diff --git a/test/fixedbugs/issue33308.go b/test/fixedbugs/issue33308.go
new file mode 100644
index 0000000000000..b0fd6a450ca4e
--- /dev/null
+++ b/test/fixedbugs/issue33308.go
@@ -0,0 +1,12 @@
+// errorcheck
+
+// Copyright 2020 The Go Authors. All rights reserved.  Use of this
+// source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+// Test that the compiler does not crash on a []byte conversion of an
+// untyped expression.
+package p
+
+var v uint
+var x = []byte((1 << v) + 1) // ERROR "cannot convert"