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-rw-r--r--compiler/rustc_abi/src/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_abi/src/lib.rs b/compiler/rustc_abi/src/lib.rs
index ef0c763ac20..0fc1da27b8f 100644
--- a/compiler/rustc_abi/src/lib.rs
+++ b/compiler/rustc_abi/src/lib.rs
@@ -1189,7 +1189,7 @@ impl FieldsShape {
             }
             FieldsShape::Array { stride, count } => {
                 let i = u64::try_from(i).unwrap();
-                assert!(i < count);
+                assert!(i < count, "tried to access field {} of array with {} fields", i, count);
                 stride * i
             }
             FieldsShape::Arbitrary { ref offsets, .. } => offsets[FieldIdx::from_usize(i)],