snapshot of https://github.com/mattermost/mattermost.git (master, 2026-09-16; blobs > 131072B omitted)

tools/mattermost-govet/immut/testdata.go

@@ -0,0 +1,74 @@
+//go:build ignore
+
+package pkg
+
+//immut:type T
+
+type T struct {
+	a int
+	b map[string]int
+	c *T
+	d []int
+	e int
+	f int
+	g int
+	h *T3
+	i map[string]*T
+}
+
+func (t *T) Mut() {
+	t.a++
+}
+
+type t2 struct {
+	x *int
+}
+
+type T3 struct {
+	x int
+}
+
+func gen() *T { return nil }
+
+func (t *T) Mut2(t3 *T3) {
+	// all of these should flag, they're fairly direct mutations of T
+	t.a++
+	t.b[""] = 1
+	t.b[""]++
+	t.c.a++
+	t.d[2] = 1
+	x := &t.e
+	*x++
+	y := &t.f
+	if false {
+		y = nil
+	}
+	*y++
+
+	// should flag, because &t.g is immutable
+	z := t2{&t.g}
+	*z.x++
+
+	// should flag, because it's addressed through the immutable T
+	t.h.x++
+
+	// should not flag, because T3 is not immutable
+	t3.x++
+
+	// should flag
+	t.i[""].a++ // FLAGGED
+
+	// should flag, inc is known to mutate its param
+	inc(&t.a)
+
+	// should flag, add is known to mutate its param
+	add(t.b)
+}
+
+func inc(x *int) {
+	*x++
+}
+
+func add(m map[string]int) {
+	m[""] = 0
+}