diff --git a/tests/crashes/101962.rs b/tests/crashes/101962.rs
deleted file mode 100644
index b6a78ce053af0..0000000000000
--- a/tests/crashes/101962.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-//@ known-bug: #101962
-
-#![feature(core_intrinsics)]
-
-pub fn wrapping<T: Copy>(a: T, b: T) {
-    let _z = core::intrinsics::wrapping_mul(a, b);
-}
-
-fn main() {
-    wrapping(1,2);
-}
diff --git a/tests/crashes/79409.rs b/tests/crashes/79409.rs
index 98b5f60633627..b5466f55b7d76 100644
--- a/tests/crashes/79409.rs
+++ b/tests/crashes/79409.rs
@@ -1,4 +1,6 @@
 //@ known-bug: #79409
+//@ compile-flags: -Z mir-opt-level=0
+// (Only fails if the use of the place isn't optimized out)
 
 #![feature(extern_types)]
 #![feature(unsized_locals)]