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Propagate mutability from arguments to local bindings in async fn

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This commit is contained in:
Taiki Endo 2019-05-03 13:04:26 +09:00
parent d15fc17381
commit 2fe50bc01b
2 changed files with 14 additions and 6 deletions
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10
src/libsyntax/parse/parser.rs
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@ -8725,9 +8725,9 @@ impl<'a> Parser<'a> {
// Check if this is a ident pattern, if so, we can optimize and avoid adding a
// `let <pat> = __argN;` statement, instead just adding a `let <pat> = <pat>;`
// statement.
let (ident, is_simple_pattern) = match input.pat.node {
PatKind::Ident(_, ident, _) => (ident, true),
_ => (ident, false),
let (binding_mode, ident, is_simple_pattern) = match input.pat.node {
PatKind::Ident(binding_mode, ident, _) => (binding_mode, ident, true),
_ => (BindingMode::ByValue(Mutability::Immutable), ident, false),
};
// Construct an argument representing `__argN: <ty>` to replace the argument of the
@ -8755,9 +8755,7 @@ impl<'a> Parser<'a> {
let move_local = Local {
pat: P(Pat {
id,
node: PatKind::Ident(
BindingMode::ByValue(Mutability::Immutable), ident, None,
),
node: PatKind::Ident(binding_mode, ident, None),
span,
}),
// We explicitly do not specify the type for this statement. When the user's