bjoernager/rust
bjoernager/rust
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Introduce DotDotPos.

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This shrinks `hir::Pat` from 88 to 72 bytes.
This commit is contained in:
Nicholas Nethercote 2022-09-01 13:29:57 +10:00
parent 4314615ff8
commit e67f39f8bc
15 changed files with 85 additions and 47 deletions
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11
compiler/rustc_ast_lowering/src/expr.rs
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@ -1128,8 +1128,11 @@ impl<'hir> LoweringContext<'_, 'hir> {
&mut ImplTraitContext::Disallowed(ImplTraitPosition::Path),
);
// Destructure like a tuple struct.
let tuple_struct_pat =
hir::PatKind::TupleStruct(qpath, pats, rest.map(|r| r.0));
let tuple_struct_pat = hir::PatKind::TupleStruct(
qpath,
pats,
hir::DotDotPos::new(rest.map(|r| r.0)),
);
return self.pat_without_dbm(lhs.span, tuple_struct_pat);
}
}
@ -1184,13 +1187,13 @@ impl<'hir> LoweringContext<'_, 'hir> {
ExprKind::Tup(elements) => {
let (pats, rest) =
self.destructure_sequence(elements, "tuple", eq_sign_span, assignments);
let tuple_pat = hir::PatKind::Tuple(pats, rest.map(|r| r.0));
let tuple_pat = hir::PatKind::Tuple(pats, hir::DotDotPos::new(rest.map(|r| r.0)));
return self.pat_without_dbm(lhs.span, tuple_pat);
}
ExprKind::Paren(e) => {
// We special-case `(..)` for consistency with patterns.
if let ExprKind::Range(None, None, RangeLimits::HalfOpen) = e.kind {
let tuple_pat = hir::PatKind::Tuple(&[], Some(0));
let tuple_pat = hir::PatKind::Tuple(&[], hir::DotDotPos::new(Some(0)));
return self.pat_without_dbm(lhs.span, tuple_pat);
} else {
return self.destructure_assign_mut(e, eq_sign_span, assignments);