lambda -> meth ref: varargs

java/java-analysis-impl/src/com/intellij/codeInspection/LambdaCanBeMethodReferenceInspection.java

@@ -125,8 +125,15 @@ public class LambdaCanBeMethodReferenceInspection extends BaseJavaBatchLocalInsp
     if (argumentList == null) {
       return false;
     }
-    int offset = parameters.length - psiMethod.getParameterList().getParametersCount();
+
+    final int calledParametersCount = psiMethod.getParameterList().getParametersCount();
     final PsiExpression[] expressions = argumentList.getExpressions();
+
+    final int offset = parameters.length - calledParametersCount;
+    if (expressions.length > calledParametersCount) {
+      return false;
+    }
+
     for (int i = 0; i < expressions.length; i++) {
       if (!resolvesToParameter(expressions[i], parameters[i + offset])) {
         return false;

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/lambda2methodReference/afterVarargsCall.java

@@ -0,0 +1,9 @@
+// "Replace lambda with method reference" "true"
+class Example {
+  public void m(String... s) {
+  }
+
+  {
+    Runnable r = this::m;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/lambda2methodReference/beforeVarargsCall.java

@@ -0,0 +1,9 @@
+// "Replace lambda with method reference" "true"
+class Example {
+  public void m(String... s) {
+  }
+
+  {
+    Runnable r = () -> <caret>m();
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/lambda2methodReference/beforeVarargsCallMoreArgs.java

@@ -0,0 +1,12 @@
+// "Replace lambda with method reference" "false"
+import java.util.function.Function;
+class Example {
+ 
+  public String m(String... s) {
+    return "";
+  }
+
+  {
+    Function<String, String> r = (s) -> m(s, s);
+  }
+}