vfmt: fmt '!(a in/is b)' to 'a !in/is b' (#11335)

vlib/v/fmt/tests/if_not_in_is_expected.vv

@@ -0,0 +1,17 @@
+struct Foo1 {}
+
+struct Foo2 {}
+
+type Foo = Foo1 | Foo2
+
+fn main() {
+	a := [1, 2, 3]
+	if 4 !in a {
+		println('4 not in a')
+	}
+
+	foo := Foo(Foo1{})
+	if foo !is Foo2 {
+		println('foo is not Foo2')
+	}
+}

vlib/v/fmt/tests/if_not_in_is_input.vv

@@ -0,0 +1,17 @@
+struct Foo1{}
+
+struct Foo2{}
+
+type Foo = Foo1 | Foo2
+
+fn main() {
+	a := [1, 2, 3]
+	if !(4 in a) {
+		println('4 not in a')
+	}
+
+	foo := Foo(Foo1{})
+	if !(foo is Foo2) {
+		println('foo is not Foo2')
+	}
+}