Added checking for same variance in alternative signatures.

compiler/testData/readJavaBinaryClass/kotlinSignature/error/WrongTypeVariance.java

@@ -0,0 +1,15 @@
+package test;
+
+import java.lang.Number;
+import java.lang.UnsupportedOperationException;
+import java.util.*;
+import java.util.List;
+
+import jet.runtime.typeinfo.KotlinSignature;
+
+public class WrongTypeVariance {
+    @KotlinSignature("fun copy(a : List<out Number>, b : List<Number>) : List<Number>")
+    public List<Number> copy(List<? extends Number> from, List<? super Number> to) {
+        throw new UnsupportedOperationException();
+    }
+}

compiler/testData/readJavaBinaryClass/kotlinSignature/error/WrongTypeVariance.kt

@@ -0,0 +1,9 @@
+package test
+
+import java.util.*
+
+public open class WrongTypeVariance : Object() {
+    public open fun copy(p0 : List<out java.lang.Number?>?, p1 : List<in java.lang.Number?>?) : List<java.lang.Number?>? {
+        throw UnsupportedOperationException()
+    }
+}

compiler/testData/readJavaBinaryClass/kotlinSignature/error/WrongTypeVariance.txt

@@ -0,0 +1,6 @@
+namespace test
+
+public open class test.WrongTypeVariance : java.lang.Object {
+    public final /*constructor*/ fun <init>(): test.WrongTypeVariance
+    public open fun copy(/*0*/ p0: java.util.List<out java.lang.Number?>?, /*1*/ p1: java.util.List<in java.lang.Number?>?): java.util.List<java.lang.Number?>?
+}