return dir
		}
	}
	return t.TempDir()
}

// TestTestSupport does a basic verification of the functionality in
// ProcessCoverTestDir (doing this here as opposed to
// relying on other test paths will provide a better signal when
// running "go test -cover" for this package).
func TestTestSupport(t *testing.T) {
	if !goexperiment.CoverageRedesign {
		return
	}
	if testing.CoverMode() == "" {