KT-2739 Error type inferred for hashSet(Pair, Pair, Pair)

#KT-2739 Fixed

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/CallResolver.java

@@ -798,9 +798,12 @@ public class CallResolver {
         JetType effectiveExpectedType = getEffectiveExpectedType(valueParameterDescriptor, valueArgument);
         TemporaryBindingTrace traceForUnknown = TemporaryBindingTrace.create(context.trace);
         JetExpression argumentExpression = valueArgument.getArgumentExpression();
-        JetType type = argumentExpression != null ? expressionTypingServices.getType(
-                context.scope, argumentExpression, substitutor.substitute(valueParameterDescriptor.getType(), Variance.INVARIANT),
-                context.dataFlowInfo, traceForUnknown) : null;
+        JetType type = argumentExpression != null
+                       ? expressionTypingServices.getType(
+                            context.scope, argumentExpression,
+                            substitutor.substitute(effectiveExpectedType, Variance.INVARIANT),
+                            context.dataFlowInfo, traceForUnknown)
+                       : null;
         constraintSystem.addSupertypeConstraint(effectiveExpectedType, type, ConstraintPosition.getValueParameterPosition(
                 valueParameterDescriptor.getIndex()));
         //todo no return

compiler/testData/codegen/regressions/kt2739.kt

@@ -0,0 +1,10 @@
+// KT-2739 Error type inferred for hashSet(Pair, Pair, Pair)
+
+fun foo<T>(vararg ts: T): T? = null
+
+class Pair<A>(a: A)
+
+fun box(): String {
+    val v = foo(Pair(1))
+    return if (v == null) "OK" else "fail"
+}

compiler/testData/diagnostics/tests/inference/varargs/varargsAndPair.kt

@@ -0,0 +1,8 @@
+fun foo<T>(vararg <!UNUSED_PARAMETER!>ts<!>: T): T? = null
+
+class Pair<A>(a: A)
+
+fun test() {
+    val v = foo(Pair(1))
+    <!TYPE_MISMATCH!>v<!>: Int // check that it is not error type
+}

compiler/tests/org/jetbrains/jet/checkers/JetDiagnosticsTestGenerated.java

@@ -15,16 +15,13 @@
  */
 package org.jetbrains.jet.checkers;
 
-import junit.framework.Assert;
 import junit.framework.Test;
 import junit.framework.TestSuite;
-
-import java.io.File;
 import org.jetbrains.jet.JetTestUtils;
 import org.jetbrains.jet.test.InnerTestClasses;
 import org.jetbrains.jet.test.TestMetadata;
 
-import org.jetbrains.jet.checkers.AbstractDiagnosticsTestWithEagerResolve;
+import java.io.File;
 
 /** This class is generated by {@link org.jetbrains.jet.checkers.AbstractDiagnosticsTestWithEagerResolve}. DO NOT MODIFY MANUALLY */
 @InnerTestClasses({JetDiagnosticsTestGenerated.Tests.class, JetDiagnosticsTestGenerated.Script.class})
@@ -1471,7 +1468,7 @@ public class JetDiagnosticsTestGenerated extends AbstractDiagnosticsTestWithEage
         }
         
         @TestMetadata("compiler/testData/diagnostics/tests/inference")
-        @InnerTestClasses({Inference.Regressions.class})
+        @InnerTestClasses({Inference.Regressions.class, Inference.Varargs.class})
         public static class Inference extends AbstractDiagnosticsTestWithEagerResolve {
             public void testAllFilesPresentInInference() throws Exception {
                 JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.checkers.AbstractDiagnosticsTestWithEagerResolve", new File("compiler/testData/diagnostics/tests/inference"), "kt", true);
@@ -1715,10 +1712,24 @@ public class JetDiagnosticsTestGenerated extends AbstractDiagnosticsTestWithEage
                 
             }
             
+            @TestMetadata("compiler/testData/diagnostics/tests/inference/varargs")
+            public static class Varargs extends AbstractDiagnosticsTestWithEagerResolve {
+                public void testAllFilesPresentInVarargs() throws Exception {
+                    JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.checkers.AbstractDiagnosticsTestWithEagerResolve", new File("compiler/testData/diagnostics/tests/inference/varargs"), "kt", true);
+                }
+                
+                @TestMetadata("varargsAndPair.kt")
+                public void testVarargsAndPair() throws Exception {
+                    doTest("compiler/testData/diagnostics/tests/inference/varargs/varargsAndPair.kt");
+                }
+                
+            }
+            
             public static Test innerSuite() {
                 TestSuite suite = new TestSuite("Inference");
                 suite.addTestSuite(Inference.class);
                 suite.addTestSuite(Regressions.class);
+                suite.addTestSuite(Varargs.class);
                 return suite;
             }
         }

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

@@ -171,6 +171,9 @@ public class FunctionGenTest extends CodegenTestCase {
         blackBoxFile("regressions/kt1038.kt");
     }
 
+    public void testKt2739() {
+        blackBoxFile("regressions/kt2739.kt");
+    }
 
     public void testReferencesStaticInnerClassMethod() throws Exception {
         blackBoxFileWithJava("functions/referencesStaticInnerClassMethod.kt");