649d0a9525
parser: more friendly hints for handling `async move` in the 2015 edition Fixes #114219 An error is emitted when encountering an async move block in the 2015 edition. Another appropriate location to raise an error is after executing [let path = this.parse_path(PathStyle::Expr)?](https://github.com/rust-lang/rust/blob/master/compiler/rustc_parse/src/parser/stmt.rs#L152), but it seems somewhat premature to invoke `create_err` at that stage.