go/types: repeated 'declared but not used' errors in closures #22524
Description
$ cat /tmp/x.go
package p
func f() {
_ = func() {
var x int
}
}
$ go get golang.org/x/tools/cmd/gotype
$ gotype /tmp/x.go
x.go:5:7: x declared but not used
x.go:5:7: x declared but not used
$
The error should be reported by go/types only once.
/cc @griesemer