KT-4348: Array access operator overloading doesn't work with vararg's

#KT-4348 Fixed

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

@@ -2288,17 +2288,28 @@ public class ExpressionCodegen extends JetVisitor<StackValue, StackValue> implem
     }
 
     private int pushMethodArguments(@NotNull ResolvedCall resolvedCall, List<Type> valueParameterTypes) {
+        return pushMethodArguments(resolvedCall, valueParameterTypes, false);
+    }
+
+    private int pushMethodArguments(@NotNull ResolvedCall resolvedCall, List<Type> valueParameterTypes, boolean skipLast) {
         @SuppressWarnings("unchecked")
         List<ResolvedValueArgument> valueArguments = resolvedCall.getValueArgumentsByIndex();
         CallableDescriptor fd = resolvedCall.getResultingDescriptor();
+        List<ValueParameterDescriptor> valueParameters = fd.getValueParameters();
 
-        if (fd.getValueParameters().size() != valueArguments.size()) {
+        if (valueParameters.size() != valueArguments.size()) {
             throw new IllegalStateException();
         }
 
         int mask = 0;
 
-        for (ValueParameterDescriptor valueParameter : fd.getValueParameters()) {
+
+        for (Iterator<ValueParameterDescriptor> iterator = valueParameters.iterator(); iterator.hasNext(); ) {
+            ValueParameterDescriptor valueParameter = iterator.next();
+            if (skipLast && !iterator.hasNext()) {
+                continue;
+            }
+
             ResolvedValueArgument resolvedValueArgument = valueArguments.get(valueParameter.getIndex());
             Type parameterType = valueParameterTypes.get(valueParameter.getIndex());
             if (resolvedValueArgument instanceof ExpressionValueArgument) {
@@ -3380,20 +3391,22 @@ public class ExpressionCodegen extends JetVisitor<StackValue, StackValue> implem
             assert resolvedCall != null : "couldn't find resolved call: " + expression.getText();
 
             Callable callable = resolveToCallable(operationDescriptor, false);
+            Method asmMethod = resolveToCallableMethod(operationDescriptor, false, context).getSignature().getAsmMethod();
+            Type[] argumentTypes = asmMethod.getArgumentTypes();
+
             if (callable instanceof CallableMethod) {
                 genThisAndReceiverFromResolvedCall(receiver, resolvedCall, (CallableMethod) callable);
+                pushMethodArguments(resolvedCall, ((CallableMethod) callable).getValueParameterTypes(), !isGetter);
             }
             else {
                 gen(array, arrayType); // intrinsic method
-            }
 
-            int index = operationDescriptor.getReceiverParameter() != null ? 1 : 0;
+                int index = operationDescriptor.getReceiverParameter() != null ? 1 : 0;
 
-            Method asmMethod = resolveToCallableMethod(operationDescriptor, false, context).getSignature().getAsmMethod();
-            Type[] argumentTypes = asmMethod.getArgumentTypes();
-            for (JetExpression jetExpression : expression.getIndexExpressions()) {
-                gen(jetExpression, argumentTypes[index]);
-                index++;
+                for (JetExpression jetExpression : expression.getIndexExpressions()) {
+                    gen(jetExpression, argumentTypes[index]);
+                    index++;
+                }
             }
 
             Type elementType = isGetter ? asmMethod.getReturnType() : ArrayUtil.getLastElement(argumentTypes);

compiler/testData/codegen/box/arrays/kt4348.kt

@@ -0,0 +1,17 @@
+fun String.get(vararg value: Any) : String {
+    return if (value[0] == 44 && value[1] == "example") "OK" else "fail"
+}
+
+fun Int.get(vararg value: Any) : Int {
+    return if (value[0] == 44 && value[1] == "example") 1 else 0
+}
+fun main(args: Array<String>) {
+    12  [44, "example"]
+}
+
+fun box(): String {
+    if ("foo" [44, "example"] != "OK") return "fail1"
+    if (11 [44, "example"] != 1) return "fail2"
+
+    return "OK"
+}

compiler/tests/org/jetbrains/jet/codegen/generated/BlackBoxCodegenTestGenerated.java

@@ -193,6 +193,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest("compiler/testData/codegen/box/arrays/kt33.kt");
         }
         
+        @TestMetadata("kt4348.kt")
+        public void testKt4348() throws Exception {
+            doTest("compiler/testData/codegen/box/arrays/kt4348.kt");
+        }
+        
         @TestMetadata("kt503.kt")
         public void testKt503() throws Exception {
             doTest("compiler/testData/codegen/box/arrays/kt503.kt");