bjoernager/rust
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Don't make pattern nonterminals match statement nonterminals

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This commit is contained in:
Michael Goulet 2024-01-22 02:29:21 +00:00
parent 22572d0994
commit c61f85b6dd
5 changed files with 65 additions and 42 deletions
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20
compiler/rustc_parse/src/parser/nonterminal.rs
View file

@ -86,25 +86,7 @@ impl<'a> Parser<'a> {
token::Interpolated(nt) => may_be_ident(nt),
_ => false,
},
NonterminalKind::Pat(pat_kind) => match &token.kind {
// box, ref, mut, and other identifiers (can stricten)
token::Ident(..) | token::NtIdent(..) |
token::OpenDelim(Delimiter::Parenthesis) | // tuple pattern
token::OpenDelim(Delimiter::Bracket) | // slice pattern
token::BinOp(token::And) | // reference
token::BinOp(token::Minus) | // negative literal
token::AndAnd | // double reference
token::Literal(_) | // literal
token::DotDot | // range pattern (future compat)
token::DotDotDot | // range pattern (future compat)
token::PathSep | // path
token::Lt | // path (UFCS constant)
token::BinOp(token::Shl) => true, // path (double UFCS)
// leading vert `|` or-pattern
token::BinOp(token::Or) => matches!(pat_kind, PatWithOr),
token::Interpolated(nt) => may_be_ident(nt),
_ => false,
},
NonterminalKind::Pat(pat_kind) => token.can_begin_pattern(pat_kind),
NonterminalKind::Lifetime => match &token.kind {
token::Lifetime(_) | token::NtLifetime(..) => true,
_ => false,

6
compiler/rustc_parse/src/parser/pat.rs
View file

@ -444,7 +444,11 @@ impl<'a> Parser<'a> {
let mut lo = self.token.span;
if self.token.is_keyword(kw::Let) && self.look_ahead(1, |tok| tok.can_begin_pattern()) {
if self.token.is_keyword(kw::Let)
&& self.look_ahead(1, |tok| {
tok.can_begin_pattern(token::NtPatKind::PatParam { inferred: false })
})
{
self.bump();
self.dcx().emit_err(RemoveLet { span: lo });
lo = self.token.span;

5
compiler/rustc_parse/src/parser/path.rs
View file

@ -378,7 +378,10 @@ impl<'a> Parser<'a> {
if self.may_recover()
&& prev_token_before_parsing == token::PathSep
&& (style == PathStyle::Expr && self.token.can_begin_expr()
|| style == PathStyle::Pat && self.token.can_begin_pattern())
|| style == PathStyle::Pat
&& self.token.can_begin_pattern(token::NtPatKind::PatParam {
inferred: false,
}))
{
snapshot = Some(self.create_snapshot_for_diagnostic());
}