Auto merge of #3394 - RalfJung:rustup, r=RalfJung

Rustup

1 files changed, 33 insertions, 0 deletions

diff --git a/tests/coverage/let_else_loop.rs b/tests/coverage/let_else_loop.rs
new file mode 100644
index 00000000000..12e0aeabcab
--- /dev/null
+++ b/tests/coverage/let_else_loop.rs
@@ -0,0 +1,33 @@
+#![feature(coverage_attribute)]
+//@ edition: 2021
+
+// Regression test for <https://github.com/rust-lang/rust/issues/122738>.
+// These code patterns should not trigger an ICE when allocating a physical
+// counter to a node and also one of its in-edges, because that is allowed
+// when the node contains a tight loop to itself.
+
+fn loopy(cond: bool) {
+    let true = cond else { loop {} };
+}
+
+// Variant that also has `loop {}` on the success path.
+// This isn't needed to catch the original ICE, but might help detect regressions.
+fn _loop_either_way(cond: bool) {
+    let true = cond else { loop {} };
+    loop {}
+}
+
+// Variant using regular `if` instead of let-else.
+// This doesn't trigger the original ICE, but might help detect regressions.
+fn _if(cond: bool) {
+    if cond {
+        loop {}
+    } else {
+        loop {}
+    }
+}
+
+#[coverage(off)]
+fn main() {
+    loopy(true);
+}