/*

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

}

*/

}