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-rw-r--r--compiler/rustc_span/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index 0301b364591..39b7b36b853 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -21,6 +21,7 @@
 #![feature(nll)]
 #![feature(min_specialization)]
 #![feature(thread_local_const_init)]
+#![feature(trusted_step)]
 
 #[macro_use]
 extern crate rustc_macros;