Highlight unused parameters in main function in 1.3 (KT-26999)

idea/src/org/jetbrains/kotlin/idea/highlighter/KotlinPsiCheckerAndHighlightingUpdater.kt

@@ -17,12 +17,14 @@
 package org.jetbrains.kotlin.idea.highlighter
 
 import org.jetbrains.kotlin.idea.inspections.UnusedSymbolInspection
+import org.jetbrains.kotlin.idea.isMainFunction
 import org.jetbrains.kotlin.psi.KtNamedFunction
 import org.jetbrains.kotlin.psi.KtParameter
 
 class KotlinPsiCheckerAndHighlightingUpdater : KotlinPsiChecker() {
     override fun shouldSuppressUnusedParameter(parameter: KtParameter): Boolean {
-        val grandParent = parameter.parent.parent
-        return if (grandParent is KtNamedFunction) UnusedSymbolInspection.isEntryPoint(grandParent) else false
+        val grandParent = parameter.parent.parent as? KtNamedFunction ?: return false
+        if (!UnusedSymbolInspection.isEntryPoint(grandParent)) return false
+        return !grandParent.isMainFunction()
     }
 }

idea/testData/checker/ExtensionFunctions.kt

@@ -50,7 +50,7 @@ fun Int.foo() = this
         fun Any?.equals1(<warning>other</warning> : Any?) : Boolean = true
         fun Any.equals2(<warning>other</warning> : Any?) : Boolean = true
 
-        fun main(args: Array<String>) {
+        fun main(<warning>args</warning>: Array<String>) {
 
             System.out.print(1)
 

idea/testData/checker/UnusedParameterInEntry12.kt

@@ -0,0 +1,5 @@
+// LANGUAGE_VERSION: 1.2
+
+fun main(args: Array<String>) {
+
+}

idea/testData/checker/UnusedParameterInEntry13.kt

@@ -0,0 +1,3 @@
+fun main(<warning descr="[UNUSED_PARAMETER] Parameter 'args' is never used">args</warning>: Array<String>) {
+
+}

idea/testData/checker/infos/SmartCastToEnum.kt

@@ -2,7 +2,7 @@ package test2
 
 <info descr="null">enum</info> class En { A, B, С }
 
-fun main(args: Array<String>) {
+fun main(<warning>args</warning>: Array<String>) {
     val en2: Any? = En.A
     if (en2 is En) {
         when (<info descr="Smart cast to test2.En">en2</info>) {

idea/testData/checker/regression/BadParseForClass.kt

@@ -1,4 +1,4 @@
-fun main(args: Array<String>) {
+fun main(<warning>args</warning>: Array<String>) {
     String.class<EOLError descr="Name expected"></EOLError>
 }
 

idea/testData/checker/regression/DoubleDefine.kt

@@ -38,7 +38,7 @@ fun evaluate(expr: StringBuilder, numbers: ArrayList<Int>): Int {
   return lhs
 }
 
-fun main(args: Array<String>) {
+fun main(<warning>args</warning>: Array<String>) {
   System.out.println("24 game")
   val numbers = ArrayList<Int>(4)
   val rnd = Random();

idea/testData/checker/regression/Jet69.kt

@@ -4,7 +4,7 @@ fun parse(<warning>cmd</warning>: String): Command? { return null  }
 
 fun Any.<warning>equals</warning>(other : Any?) : Boolean = this === other
 
-fun main(args: Array<String>) {
+fun main(<warning>args</warning>: Array<String>) {
     val command = parse("")
     if (command == null) <warning>1</warning> // error on this line, but must be OK
 }

idea/testData/checker/regression/SpecififcityByReceiver.kt

@@ -1,6 +1,6 @@
 fun Any.<warning>equals</warning>(<warning>other</warning> : Any?) : Boolean = true
 
-fun main(args: Array<String>) {
+fun main(<warning>args</warning>: Array<String>) {
 
     val command : Any = 1
 

idea/tests/org/jetbrains/kotlin/checkers/PsiCheckerTestGenerated.java

@@ -321,6 +321,16 @@ public class PsiCheckerTestGenerated extends AbstractPsiCheckerTest {
             runTest("idea/testData/checker/Unused.kt");
         }
 
+        @TestMetadata("UnusedParameterInEntry12.kt")
+        public void testUnusedParameterInEntry12() throws Exception {
+            runTest("idea/testData/checker/UnusedParameterInEntry12.kt");
+        }
+
+        @TestMetadata("UnusedParameterInEntry13.kt")
+        public void testUnusedParameterInEntry13() throws Exception {
+            runTest("idea/testData/checker/UnusedParameterInEntry13.kt");
+        }
+
         @TestMetadata("Variance.kt")
         public void testVariance() throws Exception {
             runTest("idea/testData/checker/Variance.kt");