// expected: "math" imported and not used
//
// Go requires an imported package to be referred to in the file that imports
// it: a package imported for its side effects only needs the blank identifier.
// go/types rejects this on the legacy side; stage4 linked the import and said
// nothing, so a file could import a package it never mentioned and only the
// legacy compiler would object.
//
// The rule is per file, not per package - another file importing "math" and
// using it does not excuse this one - and the message names the alias when the
// import has one ("math" imported as m and not used).
package main

import "math"

func main() {
	println(int32(1))
}