if f := ctxt.SplitPathList; f != nil {
		return f(s)
	}
	return filepath.SplitList(s)
}

// isAbsPath calls ctxt.IsAbsPath (if not nil) or else filepath.IsAbs.
func (ctxt *Context) isAbsPath(path string) bool {
	if f := ctxt.IsAbsPath; f != nil {
		return f(path)
	}
	return filepath.IsAbs(path)
}

// isDir calls ctxt.IsDir (if not nil) or else uses fsys.Stat.

	if f := ctxt.SplitPathList; f != nil {
		return f(s)
	}
	return filepath.SplitList(s)
}

// isAbsPath calls ctxt.IsAbsPath (if not nil) or else filepath.IsAbs.
func (ctxt *Context) isAbsPath(path string) bool {
	if f := ctxt.IsAbsPath; f != nil {
		return f(path)
	}
	return filepath.IsAbs(path)
}

// isDir calls ctxt.IsDir (if not nil) or else uses os.Stat.

		{"Context.GOOS", Field, 0},
		{"Context.GOPATH", Field, 0},
		{"Context.GOROOT", Field, 0},
		{"Context.HasSubdir", Field, 0},
		{"Context.InstallSuffix", Field, 1},
		{"Context.IsAbsPath", Field, 0},
		{"Context.IsDir", Field, 0},
		{"Context.JoinPath", Field, 0},
		{"Context.OpenFile", Field, 0},
		{"Context.ReadDir", Field, 0},
		{"Context.ReleaseTags", Field, 1},