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Clarify parse a little.

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- Name the colon span as `colon_span` to distinguish it from the other
  `span` local variable.
- Just use basic pattern matching, which is easier to read than `map_or`.
This commit is contained in:
Nicholas Nethercote 2024-05-20 09:20:49 +10:00
parent c8844dfdc0
commit 3fc8f8998c
1 changed files with 8 additions and 3 deletions
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11
compiler/rustc_expand/src/mbe/quoted.rs
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@ -62,7 +62,10 @@ pub(super) fn parse(
match tree {
TokenTree::MetaVar(start_sp, ident) if parsing_patterns => {
let span = match trees.next() {
Some(&tokenstream::TokenTree::Token(Token { kind: token::Colon, span }, _)) => {
Some(&tokenstream::TokenTree::Token(
Token { kind: token::Colon, span: colon_span },
_,
)) => {
match trees.next() {
Some(tokenstream::TokenTree::Token(token, _)) => match token.ident() {
Some((fragment, _)) => {
@ -126,10 +129,12 @@ pub(super) fn parse(
}
_ => token.span,
},
tree => tree.map_or(span, tokenstream::TokenTree::span),
Some(tree) => tree.span(),
None => colon_span,
}
}
tree => tree.map_or(start_sp, tokenstream::TokenTree::span),
Some(tree) => tree.span(),
None => start_sp,
};
result.push(TokenTree::MetaVarDecl(span, ident, None));