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-rw-r--r--compiler/rustc_middle/src/mir/basic_blocks.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/mir/basic_blocks.rs b/compiler/rustc_middle/src/mir/basic_blocks.rs
index 3eb563d7d6e..c32cf5f8253 100644
--- a/compiler/rustc_middle/src/mir/basic_blocks.rs
+++ b/compiler/rustc_middle/src/mir/basic_blocks.rs
@@ -163,6 +163,7 @@ impl<'tcx> graph::Predecessors for BasicBlocks<'tcx> {
     }
 }
 
+// Done here instead of in `structural_impls.rs` because `Cache` is private, as is `basic_blocks`.
 TrivialTypeTraversalImpls! { Cache }
 
 impl<S: Encoder> Encodable<S> for Cache {