Add proc macro Literal parse test

src/test/ui/proc-macro/auxiliary/api/mod.rs

@@ -9,12 +9,16 @@
 extern crate proc_macro;
 
 mod cmp;
+mod parse;
 
 use proc_macro::TokenStream;
 
 #[proc_macro]
 pub fn run(input: TokenStream) -> TokenStream {
     assert!(input.is_empty());
+
     cmp::test();
+    parse::test();
+
     TokenStream::new()
 }

src/test/ui/proc-macro/auxiliary/api/parse.rs

@@ -0,0 +1,23 @@
+use proc_macro::Literal;
+
+pub fn test() {
+    test_parse_literal();
+}
+
+fn test_parse_literal() {
+    assert_eq!("1".parse::<Literal>().unwrap().to_string(), "1");
+    assert_eq!("1.0".parse::<Literal>().unwrap().to_string(), "1.0");
+    assert_eq!("'a'".parse::<Literal>().unwrap().to_string(), "'a'");
+    assert_eq!("\"\n\"".parse::<Literal>().unwrap().to_string(), "\"\n\"");
+    assert_eq!("b\"\"".parse::<Literal>().unwrap().to_string(), "b\"\"");
+    assert_eq!("r##\"\"##".parse::<Literal>().unwrap().to_string(), "r##\"\"##");
+    assert_eq!("10ulong".parse::<Literal>().unwrap().to_string(), "10ulong");
+
+    assert!("0 1".parse::<Literal>().is_err());
+    assert!("'a".parse::<Literal>().is_err());
+    assert!(" 0".parse::<Literal>().is_err());
+    assert!("0 ".parse::<Literal>().is_err());
+    assert!("/* comment */0".parse::<Literal>().is_err());
+    assert!("0/* comment */".parse::<Literal>().is_err());
+    assert!("0// comment".parse::<Literal>().is_err());
+}