b
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0003_unclosed_char_with_ascii_escape.rs
@@ -0,0 +1 @@
+'\x7f
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0003_unclosed_char_with_ascii_escape.txt b/crates/ra_syntax/test_data/lexer/err/0003_unclosed_char_with_ascii_escape.txt
new file mode 100644
index 00000000000..0ee22912d14
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0003_unclosed_char_with_ascii_escape.txt
@@ -0,0 +1,2 @@
+CHAR 5 "\'\\x7f"
+> error[0; 5) token("\'\\x7f") msg(Missing trailing `'` symbol to terminate the character literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0004_unclosed_char_with_unicode_escape.rs b/crates/ra_syntax/test_data/lexer/err/0004_unclosed_char_with_unicode_escape.rs
new file mode 100644
index 00000000000..50be91f6852
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0004_unclosed_char_with_unicode_escape.rs
@@ -0,0 +1 @@
+'\u{20AA}
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0004_unclosed_char_with_unicode_escape.txt b/crates/ra_syntax/test_data/lexer/err/0004_unclosed_char_with_unicode_escape.txt
new file mode 100644
index 00000000000..96fac42ce79
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0004_unclosed_char_with_unicode_escape.txt
@@ -0,0 +1,2 @@
+CHAR 9 "\'\\u{20AA}"
+> error[0; 9) token("\'\\u{20AA}") msg(Missing trailing `'` symbol to terminate the character literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0005_unclosed_char_with_space.rs b/crates/ra_syntax/test_data/lexer/err/0005_unclosed_char_with_space.rs
new file mode 100644
index 00000000000..309ecfe4786
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0005_unclosed_char_with_space.rs
@@ -0,0 +1 @@
+' 
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0005_unclosed_char_with_space.txt b/crates/ra_syntax/test_data/lexer/err/0005_unclosed_char_with_space.txt
new file mode 100644
index 00000000000..2059f3f81fc
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0005_unclosed_char_with_space.txt
@@ -0,0 +1,2 @@
+CHAR 2 "\' "
+> error[0; 2) token("\' ") msg(Missing trailing `'` symbol to terminate the character literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0006_unclosed_char_with_slash.rs b/crates/ra_syntax/test_data/lexer/err/0006_unclosed_char_with_slash.rs
new file mode 100644
index 00000000000..6ba258b1093
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0006_unclosed_char_with_slash.rs
@@ -0,0 +1 @@
+'\
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0006_unclosed_char_with_slash.txt b/crates/ra_syntax/test_data/lexer/err/0006_unclosed_char_with_slash.txt
new file mode 100644
index 00000000000..7dd376e5971
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0006_unclosed_char_with_slash.txt
@@ -0,0 +1,2 @@
+CHAR 2 "\'\\"
+> error[0; 2) token("\'\\") msg(Missing trailing `'` symbol to terminate the character literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0007_unclosed_char_with_slash_n.rs b/crates/ra_syntax/test_data/lexer/err/0007_unclosed_char_with_slash_n.rs
new file mode 100644
index 00000000000..78bef7e3eb2
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0007_unclosed_char_with_slash_n.rs
@@ -0,0 +1 @@
+'\n
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0007_unclosed_char_with_slash_n.txt b/crates/ra_syntax/test_data/lexer/err/0007_unclosed_char_with_slash_n.txt
new file mode 100644
index 00000000000..ef7a0a147d0
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0007_unclosed_char_with_slash_n.txt
@@ -0,0 +1,2 @@
+CHAR 3 "\'\\n"
+> error[0; 3) token("\'\\n") msg(Missing trailing `'` symbol to terminate the character literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0008_unclosed_char_with_slash_single_quote.rs b/crates/ra_syntax/test_data/lexer/err/0008_unclosed_char_with_slash_single_quote.rs
new file mode 100644
index 00000000000..a0e722065bd
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0008_unclosed_char_with_slash_single_quote.rs
@@ -0,0 +1 @@
+'\'
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0008_unclosed_char_with_slash_single_quote.txt b/crates/ra_syntax/test_data/lexer/err/0008_unclosed_char_with_slash_single_quote.txt
new file mode 100644
index 00000000000..13fc5ea9ac4
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0008_unclosed_char_with_slash_single_quote.txt
@@ -0,0 +1,2 @@
+CHAR 3 "\'\\\'"
+> error[0; 3) token("\'\\\'") msg(Missing trailing `'` symbol to terminate the character literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0009_unclosed_byte_at_eof.rs b/crates/ra_syntax/test_data/lexer/err/0009_unclosed_byte_at_eof.rs
new file mode 100644
index 00000000000..795dc7e25c5
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0009_unclosed_byte_at_eof.rs
@@ -0,0 +1 @@
+b'
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0009_unclosed_byte_at_eof.txt b/crates/ra_syntax/test_data/lexer/err/0009_unclosed_byte_at_eof.txt
new file mode 100644
index 00000000000..269d68c74ac
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0009_unclosed_byte_at_eof.txt
@@ -0,0 +1,2 @@
+BYTE 2 "b\'"
+> error[0; 2) token("b\'") msg(Missing trailing `'` symbol to terminate the byte literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0010_unclosed_byte_with_ferris.rs b/crates/ra_syntax/test_data/lexer/err/0010_unclosed_byte_with_ferris.rs
new file mode 100644
index 00000000000..c9230dc24ea
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0010_unclosed_byte_with_ferris.rs
@@ -0,0 +1 @@
+b'🦀
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0010_unclosed_byte_with_ferris.txt b/crates/ra_syntax/test_data/lexer/err/0010_unclosed_byte_with_ferris.txt
new file mode 100644
index 00000000000..91a76e479ab
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0010_unclosed_byte_with_ferris.txt
@@ -0,0 +1,2 @@
+BYTE 6 "b\'🦀"
+> error[0; 6) token("b\'🦀") msg(Missing trailing `'` symbol to terminate the byte literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0011_unclosed_byte_with_ascii_escape.rs b/crates/ra_syntax/test_data/lexer/err/0011_unclosed_byte_with_ascii_escape.rs
new file mode 100644
index 00000000000..d146a8090d1
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0011_unclosed_byte_with_ascii_escape.rs
@@ -0,0 +1 @@
+b'\x7f
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0011_unclosed_byte_with_ascii_escape.txt b/crates/ra_syntax/test_data/lexer/err/0011_unclosed_byte_with_ascii_escape.txt
new file mode 100644
index 00000000000..b8c804a1894
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0011_unclosed_byte_with_ascii_escape.txt
@@ -0,0 +1,2 @@
+BYTE 6 "b\'\\x7f"
+> error[0; 6) token("b\'\\x7f") msg(Missing trailing `'` symbol to terminate the byte literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0012_unclosed_byte_with_unicode_escape.rs b/crates/ra_syntax/test_data/lexer/err/0012_unclosed_byte_with_unicode_escape.rs
new file mode 100644
index 00000000000..a3dec7c255d
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0012_unclosed_byte_with_unicode_escape.rs
@@ -0,0 +1 @@
+b'\u{20AA}
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0012_unclosed_byte_with_unicode_escape.txt b/crates/ra_syntax/test_data/lexer/err/0012_unclosed_byte_with_unicode_escape.txt
new file mode 100644
index 00000000000..dfca22a5982
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0012_unclosed_byte_with_unicode_escape.txt
@@ -0,0 +1,2 @@
+BYTE 10 "b\'\\u{20AA}"
+> error[0; 10) token("b\'\\u{20AA}") msg(Missing trailing `'` symbol to terminate the byte literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0013_unclosed_byte_with_space.rs b/crates/ra_syntax/test_data/lexer/err/0013_unclosed_byte_with_space.rs
new file mode 100644
index 00000000000..93b7f9c87c9
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0013_unclosed_byte_with_space.rs
@@ -0,0 +1 @@
+b' 
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0013_unclosed_byte_with_space.txt b/crates/ra_syntax/test_data/lexer/err/0013_unclosed_byte_with_space.txt
new file mode 100644
index 00000000000..51a1cceabdf
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0013_unclosed_byte_with_space.txt
@@ -0,0 +1,2 @@
+BYTE 3 "b\' "
+> error[0; 3) token("b\' ") msg(Missing trailing `'` symbol to terminate the byte literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0014_unclosed_byte_with_slash.rs b/crates/ra_syntax/test_data/lexer/err/0014_unclosed_byte_with_slash.rs
new file mode 100644
index 00000000000..abffa5037c0
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0014_unclosed_byte_with_slash.rs
@@ -0,0 +1 @@
+b'\
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0014_unclosed_byte_with_slash.txt b/crates/ra_syntax/test_data/lexer/err/0014_unclosed_byte_with_slash.txt
new file mode 100644
index 00000000000..24e835c2795
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0014_unclosed_byte_with_slash.txt
@@ -0,0 +1,2 @@
+BYTE 3 "b\'\\"
+> error[0; 3) token("b\'\\") msg(Missing trailing `'` symbol to terminate the byte literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0015_unclosed_byte_with_slash_n.rs b/crates/ra_syntax/test_data/lexer/err/0015_unclosed_byte_with_slash_n.rs
new file mode 100644
index 00000000000..4f46836a935
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0015_unclosed_byte_with_slash_n.rs
@@ -0,0 +1 @@
+b'\n
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0015_unclosed_byte_with_slash_n.txt b/crates/ra_syntax/test_data/lexer/err/0015_unclosed_byte_with_slash_n.txt
new file mode 100644
index 00000000000..f1e39a41ba0
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0015_unclosed_byte_with_slash_n.txt
@@ -0,0 +1,2 @@
+BYTE 4 "b\'\\n"
+> error[0; 4) token("b\'\\n") msg(Missing trailing `'` symbol to terminate the byte literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0016_unclosed_byte_with_slash_single_quote.rs b/crates/ra_syntax/test_data/lexer/err/0016_unclosed_byte_with_slash_single_quote.rs
new file mode 100644
index 00000000000..645b641eedb
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0016_unclosed_byte_with_slash_single_quote.rs
@@ -0,0 +1 @@
+b'\'
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0016_unclosed_byte_with_slash_single_quote.txt b/crates/ra_syntax/test_data/lexer/err/0016_unclosed_byte_with_slash_single_quote.txt
new file mode 100644
index 00000000000..f8ffe815d42
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0016_unclosed_byte_with_slash_single_quote.txt
@@ -0,0 +1,2 @@
+BYTE 4 "b\'\\\'"
+> error[0; 4) token("b\'\\\'") msg(Missing trailing `'` symbol to terminate the byte literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0017_unclosed_string_at_eof.rs b/crates/ra_syntax/test_data/lexer/err/0017_unclosed_string_at_eof.rs
new file mode 100644
index 00000000000..9d68933c44f
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0017_unclosed_string_at_eof.rs
@@ -0,0 +1 @@
+"
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0017_unclosed_string_at_eof.txt b/crates/ra_syntax/test_data/lexer/err/0017_unclosed_string_at_eof.txt
new file mode 100644
index 00000000000..823daaf6f7a
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0017_unclosed_string_at_eof.txt
@@ -0,0 +1,2 @@
+STRING 1 "\""
+> error[0; 1) token("\"") msg(Missing trailing `"` symbol to terminate the string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0018_unclosed_string_with_ferris.rs b/crates/ra_syntax/test_data/lexer/err/0018_unclosed_string_with_ferris.rs
new file mode 100644
index 00000000000..d439b8d2a1d
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0018_unclosed_string_with_ferris.rs
@@ -0,0 +1 @@
+"🦀
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0018_unclosed_string_with_ferris.txt b/crates/ra_syntax/test_data/lexer/err/0018_unclosed_string_with_ferris.txt
new file mode 100644
index 00000000000..164580eb35d
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0018_unclosed_string_with_ferris.txt
@@ -0,0 +1,2 @@
+STRING 5 "\"🦀"
+> error[0; 5) token("\"🦀") msg(Missing trailing `"` symbol to terminate the string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0019_unclosed_string_with_ascii_escape.rs b/crates/ra_syntax/test_data/lexer/err/0019_unclosed_string_with_ascii_escape.rs
new file mode 100644
index 00000000000..56186a34444
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0019_unclosed_string_with_ascii_escape.rs
@@ -0,0 +1 @@
+"\x7f
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0019_unclosed_string_with_ascii_escape.txt b/crates/ra_syntax/test_data/lexer/err/0019_unclosed_string_with_ascii_escape.txt
new file mode 100644
index 00000000000..4453827c303
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0019_unclosed_string_with_ascii_escape.txt
@@ -0,0 +1,2 @@
+STRING 5 "\"\\x7f"
+> error[0; 5) token("\"\\x7f") msg(Missing trailing `"` symbol to terminate the string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0020_unclosed_string_with_unicode_escape.rs b/crates/ra_syntax/test_data/lexer/err/0020_unclosed_string_with_unicode_escape.rs
new file mode 100644
index 00000000000..ed24095c3d4
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0020_unclosed_string_with_unicode_escape.rs
@@ -0,0 +1 @@
+"\u{20AA}
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0020_unclosed_string_with_unicode_escape.txt b/crates/ra_syntax/test_data/lexer/err/0020_unclosed_string_with_unicode_escape.txt
new file mode 100644
index 00000000000..aa614f30461
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0020_unclosed_string_with_unicode_escape.txt
@@ -0,0 +1,2 @@
+STRING 9 "\"\\u{20AA}"
+> error[0; 9) token("\"\\u{20AA}") msg(Missing trailing `"` symbol to terminate the string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0021_unclosed_string_with_space.rs b/crates/ra_syntax/test_data/lexer/err/0021_unclosed_string_with_space.rs
new file mode 100644
index 00000000000..72cdc841fbd
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0021_unclosed_string_with_space.rs
@@ -0,0 +1 @@
+" 
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0021_unclosed_string_with_space.txt b/crates/ra_syntax/test_data/lexer/err/0021_unclosed_string_with_space.txt
new file mode 100644
index 00000000000..b7db1236ffa
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0021_unclosed_string_with_space.txt
@@ -0,0 +1,2 @@
+STRING 2 "\" "
+> error[0; 2) token("\" ") msg(Missing trailing `"` symbol to terminate the string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0022_unclosed_string_with_slash.rs b/crates/ra_syntax/test_data/lexer/err/0022_unclosed_string_with_slash.rs
new file mode 100644
index 00000000000..00a25840087
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0022_unclosed_string_with_slash.rs
@@ -0,0 +1 @@
+"\
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0022_unclosed_string_with_slash.txt b/crates/ra_syntax/test_data/lexer/err/0022_unclosed_string_with_slash.txt
new file mode 100644
index 00000000000..9d3df37991a
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0022_unclosed_string_with_slash.txt
@@ -0,0 +1,2 @@
+STRING 2 "\"\\"
+> error[0; 2) token("\"\\") msg(Missing trailing `"` symbol to terminate the string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0023_unclosed_string_with_slash_n.rs b/crates/ra_syntax/test_data/lexer/err/0023_unclosed_string_with_slash_n.rs
new file mode 100644
index 00000000000..a0c29b8cff7
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0023_unclosed_string_with_slash_n.rs
@@ -0,0 +1 @@
+"\n
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0023_unclosed_string_with_slash_n.txt b/crates/ra_syntax/test_data/lexer/err/0023_unclosed_string_with_slash_n.txt
new file mode 100644
index 00000000000..e3eb672b691
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0023_unclosed_string_with_slash_n.txt
@@ -0,0 +1,2 @@
+STRING 3 "\"\\n"
+> error[0; 3) token("\"\\n") msg(Missing trailing `"` symbol to terminate the string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0024_unclosed_string_with_slash_double_quote.rs b/crates/ra_syntax/test_data/lexer/err/0024_unclosed_string_with_slash_double_quote.rs
new file mode 100644
index 00000000000..403c2d6ddc6
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0024_unclosed_string_with_slash_double_quote.rs
@@ -0,0 +1 @@
+"\"
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0024_unclosed_string_with_slash_double_quote.txt b/crates/ra_syntax/test_data/lexer/err/0024_unclosed_string_with_slash_double_quote.txt
new file mode 100644
index 00000000000..041d7fb6efc
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0024_unclosed_string_with_slash_double_quote.txt
@@ -0,0 +1,2 @@
+STRING 3 "\"\\\""
+> error[0; 3) token("\"\\\"") msg(Missing trailing `"` symbol to terminate the string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0025_unclosed_byte_string_at_eof.rs b/crates/ra_syntax/test_data/lexer/err/0025_unclosed_byte_string_at_eof.rs
new file mode 100644
index 00000000000..36f4f432187
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0025_unclosed_byte_string_at_eof.rs
@@ -0,0 +1 @@
+b"
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0025_unclosed_byte_string_at_eof.txt b/crates/ra_syntax/test_data/lexer/err/0025_unclosed_byte_string_at_eof.txt
new file mode 100644
index 00000000000..be7970a835b
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0025_unclosed_byte_string_at_eof.txt
@@ -0,0 +1,2 @@
+BYTE_STRING 2 "b\""
+> error[0; 2) token("b\"") msg(Missing trailing `"` symbol to terminate the byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0026_unclosed_byte_string_with_ferris.rs b/crates/ra_syntax/test_data/lexer/err/0026_unclosed_byte_string_with_ferris.rs
new file mode 100644
index 00000000000..3c23a037228
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0026_unclosed_byte_string_with_ferris.rs
@@ -0,0 +1 @@
+b"🦀
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0026_unclosed_byte_string_with_ferris.txt b/crates/ra_syntax/test_data/lexer/err/0026_unclosed_byte_string_with_ferris.txt
new file mode 100644
index 00000000000..bf9aab132cb
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0026_unclosed_byte_string_with_ferris.txt
@@ -0,0 +1,2 @@
+BYTE_STRING 6 "b\"🦀"
+> error[0; 6) token("b\"🦀") msg(Missing trailing `"` symbol to terminate the byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0027_unclosed_byte_string_with_ascii_escape.rs b/crates/ra_syntax/test_data/lexer/err/0027_unclosed_byte_string_with_ascii_escape.rs
new file mode 100644
index 00000000000..836c112c157
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0027_unclosed_byte_string_with_ascii_escape.rs
@@ -0,0 +1 @@
+b"\x7f
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0027_unclosed_byte_string_with_ascii_escape.txt b/crates/ra_syntax/test_data/lexer/err/0027_unclosed_byte_string_with_ascii_escape.txt
new file mode 100644
index 00000000000..76e16d7d348
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0027_unclosed_byte_string_with_ascii_escape.txt
@@ -0,0 +1,2 @@
+BYTE_STRING 6 "b\"\\x7f"
+> error[0; 6) token("b\"\\x7f") msg(Missing trailing `"` symbol to terminate the byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0028_unclosed_byte_string_with_unicode_escape.rs b/crates/ra_syntax/test_data/lexer/err/0028_unclosed_byte_string_with_unicode_escape.rs
new file mode 100644
index 00000000000..1c6df1d00e4
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0028_unclosed_byte_string_with_unicode_escape.rs
@@ -0,0 +1 @@
+b"\u{20AA}
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0028_unclosed_byte_string_with_unicode_escape.txt b/crates/ra_syntax/test_data/lexer/err/0028_unclosed_byte_string_with_unicode_escape.txt
new file mode 100644
index 00000000000..09adffa1601
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0028_unclosed_byte_string_with_unicode_escape.txt
@@ -0,0 +1,2 @@
+BYTE_STRING 10 "b\"\\u{20AA}"
+> error[0; 10) token("b\"\\u{20AA}") msg(Missing trailing `"` symbol to terminate the byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0029_unclosed_byte_string_with_space.rs b/crates/ra_syntax/test_data/lexer/err/0029_unclosed_byte_string_with_space.rs
new file mode 100644
index 00000000000..d6898541e62
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0029_unclosed_byte_string_with_space.rs
@@ -0,0 +1 @@
+b" 
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0029_unclosed_byte_string_with_space.txt b/crates/ra_syntax/test_data/lexer/err/0029_unclosed_byte_string_with_space.txt
new file mode 100644
index 00000000000..fcb7253c82b
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0029_unclosed_byte_string_with_space.txt
@@ -0,0 +1,2 @@
+BYTE_STRING 3 "b\" "
+> error[0; 3) token("b\" ") msg(Missing trailing `"` symbol to terminate the byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0030_unclosed_byte_string_with_slash.rs b/crates/ra_syntax/test_data/lexer/err/0030_unclosed_byte_string_with_slash.rs
new file mode 100644
index 00000000000..cce6615381d
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0030_unclosed_byte_string_with_slash.rs
@@ -0,0 +1 @@
+b"\
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0030_unclosed_byte_string_with_slash.txt b/crates/ra_syntax/test_data/lexer/err/0030_unclosed_byte_string_with_slash.txt
new file mode 100644
index 00000000000..0a1b3e26993
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0030_unclosed_byte_string_with_slash.txt
@@ -0,0 +1,2 @@
+BYTE_STRING 3 "b\"\\"
+> error[0; 3) token("b\"\\") msg(Missing trailing `"` symbol to terminate the byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0031_unclosed_byte_string_with_slash_n.rs b/crates/ra_syntax/test_data/lexer/err/0031_unclosed_byte_string_with_slash_n.rs
new file mode 100644
index 00000000000..5e680aabb7b
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0031_unclosed_byte_string_with_slash_n.rs
@@ -0,0 +1 @@
+b"\n
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0031_unclosed_byte_string_with_slash_n.txt b/crates/ra_syntax/test_data/lexer/err/0031_unclosed_byte_string_with_slash_n.txt
new file mode 100644
index 00000000000..1fb89d2b6d0
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0031_unclosed_byte_string_with_slash_n.txt
@@ -0,0 +1,2 @@
+BYTE_STRING 4 "b\"\\n"
+> error[0; 4) token("b\"\\n") msg(Missing trailing `"` symbol to terminate the byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0032_unclosed_byte_string_with_slash_double_quote.rs b/crates/ra_syntax/test_data/lexer/err/0032_unclosed_byte_string_with_slash_double_quote.rs
new file mode 100644
index 00000000000..f2ff58ba9a8
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0032_unclosed_byte_string_with_slash_double_quote.rs
@@ -0,0 +1 @@
+b"\"
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0032_unclosed_byte_string_with_slash_double_quote.txt b/crates/ra_syntax/test_data/lexer/err/0032_unclosed_byte_string_with_slash_double_quote.txt
new file mode 100644
index 00000000000..718d3699299
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0032_unclosed_byte_string_with_slash_double_quote.txt
@@ -0,0 +1,2 @@
+BYTE_STRING 4 "b\"\\\""
+> error[0; 4) token("b\"\\\"") msg(Missing trailing `"` symbol to terminate the byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0033_unclosed_raw_string_at_eof.rs b/crates/ra_syntax/test_data/lexer/err/0033_unclosed_raw_string_at_eof.rs
new file mode 100644
index 00000000000..557c59b6251
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0033_unclosed_raw_string_at_eof.rs
@@ -0,0 +1 @@
+r##"
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0033_unclosed_raw_string_at_eof.txt b/crates/ra_syntax/test_data/lexer/err/0033_unclosed_raw_string_at_eof.txt
new file mode 100644
index 00000000000..93348f548fd
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0033_unclosed_raw_string_at_eof.txt
@@ -0,0 +1,2 @@
+RAW_STRING 4 "r##\""
+> error[0; 4) token("r##\"") msg(Missing trailing `"` with `#` symbols to terminate the raw string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0034_unclosed_raw_string_with_ferris.rs b/crates/ra_syntax/test_data/lexer/err/0034_unclosed_raw_string_with_ferris.rs
new file mode 100644
index 00000000000..bd046e4bb91
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0034_unclosed_raw_string_with_ferris.rs
@@ -0,0 +1 @@
+r##"🦀
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0034_unclosed_raw_string_with_ferris.txt b/crates/ra_syntax/test_data/lexer/err/0034_unclosed_raw_string_with_ferris.txt
new file mode 100644
index 00000000000..42c70dfe836
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0034_unclosed_raw_string_with_ferris.txt
@@ -0,0 +1,2 @@
+RAW_STRING 8 "r##\"🦀"
+> error[0; 8) token("r##\"🦀") msg(Missing trailing `"` with `#` symbols to terminate the raw string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0035_unclosed_raw_string_with_ascii_escape.rs b/crates/ra_syntax/test_data/lexer/err/0035_unclosed_raw_string_with_ascii_escape.rs
new file mode 100644
index 00000000000..5bec883dc7a
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0035_unclosed_raw_string_with_ascii_escape.rs
@@ -0,0 +1 @@
+r##"\x7f
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0035_unclosed_raw_string_with_ascii_escape.txt b/crates/ra_syntax/test_data/lexer/err/0035_unclosed_raw_string_with_ascii_escape.txt
new file mode 100644
index 00000000000..2bdeea0ff53
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0035_unclosed_raw_string_with_ascii_escape.txt
@@ -0,0 +1,2 @@
+RAW_STRING 8 "r##\"\\x7f"
+> error[0; 8) token("r##\"\\x7f") msg(Missing trailing `"` with `#` symbols to terminate the raw string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0036_unclosed_raw_string_with_unicode_escape.rs b/crates/ra_syntax/test_data/lexer/err/0036_unclosed_raw_string_with_unicode_escape.rs
new file mode 100644
index 00000000000..bf05c39134b
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0036_unclosed_raw_string_with_unicode_escape.rs
@@ -0,0 +1 @@
+r##"\u{20AA}
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0036_unclosed_raw_string_with_unicode_escape.txt b/crates/ra_syntax/test_data/lexer/err/0036_unclosed_raw_string_with_unicode_escape.txt
new file mode 100644
index 00000000000..667d4d79f9f
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0036_unclosed_raw_string_with_unicode_escape.txt
@@ -0,0 +1,2 @@
+RAW_STRING 12 "r##\"\\u{20AA}"
+> error[0; 12) token("r##\"\\u{20AA}") msg(Missing trailing `"` with `#` symbols to terminate the raw string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0037_unclosed_raw_string_with_space.rs b/crates/ra_syntax/test_data/lexer/err/0037_unclosed_raw_string_with_space.rs
new file mode 100644
index 00000000000..f104bae4f2c
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0037_unclosed_raw_string_with_space.rs
@@ -0,0 +1 @@
+r##" 
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0037_unclosed_raw_string_with_space.txt b/crates/ra_syntax/test_data/lexer/err/0037_unclosed_raw_string_with_space.txt
new file mode 100644
index 00000000000..dd9597a1a9e
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0037_unclosed_raw_string_with_space.txt
@@ -0,0 +1,2 @@
+RAW_STRING 5 "r##\" "
+> error[0; 5) token("r##\" ") msg(Missing trailing `"` with `#` symbols to terminate the raw string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0038_unclosed_raw_string_with_slash.rs b/crates/ra_syntax/test_data/lexer/err/0038_unclosed_raw_string_with_slash.rs
new file mode 100644
index 00000000000..9242077b8b7
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0038_unclosed_raw_string_with_slash.rs
@@ -0,0 +1 @@
+r##"\
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0038_unclosed_raw_string_with_slash.txt b/crates/ra_syntax/test_data/lexer/err/0038_unclosed_raw_string_with_slash.txt
new file mode 100644
index 00000000000..6ac6e3d623d
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0038_unclosed_raw_string_with_slash.txt
@@ -0,0 +1,2 @@
+RAW_STRING 5 "r##\"\\"
+> error[0; 5) token("r##\"\\") msg(Missing trailing `"` with `#` symbols to terminate the raw string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0039_unclosed_raw_string_with_slash_n.rs b/crates/ra_syntax/test_data/lexer/err/0039_unclosed_raw_string_with_slash_n.rs
new file mode 100644
index 00000000000..db1c16f2ba5
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0039_unclosed_raw_string_with_slash_n.rs
@@ -0,0 +1 @@
+r##"\n
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0039_unclosed_raw_string_with_slash_n.txt b/crates/ra_syntax/test_data/lexer/err/0039_unclosed_raw_string_with_slash_n.txt
new file mode 100644
index 00000000000..9d35443f510
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0039_unclosed_raw_string_with_slash_n.txt
@@ -0,0 +1,2 @@
+RAW_STRING 6 "r##\"\\n"
+> error[0; 6) token("r##\"\\n") msg(Missing trailing `"` with `#` symbols to terminate the raw string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0040_unclosed_raw_byte_string_at_eof.rs b/crates/ra_syntax/test_data/lexer/err/0040_unclosed_raw_byte_string_at_eof.rs
new file mode 100644
index 00000000000..ae5bae62230
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0040_unclosed_raw_byte_string_at_eof.rs
@@ -0,0 +1 @@
+br##"
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0040_unclosed_raw_byte_string_at_eof.txt b/crates/ra_syntax/test_data/lexer/err/0040_unclosed_raw_byte_string_at_eof.txt
new file mode 100644
index 00000000000..81fa39ea515
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0040_unclosed_raw_byte_string_at_eof.txt
@@ -0,0 +1,2 @@
+RAW_BYTE_STRING 5 "br##\""
+> error[0; 5) token("br##\"") msg(Missing trailing `"` with `#` symbols to terminate the raw byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0041_unclosed_raw_byte_string_with_ferris.rs b/crates/ra_syntax/test_data/lexer/err/0041_unclosed_raw_byte_string_with_ferris.rs
new file mode 100644
index 00000000000..9ef01207a17
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0041_unclosed_raw_byte_string_with_ferris.rs
@@ -0,0 +1 @@
+br##"🦀
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0041_unclosed_raw_byte_string_with_ferris.txt b/crates/ra_syntax/test_data/lexer/err/0041_unclosed_raw_byte_string_with_ferris.txt
new file mode 100644
index 00000000000..c2503a4d050
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0041_unclosed_raw_byte_string_with_ferris.txt
@@ -0,0 +1,2 @@
+RAW_BYTE_STRING 9 "br##\"🦀"
+> error[0; 9) token("br##\"🦀") msg(Missing trailing `"` with `#` symbols to terminate the raw byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0042_unclosed_raw_byte_string_with_ascii_escape.rs b/crates/ra_syntax/test_data/lexer/err/0042_unclosed_raw_byte_string_with_ascii_escape.rs
new file mode 100644
index 00000000000..d50270afe1e
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0042_unclosed_raw_byte_string_with_ascii_escape.rs
@@ -0,0 +1 @@
+br##"\x7f
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0042_unclosed_raw_byte_string_with_ascii_escape.txt b/crates/ra_syntax/test_data/lexer/err/0042_unclosed_raw_byte_string_with_ascii_escape.txt
new file mode 100644
index 00000000000..3bd3d815296
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0042_unclosed_raw_byte_string_with_ascii_escape.txt
@@ -0,0 +1,2 @@
+RAW_BYTE_STRING 9 "br##\"\\x7f"
+> error[0; 9) token("br##\"\\x7f") msg(Missing trailing `"` with `#` symbols to terminate the raw byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0043_unclosed_raw_byte_string_with_unicode_escape.rs b/crates/ra_syntax/test_data/lexer/err/0043_unclosed_raw_byte_string_with_unicode_escape.rs
new file mode 100644
index 00000000000..90e299a1a97
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0043_unclosed_raw_byte_string_with_unicode_escape.rs
@@ -0,0 +1 @@
+br##"\u{20AA}
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0043_unclosed_raw_byte_string_with_unicode_escape.txt b/crates/ra_syntax/test_data/lexer/err/0043_unclosed_raw_byte_string_with_unicode_escape.txt
new file mode 100644
index 00000000000..a512f0428f5
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0043_unclosed_raw_byte_string_with_unicode_escape.txt
@@ -0,0 +1,2 @@
+RAW_BYTE_STRING 13 "br##\"\\u{20AA}"
+> error[0; 13) token("br##\"\\u{20AA}") msg(Missing trailing `"` with `#` symbols to terminate the raw byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0044_unclosed_raw_byte_string_with_space.rs b/crates/ra_syntax/test_data/lexer/err/0044_unclosed_raw_byte_string_with_space.rs
new file mode 100644
index 00000000000..14c602fd2b3
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0044_unclosed_raw_byte_string_with_space.rs
@@ -0,0 +1 @@
+br##" 
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0044_unclosed_raw_byte_string_with_space.txt b/crates/ra_syntax/test_data/lexer/err/0044_unclosed_raw_byte_string_with_space.txt
new file mode 100644
index 00000000000..dc616a623b2
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0044_unclosed_raw_byte_string_with_space.txt
@@ -0,0 +1,2 @@
+RAW_BYTE_STRING 6 "br##\" "
+> error[0; 6) token("br##\" ") msg(Missing trailing `"` with `#` symbols to terminate the raw byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0045_unclosed_raw_byte_string_with_slash.rs b/crates/ra_syntax/test_data/lexer/err/0045_unclosed_raw_byte_string_with_slash.rs
new file mode 100644
index 00000000000..0b3c015d74d
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0045_unclosed_raw_byte_string_with_slash.rs
@@ -0,0 +1 @@
+br##"\
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0045_unclosed_raw_byte_string_with_slash.txt b/crates/ra_syntax/test_data/lexer/err/0045_unclosed_raw_byte_string_with_slash.txt
new file mode 100644
index 00000000000..debafe380e4
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0045_unclosed_raw_byte_string_with_slash.txt
@@ -0,0 +1,2 @@
+RAW_BYTE_STRING 6 "br##\"\\"
+> error[0; 6) token("br##\"\\") msg(Missing trailing `"` with `#` symbols to terminate the raw byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0046_unclosed_raw_byte_string_with_slash_n.rs b/crates/ra_syntax/test_data/lexer/err/0046_unclosed_raw_byte_string_with_slash_n.rs
new file mode 100644
index 00000000000..0d8b0e7ab04
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0046_unclosed_raw_byte_string_with_slash_n.rs
@@ -0,0 +1 @@
+br##"\n
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0046_unclosed_raw_byte_string_with_slash_n.txt b/crates/ra_syntax/test_data/lexer/err/0046_unclosed_raw_byte_string_with_slash_n.txt
new file mode 100644
index 00000000000..524e617b77a
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0046_unclosed_raw_byte_string_with_slash_n.txt
@@ -0,0 +1,2 @@
+RAW_BYTE_STRING 7 "br##\"\\n"
+> error[0; 7) token("br##\"\\n") msg(Missing trailing `"` with `#` symbols to terminate the raw byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0047_unstarted_raw_string_at_eof.rs b/crates/ra_syntax/test_data/lexer/err/0047_unstarted_raw_string_at_eof.rs
new file mode 100644
index 00000000000..eddf8d08094
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0047_unstarted_raw_string_at_eof.rs
@@ -0,0 +1 @@
+r##
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0047_unstarted_raw_string_at_eof.txt b/crates/ra_syntax/test_data/lexer/err/0047_unstarted_raw_string_at_eof.txt
new file mode 100644
index 00000000000..00b0468405f
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0047_unstarted_raw_string_at_eof.txt
@@ -0,0 +1,2 @@
+RAW_STRING 3 "r##"
+> error[0; 3) token("r##") msg(Missing `"` symbol after `#` symbols to begin the raw string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0048_unstarted_raw_byte_string_at_eof.rs b/crates/ra_syntax/test_data/lexer/err/0048_unstarted_raw_byte_string_at_eof.rs
new file mode 100644
index 00000000000..7e8cadf4f49
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0048_unstarted_raw_byte_string_at_eof.rs
@@ -0,0 +1 @@
+br##
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0048_unstarted_raw_byte_string_at_eof.txt b/crates/ra_syntax/test_data/lexer/err/0048_unstarted_raw_byte_string_at_eof.txt
new file mode 100644
index 00000000000..33b25e60f8b
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0048_unstarted_raw_byte_string_at_eof.txt
@@ -0,0 +1,2 @@
+RAW_BYTE_STRING 4 "br##"
+> error[0; 4) token("br##") msg(Missing `"` symbol after `#` symbols to begin the raw byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0049_unstarted_raw_string_with_ascii.rs b/crates/ra_syntax/test_data/lexer/err/0049_unstarted_raw_string_with_ascii.rs
new file mode 100644
index 00000000000..534668a9b66
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0049_unstarted_raw_string_with_ascii.rs
@@ -0,0 +1 @@
+r## I lack a quote!
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0049_unstarted_raw_string_with_ascii.txt b/crates/ra_syntax/test_data/lexer/err/0049_unstarted_raw_string_with_ascii.txt
new file mode 100644
index 00000000000..782dfd974f6
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0049_unstarted_raw_string_with_ascii.txt
@@ -0,0 +1,10 @@
+RAW_STRING 4 "r## "
+IDENT 1 "I"
+WHITESPACE 1 " "
+IDENT 4 "lack"
+WHITESPACE 1 " "
+IDENT 1 "a"
+WHITESPACE 1 " "
+IDENT 5 "quote"
+EXCL 1 "!"
+> error[0; 4) token("r## ") msg(Missing `"` symbol after `#` symbols to begin the raw string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0050_unstarted_raw_byte_string_with_ascii.rs b/crates/ra_syntax/test_data/lexer/err/0050_unstarted_raw_byte_string_with_ascii.rs
new file mode 100644
index 00000000000..d9b55455ac4
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0050_unstarted_raw_byte_string_with_ascii.rs
@@ -0,0 +1 @@
+br## I lack a quote!
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0050_unstarted_raw_byte_string_with_ascii.txt b/crates/ra_syntax/test_data/lexer/err/0050_unstarted_raw_byte_string_with_ascii.txt
new file mode 100644
index 00000000000..59c40cd65ac
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0050_unstarted_raw_byte_string_with_ascii.txt
@@ -0,0 +1,10 @@
+RAW_BYTE_STRING 5 "br## "
+IDENT 1 "I"
+WHITESPACE 1 " "
+IDENT 4 "lack"
+WHITESPACE 1 " "
+IDENT 1 "a"
+WHITESPACE 1 " "
+IDENT 5 "quote"
+EXCL 1 "!"
+> error[0; 5) token("br## ") msg(Missing `"` symbol after `#` symbols to begin the raw byte string literal)
diff --git a/crates/ra_syntax/test_data/lexer/err/0051_unclosed_block_comment_at_eof.rs b/crates/ra_syntax/test_data/lexer/err/0051_unclosed_block_comment_at_eof.rs
new file mode 100644
index 00000000000..22e83649f7d
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0051_unclosed_block_comment_at_eof.rs
@@ -0,0 +1 @@
+/*
\ No newline at end of file
diff --git a/crates/ra_syntax/test_data/lexer/err/0051_unclosed_block_comment_at_eof.txt b/crates/ra_syntax/test_data/lexer/err/0051_unclosed_block_comment_at_eof.txt
new file mode 100644
index 00000000000..5d04cdaa4b9
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0051_unclosed_block_comment_at_eof.txt
@@ -0,0 +1,2 @@
+COMMENT 2 "/*"
+> error[0; 2) token("/*") msg(Missing trailing `*/` symbols to terminate the block comment)
diff --git a/crates/ra_syntax/test_data/lexer/err/0052_unclosed_block_comment_with_content.rs b/crates/ra_syntax/test_data/lexer/err/0052_unclosed_block_comment_with_content.rs
new file mode 100644
index 00000000000..c45c2844dbc
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0052_unclosed_block_comment_with_content.rs
@@ -0,0 +1 @@
+/* comment
diff --git a/crates/ra_syntax/test_data/lexer/err/0052_unclosed_block_comment_with_content.txt b/crates/ra_syntax/test_data/lexer/err/0052_unclosed_block_comment_with_content.txt
new file mode 100644
index 00000000000..8c6b678e321
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0052_unclosed_block_comment_with_content.txt
@@ -0,0 +1,2 @@
+COMMENT 11 "/* comment\n"
+> error[0; 11) token("/* comment\n") msg(Missing trailing `*/` symbols to terminate the block comment)
diff --git a/crates/ra_syntax/test_data/lexer/err/0053_unclosed_nested_block_comment_entirely.rs b/crates/ra_syntax/test_data/lexer/err/0053_unclosed_nested_block_comment_entirely.rs
new file mode 100644
index 00000000000..3fcfc96600a
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0053_unclosed_nested_block_comment_entirely.rs
@@ -0,0 +1 @@
+/* /* /*
diff --git a/crates/ra_syntax/test_data/lexer/err/0053_unclosed_nested_block_comment_entirely.txt b/crates/ra_syntax/test_data/lexer/err/0053_unclosed_nested_block_comment_entirely.txt
new file mode 100644
index 00000000000..250de34d9f0
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0053_unclosed_nested_block_comment_entirely.txt
@@ -0,0 +1,2 @@
+COMMENT 9 "/* /* /*\n"
+> error[0; 9) token("/* /* /*\n") msg(Missing trailing `*/` symbols to terminate the block comment)
diff --git a/crates/ra_syntax/test_data/lexer/err/0054_unclosed_nested_block_comment_partially.rs b/crates/ra_syntax/test_data/lexer/err/0054_unclosed_nested_block_comment_partially.rs
new file mode 100644
index 00000000000..26c898f019d
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0054_unclosed_nested_block_comment_partially.rs
@@ -0,0 +1 @@
+/** /*! /* comment */ */
diff --git a/crates/ra_syntax/test_data/lexer/err/0054_unclosed_nested_block_comment_partially.txt b/crates/ra_syntax/test_data/lexer/err/0054_unclosed_nested_block_comment_partially.txt
new file mode 100644
index 00000000000..f97f2a8c76b
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0054_unclosed_nested_block_comment_partially.txt
@@ -0,0 +1,2 @@
+COMMENT 25 "/** /*! /* comment */ */\n"
+> error[0; 25) token("/** /*! /* comment */ */\n") msg(Missing trailing `*/` symbols to terminate the block comment)
diff --git a/crates/ra_syntax/test_data/lexer/err/0055_empty_int.rs b/crates/ra_syntax/test_data/lexer/err/0055_empty_int.rs
new file mode 100644
index 00000000000..aa2a9fdca17
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0055_empty_int.rs
@@ -0,0 +1,17 @@
+0b
+0o
+0x
+
+0b_
+0o_
+0x_
+
+0bnoDigit
+0onoDigit
+0xnoDigit
+
+0xG
+0xg
+
+0x_g
+0x_G
diff --git a/crates/ra_syntax/test_data/lexer/err/0055_empty_int.txt b/crates/ra_syntax/test_data/lexer/err/0055_empty_int.txt
new file mode 100644
index 00000000000..2fe5bd950a5
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0055_empty_int.txt
@@ -0,0 +1,39 @@
+INT_NUMBER 2 "0b"
+WHITESPACE 1 "\n"
+INT_NUMBER 2 "0o"
+WHITESPACE 1 "\n"
+INT_NUMBER 2 "0x"
+WHITESPACE 2 "\n\n"
+INT_NUMBER 3 "0b_"
+WHITESPACE 1 "\n"
+INT_NUMBER 3 "0o_"
+WHITESPACE 1 "\n"
+INT_NUMBER 3 "0x_"
+WHITESPACE 2 "\n\n"
+INT_NUMBER 9 "0bnoDigit"
+WHITESPACE 1 "\n"
+INT_NUMBER 9 "0onoDigit"
+WHITESPACE 1 "\n"
+INT_NUMBER 9 "0xnoDigit"
+WHITESPACE 2 "\n\n"
+INT_NUMBER 3 "0xG"
+WHITESPACE 1 "\n"
+INT_NUMBER 3 "0xg"
+WHITESPACE 2 "\n\n"
+INT_NUMBER 4 "0x_g"
+WHITESPACE 1 "\n"
+INT_NUMBER 4 "0x_G"
+WHITESPACE 1 "\n"
+> error[0; 2) token("0b") msg(Missing digits after the integer base prefix)
+> error[3; 5) token("0o") msg(Missing digits after the integer base prefix)
+> error[6; 8) token("0x") msg(Missing digits after the integer base prefix)
+> error[10; 13) token("0b_") msg(Missing digits after the integer base prefix)
+> error[14; 17) token("0o_") msg(Missing digits after the integer base prefix)
+> error[18; 21) token("0x_") msg(Missing digits after the integer base prefix)
+> error[23; 32) token("0bnoDigit") msg(Missing digits after the integer base prefix)
+> error[33; 42) token("0onoDigit") msg(Missing digits after the integer base prefix)
+> error[43; 52) token("0xnoDigit") msg(Missing digits after the integer base prefix)
+> error[54; 57) token("0xG") msg(Missing digits after the integer base prefix)
+> error[58; 61) token("0xg") msg(Missing digits after the integer base prefix)
+> error[63; 67) token("0x_g") msg(Missing digits after the integer base prefix)
+> error[68; 72) token("0x_G") msg(Missing digits after the integer base prefix)
diff --git a/crates/ra_syntax/test_data/lexer/err/0056_empty_exponent.rs b/crates/ra_syntax/test_data/lexer/err/0056_empty_exponent.rs
new file mode 100644
index 00000000000..286584c887f
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0056_empty_exponent.rs
@@ -0,0 +1,22 @@
+0e
+0E
+
+42e+
+42e-
+42E+
+42E-
+
+42.e+
+42.e-
+42.E+
+42.E-
+
+42.2e+
+42.2e-
+42.2E+
+42.2E-
+
+42.2e+f32
+42.2e-f32
+42.2E+f32
+42.2E-f32
diff --git a/crates/ra_syntax/test_data/lexer/err/0056_empty_exponent.txt b/crates/ra_syntax/test_data/lexer/err/0056_empty_exponent.txt
new file mode 100644
index 00000000000..ab35e20a5ce
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0056_empty_exponent.txt
@@ -0,0 +1,62 @@
+FLOAT_NUMBER 2 "0e"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 2 "0E"
+WHITESPACE 2 "\n\n"
+FLOAT_NUMBER 4 "42e+"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 4 "42e-"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 4 "42E+"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 4 "42E-"
+WHITESPACE 2 "\n\n"
+INT_NUMBER 2 "42"
+DOT 1 "."
+IDENT 1 "e"
+PLUS 1 "+"
+WHITESPACE 1 "\n"
+INT_NUMBER 2 "42"
+DOT 1 "."
+IDENT 1 "e"
+MINUS 1 "-"
+WHITESPACE 1 "\n"
+INT_NUMBER 2 "42"
+DOT 1 "."
+IDENT 1 "E"
+PLUS 1 "+"
+WHITESPACE 1 "\n"
+INT_NUMBER 2 "42"
+DOT 1 "."
+IDENT 1 "E"
+MINUS 1 "-"
+WHITESPACE 2 "\n\n"
+FLOAT_NUMBER 6 "42.2e+"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 6 "42.2e-"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 6 "42.2E+"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 6 "42.2E-"
+WHITESPACE 2 "\n\n"
+FLOAT_NUMBER 9 "42.2e+f32"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 9 "42.2e-f32"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 9 "42.2E+f32"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 9 "42.2E-f32"
+WHITESPACE 1 "\n"
+> error[0; 2) token("0e") msg(Missing digits after the exponent symbol)
+> error[3; 5) token("0E") msg(Missing digits after the exponent symbol)
+> error[7; 11) token("42e+") msg(Missing digits after the exponent symbol)
+> error[12; 16) token("42e-") msg(Missing digits after the exponent symbol)
+> error[17; 21) token("42E+") msg(Missing digits after the exponent symbol)
+> error[22; 26) token("42E-") msg(Missing digits after the exponent symbol)
+> error[53; 59) token("42.2e+") msg(Missing digits after the exponent symbol)
+> error[60; 66) token("42.2e-") msg(Missing digits after the exponent symbol)
+> error[67; 73) token("42.2E+") msg(Missing digits after the exponent symbol)
+> error[74; 80) token("42.2E-") msg(Missing digits after the exponent symbol)
+> error[82; 91) token("42.2e+f32") msg(Missing digits after the exponent symbol)
+> error[92; 101) token("42.2e-f32") msg(Missing digits after the exponent symbol)
+> error[102; 111) token("42.2E+f32") msg(Missing digits after the exponent symbol)
+> error[112; 121) token("42.2E-f32") msg(Missing digits after the exponent symbol)
diff --git a/crates/ra_syntax/test_data/lexer/err/0057_lifetime_strarts_with_a_number.rs b/crates/ra_syntax/test_data/lexer/err/0057_lifetime_strarts_with_a_number.rs
new file mode 100644
index 00000000000..a7698a404a8
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0057_lifetime_strarts_with_a_number.rs
@@ -0,0 +1,2 @@
+'1
+'1lifetime
diff --git a/crates/ra_syntax/test_data/lexer/err/0057_lifetime_strarts_with_a_number.txt b/crates/ra_syntax/test_data/lexer/err/0057_lifetime_strarts_with_a_number.txt
new file mode 100644
index 00000000000..89b38bfacfa
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/err/0057_lifetime_strarts_with_a_number.txt
@@ -0,0 +1,6 @@
+LIFETIME 2 "\'1"
+WHITESPACE 1 "\n"
+LIFETIME 10 "\'1lifetime"
+WHITESPACE 1 "\n"
+> error[0; 2) token("\'1") msg(Lifetime name cannot start with a number)
+> error[3; 13) token("\'1lifetime") msg(Lifetime name cannot start with a number)
diff --git a/crates/ra_syntax/test_data/lexer/0001_hello.rs b/crates/ra_syntax/test_data/lexer/ok/0001_hello.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0001_hello.rs
rename to crates/ra_syntax/test_data/lexer/ok/0001_hello.rs
diff --git a/crates/ra_syntax/test_data/lexer/0001_hello.txt b/crates/ra_syntax/test_data/lexer/ok/0001_hello.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0001_hello.txt
rename to crates/ra_syntax/test_data/lexer/ok/0001_hello.txt
diff --git a/crates/ra_syntax/test_data/lexer/0002_whitespace.rs b/crates/ra_syntax/test_data/lexer/ok/0002_whitespace.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0002_whitespace.rs
rename to crates/ra_syntax/test_data/lexer/ok/0002_whitespace.rs
diff --git a/crates/ra_syntax/test_data/lexer/0002_whitespace.txt b/crates/ra_syntax/test_data/lexer/ok/0002_whitespace.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0002_whitespace.txt
rename to crates/ra_syntax/test_data/lexer/ok/0002_whitespace.txt
diff --git a/crates/ra_syntax/test_data/lexer/0003_ident.rs b/crates/ra_syntax/test_data/lexer/ok/0003_ident.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0003_ident.rs
rename to crates/ra_syntax/test_data/lexer/ok/0003_ident.rs
diff --git a/crates/ra_syntax/test_data/lexer/0003_ident.txt b/crates/ra_syntax/test_data/lexer/ok/0003_ident.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0003_ident.txt
rename to crates/ra_syntax/test_data/lexer/ok/0003_ident.txt
diff --git a/crates/ra_syntax/test_data/lexer/0004_numbers.rs b/crates/ra_syntax/test_data/lexer/ok/0004_numbers.rs
similarity index 73%
rename from crates/ra_syntax/test_data/lexer/0004_numbers.rs
rename to crates/ra_syntax/test_data/lexer/ok/0004_numbers.rs
index dc974b553b0..bc761c235d8 100644
--- a/crates/ra_syntax/test_data/lexer/0004_numbers.rs
+++ b/crates/ra_syntax/test_data/lexer/ok/0004_numbers.rs
@@ -1,4 +1,4 @@
-0 0b 0o 0x 00 0_ 0. 0e 0E 0z
+0 00 0_ 0. 0z
 01790 0b1790 0o1790 0x1790aAbBcCdDeEfF 001279 0_1279 0.1279 0e1279 0E1279
 0..2
 0.foo()
@@ -6,4 +6,4 @@
 0.e+1
 0.0E-2
 0___0.10000____0000e+111__
-1i64 92.0f32 11__s
\ No newline at end of file
+1i64 92.0f32 11__s
diff --git a/crates/ra_syntax/test_data/lexer/0004_numbers.txt b/crates/ra_syntax/test_data/lexer/ok/0004_numbers.txt
similarity index 85%
rename from crates/ra_syntax/test_data/lexer/0004_numbers.txt
rename to crates/ra_syntax/test_data/lexer/ok/0004_numbers.txt
index 7bb89b8ae8e..e19fc5789e3 100644
--- a/crates/ra_syntax/test_data/lexer/0004_numbers.txt
+++ b/crates/ra_syntax/test_data/lexer/ok/0004_numbers.txt
@@ -1,21 +1,11 @@
 INT_NUMBER 1 "0"
 WHITESPACE 1 " "
-INT_NUMBER 2 "0b"
-WHITESPACE 1 " "
-INT_NUMBER 2 "0o"
-WHITESPACE 1 " "
-INT_NUMBER 2 "0x"
-WHITESPACE 1 " "
 INT_NUMBER 2 "00"
 WHITESPACE 1 " "
 INT_NUMBER 2 "0_"
 WHITESPACE 1 " "
 FLOAT_NUMBER 2 "0."
 WHITESPACE 1 " "
-FLOAT_NUMBER 2 "0e"
-WHITESPACE 1 " "
-FLOAT_NUMBER 2 "0E"
-WHITESPACE 1 " "
 INT_NUMBER 2 "0z"
 WHITESPACE 1 "\n"
 INT_NUMBER 5 "01790"
@@ -64,3 +54,4 @@ WHITESPACE 1 " "
 FLOAT_NUMBER 7 "92.0f32"
 WHITESPACE 1 " "
 INT_NUMBER 5 "11__s"
+WHITESPACE 1 "\n"
diff --git a/crates/ra_syntax/test_data/lexer/0005_symbols.rs b/crates/ra_syntax/test_data/lexer/ok/0005_symbols.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0005_symbols.rs
rename to crates/ra_syntax/test_data/lexer/ok/0005_symbols.rs
diff --git a/crates/ra_syntax/test_data/lexer/0005_symbols.txt b/crates/ra_syntax/test_data/lexer/ok/0005_symbols.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0005_symbols.txt
rename to crates/ra_syntax/test_data/lexer/ok/0005_symbols.txt
diff --git a/crates/ra_syntax/test_data/lexer/0006_chars.rs b/crates/ra_syntax/test_data/lexer/ok/0006_chars.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0006_chars.rs
rename to crates/ra_syntax/test_data/lexer/ok/0006_chars.rs
diff --git a/crates/ra_syntax/test_data/lexer/0006_chars.txt b/crates/ra_syntax/test_data/lexer/ok/0006_chars.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0006_chars.txt
rename to crates/ra_syntax/test_data/lexer/ok/0006_chars.txt
diff --git a/crates/ra_syntax/test_data/lexer/0007_lifetimes.rs b/crates/ra_syntax/test_data/lexer/ok/0007_lifetimes.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0007_lifetimes.rs
rename to crates/ra_syntax/test_data/lexer/ok/0007_lifetimes.rs
diff --git a/crates/ra_syntax/test_data/lexer/0007_lifetimes.txt b/crates/ra_syntax/test_data/lexer/ok/0007_lifetimes.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0007_lifetimes.txt
rename to crates/ra_syntax/test_data/lexer/ok/0007_lifetimes.txt
diff --git a/crates/ra_syntax/test_data/lexer/0008_byte_strings.rs b/crates/ra_syntax/test_data/lexer/ok/0008_byte_strings.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0008_byte_strings.rs
rename to crates/ra_syntax/test_data/lexer/ok/0008_byte_strings.rs
diff --git a/crates/ra_syntax/test_data/lexer/0008_byte_strings.txt b/crates/ra_syntax/test_data/lexer/ok/0008_byte_strings.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0008_byte_strings.txt
rename to crates/ra_syntax/test_data/lexer/ok/0008_byte_strings.txt
diff --git a/crates/ra_syntax/test_data/lexer/0009_strings.rs b/crates/ra_syntax/test_data/lexer/ok/0009_strings.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0009_strings.rs
rename to crates/ra_syntax/test_data/lexer/ok/0009_strings.rs
diff --git a/crates/ra_syntax/test_data/lexer/0009_strings.txt b/crates/ra_syntax/test_data/lexer/ok/0009_strings.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0009_strings.txt
rename to crates/ra_syntax/test_data/lexer/ok/0009_strings.txt
diff --git a/crates/ra_syntax/test_data/lexer/ok/0010_single_line_comments.rs b/crates/ra_syntax/test_data/lexer/ok/0010_single_line_comments.rs
new file mode 100644
index 00000000000..4b6653f9cc9
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/ok/0010_single_line_comments.rs
@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+// hello
+//! World
+//!! Inner line doc
+/// Outer line doc
+//// Just a comment
+
+//
+//!
+//!!
+///
+////
diff --git a/crates/ra_syntax/test_data/lexer/ok/0010_single_line_comments.txt b/crates/ra_syntax/test_data/lexer/ok/0010_single_line_comments.txt
new file mode 100644
index 00000000000..98a3818c06c
--- /dev/null
+++ b/crates/ra_syntax/test_data/lexer/ok/0010_single_line_comments.txt
@@ -0,0 +1,22 @@
+SHEBANG 19 "#!/usr/bin/env bash"
+WHITESPACE 1 "\n"
+COMMENT 8 "// hello"
+WHITESPACE 1 "\n"
+COMMENT 9 "//! World"
+WHITESPACE 1 "\n"
+COMMENT 19 "//!! Inner line doc"
+WHITESPACE 1 "\n"
+COMMENT 18 "/// Outer line doc"
+WHITESPACE 1 "\n"
+COMMENT 19 "//// Just a comment"
+WHITESPACE 2 "\n\n"
+COMMENT 2 "//"
+WHITESPACE 1 "\n"
+COMMENT 3 "//!"
+WHITESPACE 1 "\n"
+COMMENT 4 "//!!"
+WHITESPACE 1 "\n"
+COMMENT 3 "///"
+WHITESPACE 1 "\n"
+COMMENT 4 "////"
+WHITESPACE 1 "\n"
diff --git a/crates/ra_syntax/test_data/lexer/0011_keywords.rs b/crates/ra_syntax/test_data/lexer/ok/0011_keywords.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0011_keywords.rs
rename to crates/ra_syntax/test_data/lexer/ok/0011_keywords.rs
diff --git a/crates/ra_syntax/test_data/lexer/0011_keywords.txt b/crates/ra_syntax/test_data/lexer/ok/0011_keywords.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0011_keywords.txt
rename to crates/ra_syntax/test_data/lexer/ok/0011_keywords.txt
diff --git a/crates/ra_syntax/test_data/lexer/00012_block_comment.rs b/crates/ra_syntax/test_data/lexer/ok/0012_block_comment.rs
similarity index 88%
rename from crates/ra_syntax/test_data/lexer/00012_block_comment.rs
rename to crates/ra_syntax/test_data/lexer/ok/0012_block_comment.rs
index 708aac197f2..b880a59d952 100644
--- a/crates/ra_syntax/test_data/lexer/00012_block_comment.rs
+++ b/crates/ra_syntax/test_data/lexer/ok/0012_block_comment.rs
@@ -1,4 +1,3 @@
 /* */
 /**/
 /* /* */ */
-/*
diff --git a/crates/ra_syntax/test_data/lexer/00012_block_comment.txt b/crates/ra_syntax/test_data/lexer/ok/0012_block_comment.txt
similarity index 87%
rename from crates/ra_syntax/test_data/lexer/00012_block_comment.txt
rename to crates/ra_syntax/test_data/lexer/ok/0012_block_comment.txt
index 9958b25187d..2618e287e63 100644
--- a/crates/ra_syntax/test_data/lexer/00012_block_comment.txt
+++ b/crates/ra_syntax/test_data/lexer/ok/0012_block_comment.txt
@@ -4,4 +4,3 @@ COMMENT 4 "/**/"
 WHITESPACE 1 "\n"
 COMMENT 11 "/* /* */ */"
 WHITESPACE 1 "\n"
-COMMENT 3 "/*\n"
diff --git a/crates/ra_syntax/test_data/lexer/0013_raw_strings.rs b/crates/ra_syntax/test_data/lexer/ok/0013_raw_strings.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0013_raw_strings.rs
rename to crates/ra_syntax/test_data/lexer/ok/0013_raw_strings.rs
diff --git a/crates/ra_syntax/test_data/lexer/0013_raw_strings.txt b/crates/ra_syntax/test_data/lexer/ok/0013_raw_strings.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0013_raw_strings.txt
rename to crates/ra_syntax/test_data/lexer/ok/0013_raw_strings.txt
diff --git a/crates/ra_syntax/test_data/lexer/0016_raw_ident.rs b/crates/ra_syntax/test_data/lexer/ok/0014_raw_ident.rs
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0016_raw_ident.rs
rename to crates/ra_syntax/test_data/lexer/ok/0014_raw_ident.rs
diff --git a/crates/ra_syntax/test_data/lexer/0016_raw_ident.txt b/crates/ra_syntax/test_data/lexer/ok/0014_raw_ident.txt
similarity index 100%
rename from crates/ra_syntax/test_data/lexer/0016_raw_ident.txt
rename to crates/ra_syntax/test_data/lexer/ok/0014_raw_ident.txt