Added test which should be enabled after fixing bug in front-end.

compiler/testData/codegen/boxWithJava/samAdapters/operators/augmentedAssignmentAndSquareBrackets.kt

@@ -0,0 +1,30 @@
+fun box(): String {
+    var c = Container()
+    var indexAccess = 0
+
+    // TODO uncomment when KT-3723 is fixed
+
+    //var v1 = "FAIL"
+    //c[{ indexAccess++ }] += { v1 = "OK" }
+    //if (v1 != "OK") return "plus: $v1"
+    //
+    //var v2 = "FAIL"
+    //c[{ indexAccess++ }] -= { v2 = "OK" }
+    //if (v2 != "OK") return "minus: $v2"
+    //
+    //var v3 = "FAIL"
+    //c[{ indexAccess++ }] *= { v3 = "OK" }
+    //if (v3 != "OK") return "times: $v3"
+    //
+    //var v4 = "FAIL"
+    //c[{ indexAccess++ }] /= { v4 = "OK" }
+    //if (v4 != "OK") return "div: $v4"
+    //
+    //var v5 = "FAIL"
+    //c[{ indexAccess++ }] %= { v5 = "OK" }
+    //if (v5 != "OK") return "mod: $v5"
+    //
+    //if (indexAccess != 10) return indexAccess
+
+    return "OK"
+}