mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Minor improvements.

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
compiler/rustc_parse/src/lexer/tokentrees.rs
View File

@ -8,6 +8,8 @@ use rustc_span::Span;
pub(super) struct TokenTreesReader<'a> { pub(super) struct TokenTreesReader<'a> {
string_reader: StringReader<'a>, string_reader: StringReader<'a>,
/// The "next" token, which has been obtained from the `StringReader` but
/// not yet handled by the `TokenTreesReader`.
token: Token, token: Token,
/// Stack of open delimiters and their spans. Used for error message. /// Stack of open delimiters and their spans. Used for error message.
open_braces: Vec<(Delimiter, Span)>, open_braces: Vec<(Delimiter, Span)>,
@ -112,7 +114,7 @@ impl<'a> TokenTreesReader<'a> {
// The span for beginning of the delimited section // The span for beginning of the delimited section
let pre_span = self.token.span; let pre_span = self.token.span;
// Parse the open delimiter. // Move past the open delimiter.
self.open_braces.push((delim, self.token.span)); self.open_braces.push((delim, self.token.span));
self.token = self.string_reader.next_token().0; self.token = self.string_reader.next_token().0;
@ -152,7 +154,7 @@ impl<'a> TokenTreesReader<'a> {
} else { } else {
self.matching_delim_spans.push((open_brace, open_brace_span, close_brace_span)); 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; self.token = self.string_reader.next_token().0;
} }
// Incorrect delimiter. // Incorrect delimiter.
@ -208,7 +210,7 @@ impl<'a> TokenTreesReader<'a> {
// and an error emitted then. Thus we don't pop from // and an error emitted then. Thus we don't pop from
// self.open_braces here. // self.open_braces here.
} }
_ => {} _ => unreachable!(),
} }
TokenTree::Delimited(delim_span, delim, tts) TokenTree::Delimited(delim_span, delim, tts)