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+warning: `try` is a keyword in the 2018 edition
+ --> $DIR/lint_pre_expansion_extern_module_aux.rs:3:8
+ |
+LL | pub fn try() {}
+ | ^^^ help: you can use a raw identifier to stay compatible: `r#try`
+ |
+ = note: `-W keyword-idents` implied by `-W rust-2018-compatibility`
+ = 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>
+
+warning: 1 warning emitted
+