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Specialization for async traits

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This commit is contained in:
Arnaud 2021-02-15 18:11:10 +01:00
parent 00d5a9563a
commit 95d239da99
5 changed files with 116 additions and 0 deletions
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28
crates/parser/src/grammar/items.rs
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@ -83,6 +83,7 @@ pub(super) fn item_or_macro(p: &mut Parser, stop_on_r_curly: bool) {
}
}
/// Try to parse an item, completing `m` in case of success.
pub(super) fn maybe_item(p: &mut Parser, m: Marker) -> Result<(), Marker> {
// test_err pub_expr
// fn foo() { pub 92; }
@ -143,6 +144,33 @@ pub(super) fn maybe_item(p: &mut Parser, m: Marker) -> Result<(), Marker> {
has_mods = true;
}
}
T![async] => {
// test default_async_fn
// impl T for Foo {
// default async fn foo() {}
// }
// test default_async_unsafe_fn
// impl T for Foo {
// default async unsafe fn foo() {}
// }
let mut maybe_fn = p.nth(2);
let is_unsafe = if matches!(maybe_fn, T![unsafe]) {
maybe_fn = p.nth(3);
true
} else {
false
};
if matches!(maybe_fn, T![fn]) {
p.bump_remap(T![default]);
p.bump(T![async]);
if is_unsafe {
p.bump(T![unsafe])
}
has_mods = true;
}
}
_ => (),
}
}