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Make some matches exhaustive in nonterminal.rs.

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For ones matching more than one or two variants, this is easier to think
about.
This commit is contained in:
Nicholas Nethercote 2023-08-11 09:25:16 +10:00
parent f8a21a5df0
commit 9a3c907bdb
1 changed files with 20 additions and 5 deletions
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25
compiler/rustc_parse/src/parser/nonterminal.rs
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@ -20,7 +20,21 @@ impl<'a> Parser<'a> {
pub fn nonterminal_may_begin_with(kind: NonterminalKind, token: &Token) -> bool {
/// Checks whether the non-terminal may contain a single (non-keyword) identifier.
fn may_be_ident(nt: &token::Nonterminal) -> bool {
!matches!(*nt, NtItem(_) | NtBlock(_) | NtVis(_) | NtLifetime(_))
match nt {
NtStmt(_)
| NtPat(_)
| NtExpr(_)
| NtTy(_)
| NtIdent(..)
| NtLiteral(_) // `true`, `false`
| NtMeta(_)
| NtPath(_) => true,
NtItem(_)
| NtBlock(_)
| NtVis(_)
| NtLifetime(_) => false,
}
}
match kind {
@ -41,10 +55,11 @@ impl<'a> Parser<'a> {
},
NonterminalKind::Block => match &token.kind {
token::OpenDelim(Delimiter::Brace) => true,
token::Interpolated(nt) => !matches!(
**nt,
NtItem(_) | NtPat(_) | NtTy(_) | NtIdent(..) | NtMeta(_) | NtPath(_) | NtVis(_)
),
token::Interpolated(nt) => match **nt {
NtBlock(_) | NtLifetime(_) | NtStmt(_) | NtExpr(_) | NtLiteral(_) => true,
NtItem(_) | NtPat(_) | NtTy(_) | NtIdent(..) | NtMeta(_) | NtPath(_)
| NtVis(_) => false,
},
_ => false,
},
NonterminalKind::Path | NonterminalKind::Meta => match &token.kind {