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/usr/share/gocode/src/github.com/mattn/go-isatty/isatty_others.go is in golang-github-mattn-go-isatty-dev 0.0.3-4.

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// +build !windows
// +build !appengine

package isatty

// IsCygwinTerminal() return true if the file descriptor is a cygwin or msys2
// terminal. This is also always false on this environment.
func IsCygwinTerminal(fd uintptr) bool {
	return false
}