test: add test case that caused a gofrontend compiler crash

For #47131

Change-Id: Ie2d5a2bd3dceec607544c43e6dc68bd5ea353091
Reviewed-on: https://go-review.googlesource.com/c/go/+/335172
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>

3 files changed, 32 insertions, 0 deletions

diff --git a/test/fixedbugs/issue47131.dir/a.go b/test/fixedbugs/issue47131.dir/a.go
new file mode 100644
index 0000000000..6e798d1d0c
--- /dev/null
+++ b/test/fixedbugs/issue47131.dir/a.go
@@ -0,0 +1,13 @@
+// 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 a
+
+type MyInt int
+
+type MyIntAlias = MyInt
+
+func (mia *MyIntAlias) Get() int {
+	return int(*mia)
+}
diff --git a/test/fixedbugs/issue47131.dir/b.go b/test/fixedbugs/issue47131.dir/b.go
new file mode 100644
index 0000000000..c658127ca9
--- /dev/null
+++ b/test/fixedbugs/issue47131.dir/b.go
@@ -0,0 +1,12 @@
+// 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 b
+
+import "./a"
+
+func F2() int {
+	var mia a.MyIntAlias
+	return mia.Get()
+}
diff --git a/test/fixedbugs/issue47131.go b/test/fixedbugs/issue47131.go
new file mode 100644
index 0000000000..b83fbd7af1
--- /dev/null
+++ b/test/fixedbugs/issue47131.go
@@ -0,0 +1,7 @@
+// compiledir
+
+// 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 ignored