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-rw-r--r--src/librustc_data_structures/lib.rs1
-rw-r--r--src/librustc_mir/lib.rs1
2 files changed, 2 insertions, 0 deletions
diff --git a/src/librustc_data_structures/lib.rs b/src/librustc_data_structures/lib.rs
index 2e8d9725234..1b62983388f 100644
--- a/src/librustc_data_structures/lib.rs
+++ b/src/librustc_data_structures/lib.rs
@@ -21,6 +21,7 @@
       html_root_url = "https://doc.rust-lang.org/nightly/")]
 
 #![feature(in_band_lifetimes)]
+#![feature(impl_header_lifetime_elision)]
 #![feature(unboxed_closures)]
 #![feature(fn_traits)]
 #![feature(unsize)]
diff --git a/src/librustc_mir/lib.rs b/src/librustc_mir/lib.rs
index 617efed31d9..44a73139906 100644
--- a/src/librustc_mir/lib.rs
+++ b/src/librustc_mir/lib.rs
@@ -17,6 +17,7 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![cfg_attr(not(stage0), feature(nll))]
 #![feature(infer_outlives_requirements)]
 #![feature(in_band_lifetimes)]
+#![feature(impl_header_lifetime_elision)]
 #![feature(slice_patterns)]
 #![feature(slice_sort_by_cached_key)]
 #![feature(box_patterns)]