/*
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

// Issue 4468: go/defer calls may not be parenthesized.

package p

type T int

func (t *T) F() T {
	return *t
}

type S struct {
	t T
}

func F() {
	go F            // ERROR "must be function call"
	defer F         // ERROR "must be function call"
	go (F)		// ERROR "must be function call|must not be parenthesized"
	defer (F)	// ERROR "must be function call|must not be parenthesized"

/*
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

expression: PARENTHESIZED
text: (b)

expression: PARENTHESIZED
text: (Companion)

expression: PARENTHESIZED
text: (b.hashCode)

expression: PARENTHESIZED
text: (v as String)

expression: PARENTHESIZED
text: (v as String)

expression: PARENTHESIZED
text: (::callee)

expression: PARENTHESIZED
text: (b::hashCode)