Merge #396

396: Fix the `panic` found whilst fuzzing r=matklad,me a=DJMcNab

This occurred when a non-ascii character was used in an ascii escape, for example in the motivating example: `if'\xɿ`, which can be further simplified to `'\xɿ`.

Co-authored-by: DJMcNab <36049421+djmcnab@users.noreply.github.com>

crates/ra_syntax/src/validation/char.rs

@@ -89,12 +89,17 @@ pub(super) fn is_ascii_escape(code: char) -> bool {
 
 fn validate_ascii_code_escape(text: &str, range: TextRange, errors: &mut Vec<SyntaxError>) {
     // An AsciiCodeEscape has 4 chars, example: `\xDD`
-    if text.len() < 4 {
+    if !text.is_ascii() {
+        // TODO: Give a more precise error message (say what the invalid character was)
+        errors.push(SyntaxError::new(AsciiCodeEscapeOutOfRange, range));
+    } else if text.chars().count() < 4 {
         errors.push(SyntaxError::new(TooShortAsciiCodeEscape, range));
     } else {
-        assert!(
-            text.chars().count() == 4,
-            "AsciiCodeEscape cannot be longer than 4 chars"
+        assert_eq!(
+            text.chars().count(),
+            4,
+            "AsciiCodeEscape cannot be longer than 4 chars, but text '{}' is",
+            text,
         );
 
         match u8::from_str_radix(&text[2..], 16) {

crates/ra_syntax/tests/data/parser/fuzz-failures/0003.rs

@@ -0,0 +1 @@
+if'\xɿ