stack/stack.go
func (c *Call) PkgSrc() string {
	return filepath.Join(filepath.Base(filepath.Dir(c.SrcPath)), c.SrcName())
}
func (c *Call) PkgSrc() string {
	return filepath.Join(filepath.Base(filepath.Dir(c.SrcPath)), c.SrcName())
}
// PkgSrc is one directory plus the file name of the source file.