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-rw-r--r--src/libsyntax/util/map_in_place.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libsyntax/util/map_in_place.rs b/src/libsyntax/util/map_in_place.rs
index 5dd9fc6e8bc..a237a6e6162 100644
--- a/src/libsyntax/util/map_in_place.rs
+++ b/src/libsyntax/util/map_in_place.rs
@@ -1,3 +1,5 @@
+// FIXME(Centril): Move to rustc_data_structures.
+
 use smallvec::{Array, SmallVec};
 use std::ptr;