From 4d19120d84fcd1620aecf24fe55a980cfb663f7b Mon Sep 17 00:00:00 2001
From: Mikhail Glukhikh <mikhail.glukhikh@jetbrains.com>
Date: Thu, 28 Feb 2019 19:25:59 +0300
Subject: [PATCH] Don't report "main parameter not necessary" in objects
 #KT-29414 Fixed

---
 .../jetbrains/kotlin/cfg/ControlFlowInformationProvider.kt | 5 ++++-
 .../inspectionsLocal/unusedMainParameter/object.kt         | 7 +++++++
 .../idea/inspections/LocalInspectionTestGenerated.java     | 5 +++++
 3 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 idea/testData/inspectionsLocal/unusedMainParameter/object.kt

diff --git a/compiler/frontend/src/org/jetbrains/kotlin/cfg/ControlFlowInformationProvider.kt b/compiler/frontend/src/org/jetbrains/kotlin/cfg/ControlFlowInformationProvider.kt
index 5f0aef8951f..3c7be47280f 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/cfg/ControlFlowInformationProvider.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/cfg/ControlFlowInformationProvider.kt
@@ -31,6 +31,7 @@ import org.jetbrains.kotlin.diagnostics.Errors.*
 import org.jetbrains.kotlin.idea.MainFunctionDetector
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.psiUtil.containingClassOrObject
 import org.jetbrains.kotlin.resolve.*
 import org.jetbrains.kotlin.resolve.BindingContext.*
 import org.jetbrains.kotlin.resolve.bindingContextUtil.isUsedAsExpression
@@ -736,7 +737,9 @@ class ControlFlowInformationProvider private constructor(
                             return
                         }
                         !languageVersionSettings.supportsFeature(LanguageFeature.WarningOnMainUnusedParameter) -> {
-                            trace.record(UNUSED_MAIN_PARAMETER, element)
+                            if (owner.containingClassOrObject == null) {
+                                trace.record(UNUSED_MAIN_PARAMETER, element)
+                            }
                             return
                         }
                     }
diff --git a/idea/testData/inspectionsLocal/unusedMainParameter/object.kt b/idea/testData/inspectionsLocal/unusedMainParameter/object.kt
new file mode 100644
index 00000000000..8593b580d56
--- /dev/null
+++ b/idea/testData/inspectionsLocal/unusedMainParameter/object.kt
@@ -0,0 +1,7 @@
+// LANGUAGE_VERSION: 1.3
+// WITH_RUNTIME
+// PROBLEM: none
+
+object SomeMain {
+    @JvmStatic fun main(<caret>args: Array<String>) {}
+}
\ No newline at end of file
diff --git a/idea/tests/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java b/idea/tests/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java
index ebc0e96be06..f767641f153 100644
--- a/idea/tests/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java
+++ b/idea/tests/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java
@@ -8136,6 +8136,11 @@ public class LocalInspectionTestGenerated extends AbstractLocalInspectionTest {
             runTest("idea/testData/inspectionsLocal/unusedMainParameter/legacy.kt");
         }
 
+        @TestMetadata("object.kt")
+        public void testObject() throws Exception {
+            runTest("idea/testData/inspectionsLocal/unusedMainParameter/object.kt");
+        }
+
         @TestMetadata("simple.kt")
         public void testSimple() throws Exception {
             runTest("idea/testData/inspectionsLocal/unusedMainParameter/simple.kt");