cmd/gc: generate type alg after calling dowidth.

Previously it might happen before calling dowidth and
result in a compiler crash.

Fixes issue 8060.

LGTM=dvyukov, rsc
R=golang-codereviews, dvyukov, gobot, rsc
CC=golang-codereviews
https://codereview.appspot.com/110980044

3 files changed, 29 insertions, 0 deletions

diff --git a/test/fixedbugs/issue8060.dir/a.go b/test/fixedbugs/issue8060.dir/a.go
new file mode 100644
index 000000000..22ba69ee1
--- /dev/null
+++ b/test/fixedbugs/issue8060.dir/a.go
@@ -0,0 +1,7 @@
+// Copyright 2014 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
+
+var A = []*[2][1]float64{}
diff --git a/test/fixedbugs/issue8060.dir/b.go b/test/fixedbugs/issue8060.dir/b.go
new file mode 100644
index 000000000..85fb6ec7d
--- /dev/null
+++ b/test/fixedbugs/issue8060.dir/b.go
@@ -0,0 +1,13 @@
+// Copyright 2014 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"
+
+var X = a.A
+
+func b() {
+	_ = [3][1]float64{}
+}
diff --git a/test/fixedbugs/issue8060.go b/test/fixedbugs/issue8060.go
new file mode 100644
index 000000000..ec52659e6
--- /dev/null
+++ b/test/fixedbugs/issue8060.go
@@ -0,0 +1,9 @@
+// compiledir
+
+// Copyright 2014 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.
+
+// Issue 8060: internal compiler error.
+
+package ignored