Test of references in the presence of shadowing.
-- go.mod --
module example.com
go 1.12
-- a/a.go --
package a
func _() {
x := 123 //@loc(x1, "x"), refs("x", x1, x1ref)
_ = x //@loc(x1ref, "x")
{
x := "hi" //@loc(x2, "x"), refs("x", x2, x2ref)
_ = x //@loc(x2ref, "x")
}
}