cmd/compile: internal compiler error: exporter: unexpected type alias in inlined function body

[skipor]

What version of Go are you using (go version)?

go version go1.10 darwin/amd64

Does this issue reproduce with the latest release?

Yes

What did you do?

package main
type mapAlias = map[interface{}]interface{}
func main() {
	println(mapAlias{})
}
func Foo() {
	println(mapAlias{}) // Works when commented. 
}

https://play.golang.org/p/ukZwewCW0be

What did you expect to see?

The program compiles and print result.

What did you see instead?

<autogenerated>:1:0: internal compiler error: exporter: unexpected type alias mapAlias in inlined function body

[bradfitz]

/cc @mdempsky @griesemer

[griesemer]

Slightly minimized reproducer:

package p

type notExported = struct{}

func Exported() {
	_ = notExported{}
}

[gopherbot]

Change https://golang.org/cl/97719 mentions this issue: cmd/compile: fix unexpected type alias crash