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-rw-r--r--src/librustc_data_structures/bitvec.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc_data_structures/bitvec.rs b/src/librustc_data_structures/bitvec.rs
index 7331016c2d2..e8f9a672087 100644
--- a/src/librustc_data_structures/bitvec.rs
+++ b/src/librustc_data_structures/bitvec.rs
@@ -138,7 +138,7 @@ impl FromIterator<bool> for BitVector {
 /// A "bit matrix" is basically a matrix of booleans represented as
 /// one gigantic bitvector. In other words, it is as if you have
 /// `rows` bitvectors, each of length `columns`.
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct BitMatrix {
     columns: usize,
     vector: Vec<u64>,