KT-950 wrong call to array-like setter with non-void return type

compiler/backend/src/org/jetbrains/jet/codegen/StackValue.java

@@ -531,8 +531,17 @@ public abstract class StackValue {
             if (setter == null) {
                 throw new UnsupportedOperationException("no setter specified");
             }
-            if(setter instanceof CallableMethod)
+            if(setter instanceof CallableMethod) {
-                ((CallableMethod)setter).invoke(v);
+                CallableMethod method = (CallableMethod) setter;
+                method.invoke(v);
+                Type returnType = method.getSignature().getAsmMethod().getReturnType();
+                if(returnType != Type.VOID_TYPE) {
+                    if(returnType.getSize() == 2)
+                        v.pop2();
+                    else
+                        v.pop();
+                }
+            }
             else
                 ((IntrinsicMethod)setter).generate(codegen, v, null, null, null, null);
         }

compiler/testData/codegen/regressions/kt950.jet

@@ -0,0 +1,9 @@
+import java.util.*
+
+fun <K, V> Map<K, V>.set(k : K, v : V) = put(k, v)
+
+fun box() : String {
+    val map = HashMap<String,String>()
+    map["239"] = "932"
+    return if(map["239"] == "932") "OK" else "fail"
+}

compiler/tests/org/jetbrains/jet/codegen/ArrayGenTest.java

@@ -286,6 +286,10 @@ public class ArrayGenTest extends CodegenTestCase {
 //        System.out.println(generateToText());
     }
 
+    public void testKt950() {
+        blackBoxFile("regressions/kt950.jet");
+    }
+
     public void testKt594() throws Exception {
         loadFile("regressions/kt594.jet");
 //        System.out.println(generateToText());