warning: `try` is a keyword in the 2018 edition
  --> $DIR/try-macro.rs:12:5
   |
LL |     try!(x);
   |     ^^^ help: you can use a raw identifier to stay compatible: `r#try`
   |
note: lint level defined here
  --> $DIR/try-macro.rs:6:9
   |
LL | #![warn(rust_2018_compatibility)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^
   = note: #[warn(keyword_idents)] implied by #[warn(rust_2018_compatibility)]
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
   = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716>