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-rw-r--r--compiler/rustc_ty_utils/src/layout.rs7
1 files changed, 3 insertions, 4 deletions
diff --git a/compiler/rustc_ty_utils/src/layout.rs b/compiler/rustc_ty_utils/src/layout.rs
index 9774263e4c9..d5222822461 100644
--- a/compiler/rustc_ty_utils/src/layout.rs
+++ b/compiler/rustc_ty_utils/src/layout.rs
@@ -896,10 +896,9 @@ fn variant_info_for_coroutine<'tcx>(
                     variant_size = variant_size.max(offset + field_layout.size);
                     FieldInfo {
                         kind: FieldKind::CoroutineLocal,
-                        name: field_name.unwrap_or(Symbol::intern(&format!(
-                            ".coroutine_field{}",
-                            local.as_usize()
-                        ))),
+                        name: field_name.unwrap_or_else(|| {
+                            Symbol::intern(&format!(".coroutine_field{}", local.as_usize()))
+                        }),
                         offset: offset.bytes(),
                         size: field_layout.size.bytes(),
                         align: field_layout.align.abi.bytes(),