cmd/compile: mark ODYNAMICDOTTYPE as an expression that can panic

Fixes #47924

Change-Id: I4325b3c4ed9d369d9ea778478285436e1b2ab08a
Reviewed-on: https://go-review.googlesource.com/c/go/+/344571
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/test/typeparam/issue47924.go b/test/typeparam/issue47924.go
new file mode 100644
index 0000000000..1d1bab3bf9
--- /dev/null
+++ b/test/typeparam/issue47924.go
@@ -0,0 +1,15 @@
+// compile -G=3
+
+// Copyright 2021 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.
+
+package p
+
+type Cache[K any] struct{}
+
+func (c Cache[K]) foo(x interface{}, f func(K) bool) {
+	f(x.(K))
+}
+
+var _ Cache[int]