1 files changed, 14 insertions, 1 deletions
diff --git a/compiler/rustc_mir_dataflow/src/framework/fmt.rs b/compiler/rustc_mir_dataflow/src/framework/fmt.rs
index 1d1553bbbd9..99735673f4d 100644
--- a/compiler/rustc_mir_dataflow/src/framework/fmt.rs
+++ b/compiler/rustc_mir_dataflow/src/framework/fmt.rs
@@ -1,7 +1,7 @@
 //! Custom formatting traits used when outputting Graphviz diagrams with the results of a dataflow
 //! analysis.
 
-use rustc_index::bit_set::{BitSet, HybridBitSet};
+use rustc_index::bit_set::{BitSet, ChunkedBitSet, HybridBitSet};
 use rustc_index::vec::Idx;
 use std::fmt;
 
@@ -133,6 +133,19 @@ where
     }
 }
 
+impl<T, C> DebugWithContext<C> for ChunkedBitSet<T>
+where
+    T: Idx + DebugWithContext<C>,
+{
+    fn fmt_with(&self, _ctxt: &C, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        unimplemented!("implement when/if needed");
+    }
+
+    fn fmt_diff_with(&self, _old: &Self, _ctxt: &C, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        unimplemented!("implement when/if needed");
+    }
+}
+
 impl<T, C> DebugWithContext<C> for &'_ T
 where
     T: DebugWithContext<C>,