stack/stack.go
func (c *Call) SrcLine() string {
	return fmt.Sprintf("%s:%d", c.SrcName(), c.Line)
}
func (c *Call) SrcLine() string {
	return fmt.Sprintf("%s:%d", c.SrcName(), c.Line)
}
// SrcLine returns "source.go:line", including only the base file name.