This test verifies the fix for golang/go#67905: Extract variable from type
switch produces invalid code

-- go.mod --
module mod.test/extract

go 1.18

-- extract_switch.go --
package extract

import (
	"io"
)

func f() io.Reader

func main() {
	switch r := f().(type) { //@codeaction("f()", "refactor.extract.variable", edit=type_switch_func_call)
	default:
		_ = r
	}
}

-- @type_switch_func_call/extract_switch.go --
@@ -10 +10,2 @@
-	switch r := f().(type) { //@codeaction("f()", "refactor.extract.variable", edit=type_switch_func_call)
+	x := f()
+	switch r := x.(type) { //@codeaction("f()", "refactor.extract.variable", edit=type_switch_func_call)
