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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 7b6abdf1ea9..2e51753ede6 100644
--- a/compiler/rustc_abi/src/lib.rs
+++ b/compiler/rustc_abi/src/lib.rs
@@ -638,7 +638,7 @@ impl AddAssign for Size {
 #[cfg(feature = "nightly")]
 impl Step for Size {
     #[inline]
-    fn steps_between(start: &Self, end: &Self) -> Option<usize> {
+    fn steps_between(start: &Self, end: &Self) -> (usize, Option<usize>) {
         u64::steps_between(&start.bytes(), &end.bytes())
     }