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/*
Parenthesized type switch expressions originally
accepted by gofmt must continue to be rewritten
into the correct unparenthesized form.

Only type-switches that didn't declare a variable
in the type switch type assertion and which
contained only "expression-like" (named) types in their
cases were permitted to have their type assertion parenthesized
by go/parser (due to a weak predicate in the parser). All others
were rejected always, either with a syntax error in the
type switch header or in the case.

See also issue 4470.
*/
package p

func f() {
	var x interface{}
	switch x.(type) { // should remain the same
	}
	switch x.(type) { // should become: switch x.(type) {
	}

	switch x.(type) { // should remain the same
	case int:
	}
	switch x.(type) { // should become: switch x.(type) {
	case int:
	}

	switch x.(type) { // should remain the same
	case []int:
	}

	// Parenthesized (x.(type)) in type switches containing cases
	// with unnamed (literal) types were never permitted by gofmt;
	// thus there won't be any code in the wild using this style if
	// the code was gofmt-ed.
	/*
		switch (x.(type)) {
		case []int:
		}
	*/

	switch t := x.(type) { // should remain the same
	default:
		_ = t
	}

	// Parenthesized (x.(type)) in type switches declaring a variable
	// were never permitted by gofmt; thus there won't be any code in
	// the wild using this style if the code was gofmt-ed.
	/*
		switch t := (x.(type)) {
		default:
			_ = t
		}
	*/
}