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typeck: on wrong <expr>.await suggest -> 2018

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This commit is contained in:
Mazdak Farrokhzad 2019-08-14 01:51:41 +02:00
parent 07414417c5
commit 88398a429c
1 changed files with 8 additions and 0 deletions
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8
src/librustc_typeck/check/expr.rs
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@ -1360,6 +1360,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
_ => {}
}
if field.name == kw::Await {
// We know by construction that `<expr>.await` is either on Rust 2015
// or results in `ExprKind::Await`. Suggest switching the edition to 2018.
err.note("to `.await` a `Future`, switch to Rust 2018");
err.help("set `edition = \"2018\"` in `Cargo.toml`");
err.note("for more on editions, read https://doc.rust-lang.org/edition-guide");
}
err.emit();
} else {
type_error_struct!(