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Parse async fn header.

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This is gated on edition 2018 & the `async_await` feature gate.

The parser will accept `async fn` and `async unsafe fn` as fn
items. Along the same lines as `const fn`, only `async unsafe fn`
is permitted, not `unsafe async fn`.The parser will not accept
`async` functions as trait methods.

To do a little code clean up, four fields of the function type
struct have been merged into the new `FnHeader` struct: constness,
asyncness, unsafety, and ABI.

Also, a small bug in HIR printing is fixed: it previously printed
`const unsafe fn` as `unsafe const fn`, which is grammatically
incorrect.
This commit is contained in:
Without Boats 2018-05-16 22:55:18 -07:00 • committed by Taylor Cramer
parent 4b17d31f11
commit 18ff7d091a
33 changed files with 367 additions and 288 deletions
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13
src/libsyntax/parse/mod.rs
View file

@ -928,12 +928,15 @@ mod tests {
output: ast::FunctionRetTy::Default(sp(15, 15)),
variadic: false
}),
ast::Unsafety::Normal,
Spanned {
span: sp(0,2),
node: ast::Constness::NotConst,
ast::FnHeader {
unsafety: ast::Unsafety::Normal,
asyncness: ast::IsAsync::NotAsync,
constness: Spanned {
span: sp(0,2),
node: ast::Constness::NotConst,
},
abi: Abi::Rust,
},
Abi::Rust,
ast::Generics{
params: Vec::new(),
where_clause: ast::WhereClause {