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`
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
   = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716>
note: the lint level is defined here
  --> $DIR/try-macro.rs:6:9
   |
LL | #![warn(rust_2018_compatibility)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^
   = note: `#[warn(keyword_idents)]` implied by `#[warn(rust_2018_compatibility)]`

warning: 1 warning emitted