// support additional syntax in the future, such as open and half-open
				// intervals. Those can't be supported now, because they break the
				// go.mod parser, even in lax mode.
				return
			}
		}
		if len(args) > 0 && strict {
			// In the future, there may be additional information after the version.
			errorf("unexpected token after version: %q", args[0])
			return
		}

	// stack. And through a combination of skip counts and limits, we can do all
	// of the steps we need with a single traceback printer implementation.
	//
	// We could be more lax about exactly how many frames we print, for example
	// always stopping and resuming on physical frame boundaries, or at least
	// cgo expansion boundaries. It's not clear that's much simpler.
	flags |= unwindPrintErrors