// format's package so that, to decode a PNG image, it suffices to have
//
//	import _ "image/png"
//
// in a program's main package. The _ means to import a package purely for its
// initialization side effects.
//
// See "The Go image package" for more details:
// https://golang.org/doc/articles/image_package.html
//
// # Security Considerations
//

	{"/a/b/c/d", "/a/b/", "../.."},
	{"/a/b/c/d/", "/a/b", "../.."},
	{"/a/b/c/d/", "/a/b/", "../.."},
	{"/../../a/b", "/../../a/b/c/d", "c/d"},
	{".", "a/b", "a/b"},
	{".", "..", ".."},

	// can't do purely lexically
	{"..", ".", "err"},
	{"..", "a", "err"},
	{"../..", "..", "err"},
	{"a", "/a", "err"},
	{"/a", "a", "err"},
}

var winreltests = []RelTests{
	{`C:a\b\c`, `C:a/b/d`, `..\d`},

// [Regexp.FindSubmatchIndex].
//
// In the template, a variable is denoted by a substring of the form
// $name or ${name}, where name is a non-empty sequence of letters,
// digits, and underscores. A purely numeric name like $1 refers to
// the submatch with the corresponding index; other names refer to
// capturing parentheses named with the (?P<name>...) syntax. A