testdata: ensure correct parameters number in functional interface method

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/mostSpecific/DifferentParamsLength.java

@@ -0,0 +1,29 @@
+class Test {
+
+  interface I0 {
+    void m();
+  }
+
+  interface I1 {
+    void m(Object a);
+  }
+
+  interface I2 {
+    void m(Object a1, Object a2);
+  }
+
+  interface IVarargs {
+    void m(Object... as);
+  }
+
+  void call(I0 p) { }
+  void call(I1 p) { }
+  void call(I2 p) { }
+  void call(IVarargs p) { }
+
+  void test() {
+    call(() -> { });
+    call<error descr="Ambiguous method call: both 'Test.call(I1)' and 'Test.call(IVarargs)' match">(p1 -> { })</error>;
+    call((p1, p2) -> {});
+  }
+}

java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/MostSpecificResolutionTest.java

@@ -83,6 +83,10 @@ public class MostSpecificResolutionTest extends LightDaemonAnalyzerTestCase {
     doTest();
   }
 
+  public void testDifferentParamsLength() throws Exception {
+    doTest(false);
+  }
+
   private void doTest() {
     doTest(true);
   }