This test verifies the fix for golang/go#78142: a crash in function extraction
when a function with no result types has a return statement.

-- flags --
-ignore_extra_diags

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

go 1.18

-- a.go --
package a

func f() {
    var err error
    if err != nil { //@codeaction("if", "refactor.extract.function", end=ifend, edit=a)
        return err
    } //@loc(ifend, "}")
    println("reachable")
}
-- @a/a.go --
@@ -5,3 +5 @@
-    if err != nil { //@codeaction("if", "refactor.extract.function", end=ifend, edit=a)
-        return err
-    } //@loc(ifend, "}")
+    newFunction(err) //@loc(ifend, "}")
@@ -10 +8,6 @@
+
+func newFunction(err error) {
+	if err != nil { //@codeaction("if", "refactor.extract.function", end=ifend, edit=a)
+		return err
+	}
+}
