--- /dev/null
+// +build ignore
+
+package main
+
+// Test of maps.
+
+var a, b, c int
+
+func maps1() {
+ m1 := map[*int]*int{&a: &b} // @line m1m1
+ m2 := make(map[*int]*int) // @line m1m2
+ m2[&b] = &a
+
+ print(m1[nil]) // @pointsto main.b | main.c
+ print(m2[nil]) // @pointsto main.a
+
+ print(m1) // @pointsto makemap@m1m1:21
+ print(m2) // @pointsto makemap@m1m2:12
+
+ m1[&b] = &c
+
+ for k, v := range m1 {
+ print(k) // @pointsto main.a | main.b
+ print(v) // @pointsto main.b | main.c
+ }
+
+ for k, v := range m2 {
+ print(k) // @pointsto main.b
+ print(v) // @pointsto main.a
+ }
+
+ // Lookup doesn't create any aliases.
+ print(m2[&c]) // @pointsto main.a
+ if _, ok := m2[&a]; ok {
+ print(m2[&c]) // @pointsto main.a
+ }
+}
+
+func maps2() {
+ m1 := map[*int]*int{&a: &b}
+ m2 := map[*int]*int{&b: &c}
+ _ = []map[*int]*int{m1, m2} // (no spurious merging of m1, m2)
+
+ print(m1[nil]) // @pointsto main.b
+ print(m2[nil]) // @pointsto main.c
+}
+
+var g int
+
+func maps3() {
+ // Regression test for a constraint generation bug for map range
+ // loops in which the key is unused: the (ok, k, v) tuple
+ // returned by ssa.Next may have type 'invalid' for the k and/or
+ // v components, so copying the map key or value may cause
+ // miswiring if the key has >1 components. In the worst case,
+ // this causes a crash. The test below used to report that
+ // pts(v) includes not just main.g but new(float64) too, which
+ // is ill-typed.
+
+ // sizeof(K) > 1, abstractly
+ type K struct{ a, b *float64 }
+ k := K{new(float64), nil}
+ m := map[K]*int{k: &g}
+
+ for _, v := range m {
+ print(v) // @pointsto main.g
+ }
+}
+
+func main() {
+ maps1()
+ maps2()
+ maps3()
+}