// options to fix the security problem, and people depend on
	// those old copies of execabs continuing to work.
	// The result is that we have to leave this variable around for the
	// rest of time, a compatibility scar.
	//
	// See https://go.dev/blog/path-security
	// and https://go.dev/issue/43724 for more context.
	lookPathErr error

	// cachedLookExtensions caches the result of calling lookExtensions.