EA-57951 - AIOOBE: AnonymousCanBeLambdaInspection.getInferredType

anonymous -> lambda on varargs place

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

@@ -141,7 +141,19 @@ public class AnonymousCanBeLambdaInspection extends BaseJavaBatchLocalInspection
             .inferTypeArguments(method.getTypeParameters(), parameters, expressions,
                                 ((MethodCandidateInfo)result).getSiteSubstitutor(), callExpr.getParent(),
                                 DefaultParameterTypeInferencePolicy.INSTANCE);
-          return substitutor.substitute(parameters[i].getType());
+          PsiType paramType;
+          if (i < parameters.length) {
+            paramType = parameters[i].getType();
+          }
+          else {
+            paramType = parameters[parameters.length - 1].getType();
+            if (!(paramType instanceof PsiEllipsisType)) {
+              return null;
+            }
+            paramType = ((PsiEllipsisType)paramType).getComponentType();
+          }
+
+          return substitutor.substitute(paramType);
         }
       }
     }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/anonymous2lambda/afterOnVarargsPlace.java

@@ -0,0 +1,10 @@
+// "Replace with lambda" "true"
+class Test2 {
+
+  void f(Runnable... rs){}
+  {
+    f(null, () -> {
+
+    });
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/anonymous2lambda/beforeOnVarargsPlace.java

@@ -0,0 +1,13 @@
+// "Replace with lambda" "true"
+class Test2 {
+
+  void f(Runnable... rs){}
+  {
+    f(null, new Run<caret>nable() {
+      @Override
+      public void run() {
+
+      }
+    });
+  }
+}