promote_consts: fail fast if there are no candidates

rust-lang · Jun 1, 2024 · 9a1a5a2 · 9a1a5a2
1 parent 0bc0f68
commit 9a1a5a2
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/compiler/rustc_mir_transform/src/promote_consts.rs b/compiler/rustc_mir_transform/src/promote_consts.rs
@@ -970,6 +970,11 @@ fn promote_candidates<'tcx>(
     // Visit candidates in reverse, in case they're nested.
     debug!(promote_candidates = ?candidates);
 
+    // eagerly fail fast
+    if candidates.is_empty() {
+        return IndexVec::new();
+    }
+
     let mut promotions = IndexVec::new();
 
     let mut extra_statements = vec![];