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Minor improvements.

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Add some comments, and mark one path as unreachable.
This commit is contained in:
Nicholas Nethercote 2022-09-27 09:53:04 +10:00
parent fb4dba0a17
commit 880ebb657a
1 changed files with 5 additions and 3 deletions
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8
compiler/rustc_parse/src/lexer/tokentrees.rs
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@ -8,6 +8,8 @@ use rustc_span::Span;
pub(super) struct TokenTreesReader<'a> {
string_reader: StringReader<'a>,
/// The "next" token, which has been obtained from the `StringReader` but
/// not yet handled by the `TokenTreesReader`.
token: Token,
/// Stack of open delimiters and their spans. Used for error message.
open_braces: Vec<(Delimiter, Span)>,
@ -112,7 +114,7 @@ impl<'a> TokenTreesReader<'a> {
// The span for beginning of the delimited section
let pre_span = self.token.span;
// Parse the open delimiter.
// Move past the open delimiter.
self.open_braces.push((delim, self.token.span));
self.token = self.string_reader.next_token().0;
@ -152,7 +154,7 @@ impl<'a> TokenTreesReader<'a> {
} else {
self.matching_delim_spans.push((open_brace, open_brace_span, close_brace_span));
}
// Parse the closing delimiter.
// Move past the closing delimiter.
self.token = self.string_reader.next_token().0;
}
// Incorrect delimiter.
@ -208,7 +210,7 @@ impl<'a> TokenTreesReader<'a> {
// and an error emitted then. Thus we don't pop from
// self.open_braces here.
}
_ => {}
_ => unreachable!(),
}
TokenTree::Delimited(delim_span, delim, tts)