1 files changed, 1 insertions, 3 deletions
diff --git a/src/librustc_mir/lints.rs b/src/librustc_mir/lints.rs
index da3fead1f9d..158b730b9bd 100644
--- a/src/librustc_mir/lints.rs
+++ b/src/librustc_mir/lints.rs
@@ -72,13 +72,11 @@ fn check_fn_for_unconditional_recursion(
     let caller_substs = &InternalSubsts::identity_for_item(tcx, def_id)[..trait_substs_count];
 
     while let Some(bb) = reachable_without_self_call_queue.pop() {
-        if visited.contains(bb) {
+        if !visited.insert(bb) {
             //already done
             continue;
         }
 
-        visited.insert(bb);
-
         let block = &basic_blocks[bb];
 
         if let Some(ref terminator) = block.terminator {