Reject 'prefix#lifetime

Author: dtolnay

src/parse.rs

@@ -871,7 +871,10 @@ fn digits(mut input: Cursor) -> Result<Cursor, Reject> {
 fn punct(input: Cursor) -> PResult<Punct> {
     let (rest, ch) = punct_char(input)?;
     if ch == '\'' {
-        if ident_any(rest)?.0.starts_with_char('\'') {
+        let (after_lifetime, _ident) = ident_any(rest)?;
+        if after_lifetime.starts_with_char('\'')
+            || (after_lifetime.starts_with_char('#') && !rest.starts_with("r#"))
+        {
             Err(Reject)
         } else {
             Ok((rest, Punct::new('\'', Spacing::Joint)))

tests/test.rs

@@ -523,7 +523,7 @@ fn lifetimes() {
     "' a".parse::<TokenStream>().unwrap_err();
     "' r#gen".parse::<TokenStream>().unwrap_err();
     "' prefix#lifetime".parse::<TokenStream>().unwrap_err();
-    "'prefix#lifetime".parse::<TokenStream>().unwrap(); // FIXME
+    "'prefix#lifetime".parse::<TokenStream>().unwrap_err();
     "'aa'bb".parse::<TokenStream>().unwrap_err();
     "'r#gen'a".parse::<TokenStream>().unwrap_err();
 }