bjoernager/rust
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Improve comments for reserved prefixes.

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Co-authored-by: Niko Matsakis <niko@alum.mit.edu>
This commit is contained in:
Mara Bos 2021-06-14 16:46:46 +00:00 • committed by lrh2000
parent 3b18e215a3
commit 6adce70a58
2 changed files with 11 additions and 3 deletions
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9
compiler/rustc_lexer/src/lib.rs
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@ -66,7 +66,12 @@ pub enum TokenKind {
Ident,
/// "r#ident"
RawIdent,
/// `foo#`, `foo'`, `foo"`. Note the tailer is not included.
/// An unknown prefix like `foo#`, `foo'`, `foo"`. Note that only the
/// prefix (`foo`) is included in the token, not the separator (which is
/// lexed as its own distinct token). In Rust 2021 and later, reserved
/// prefixes are reported as errors; in earlier editions, they result in a
/// (allowed by default) lint, and are treated as regular identifier
/// tokens.
BadPrefix,
/// "12_u8", "1.0e-40", "b"123"". See `LiteralKind` for more details.
Literal { kind: LiteralKind, suffix_start: usize },
@ -493,7 +498,7 @@ impl Cursor<'_> {
debug_assert!(is_id_start(self.prev()));
// Start is already eaten, eat the rest of identifier.
self.eat_while(is_id_continue);
// Good prefixes must have been handled eariler. So if
// Good prefixes must have been handled earlier. So if
// we see a prefix here, it is definitely a bad prefix.
match self.first() {
'#' | '"' | '\'' => BadPrefix,