diff --git a/compiler/testData/cli/js/simple2js.kt b/compiler/testData/cli/js/simple2js.kt
index 7de943c30d9..78e3db2779f 100644
--- a/compiler/testData/cli/js/simple2js.kt
+++ b/compiler/testData/cli/js/simple2js.kt
@@ -1 +1 @@
-fun main(args: Array<String>) {}
\ No newline at end of file
+fun main() {}
\ No newline at end of file
diff --git a/compiler/testData/cli/js/withLib.kt b/compiler/testData/cli/js/withLib.kt
index 2c8fbaadc4c..2ef0edf83f5 100644
--- a/compiler/testData/cli/js/withLib.kt
+++ b/compiler/testData/cli/js/withLib.kt
@@ -1,7 +1,7 @@
 import kotlin.Pair
 import library.sample.*
 
-fun main(args: Array<String>) {
+fun main() {
     val p = Pair(10, 20)
     val x = pairAdd(p)
     println("x=$x")
diff --git a/compiler/testData/cli/jvm/jvm8Target.kt b/compiler/testData/cli/jvm/jvm8Target.kt
index 9c8ea32d77a..11007910864 100644
--- a/compiler/testData/cli/jvm/jvm8Target.kt
+++ b/compiler/testData/cli/jvm/jvm8Target.kt
@@ -2,6 +2,6 @@ interface A {
     fun test() = "OK"
 }
 
-fun main(args: Array<String>) {
+fun main() {
     println(object : A {}.test())
 }
\ No newline at end of file
diff --git a/compiler/testData/cli/jvm/kotlinHomeWithoutStdlib.out b/compiler/testData/cli/jvm/kotlinHomeWithoutStdlib.out
index decdb206bce..e5685cfb624 100644
--- a/compiler/testData/cli/jvm/kotlinHomeWithoutStdlib.out
+++ b/compiler/testData/cli/jvm/kotlinHomeWithoutStdlib.out
@@ -1,10 +1,7 @@
 warning: unable to find kotlin-stdlib.jar in the Kotlin home directory. Pass either '-no-stdlib' to prevent adding it to the classpath, or the correct '-kotlin-home'
 warning: unable to find kotlin-script-runtime.jar in the Kotlin home directory. Pass either '-no-stdlib' to prevent adding it to the classpath, or the correct '-kotlin-home'
 warning: unable to find kotlin-reflect.jar in the Kotlin home directory. Pass either '-no-reflect' or '-no-stdlib' to prevent adding it to the classpath, or the correct '-kotlin-home'
-compiler/testData/cli/jvm/simple.kt:1:16: error: unresolved reference: Array
-fun main(args: Array<String>) = println("hello world")
-               ^
-compiler/testData/cli/jvm/simple.kt:1:33: error: unresolved reference: println
-fun main(args: Array<String>) = println("hello world")
-                                ^
+compiler/testData/cli/jvm/simple.kt:1:14: error: unresolved reference: println
+fun main() = println("hello world")
+             ^
 COMPILATION_ERROR
diff --git a/compiler/testData/cli/jvm/kt22304_2.kt b/compiler/testData/cli/jvm/kt22304_2.kt
index 85256b281fd..ce72ea657ed 100644
--- a/compiler/testData/cli/jvm/kt22304_2.kt
+++ b/compiler/testData/cli/jvm/kt22304_2.kt
@@ -2,7 +2,7 @@ package beforeTest //package name should be less than imported one
 
 import test.*
 
-fun main(args: Array<String>) {
+fun main() {
     "O".switchMapOnce {
 
         "K".switchMapOnce {
diff --git a/compiler/testData/cli/jvm/simple.kt b/compiler/testData/cli/jvm/simple.kt
index 9b7592664fb..0d62c46ac1b 100644
--- a/compiler/testData/cli/jvm/simple.kt
+++ b/compiler/testData/cli/jvm/simple.kt
@@ -1 +1 @@
-fun main(args: Array<String>) = println("hello world")
+fun main() = println("hello world")
diff --git a/compiler/testData/codegen/box/diagnostics/vararg/kt4172.kt b/compiler/testData/codegen/box/diagnostics/vararg/kt4172.kt
index 61c51aeb0b9..0fed060eb7d 100644
--- a/compiler/testData/codegen/box/diagnostics/vararg/kt4172.kt
+++ b/compiler/testData/codegen/box/diagnostics/vararg/kt4172.kt
@@ -3,7 +3,8 @@ fun box(): String {
     return "OK"
 }
 
-fun main(<!UNUSED_PARAMETER!>args<!>: Array<String>) {
+fun main(args: Array<String>) {
+    args.size
     D.foo(array())
 }
 
diff --git a/compiler/testData/integration/ant/js/additionalArguments/hello.kt b/compiler/testData/integration/ant/js/additionalArguments/hello.kt
index 7f2fc04541b..c0c7780a920 100644
--- a/compiler/testData/integration/ant/js/additionalArguments/hello.kt
+++ b/compiler/testData/integration/ant/js/additionalArguments/hello.kt
@@ -4,7 +4,7 @@ inline fun foo(f: () -> Unit) = f()
 
 var ok = "Fail"
 
-fun main(args : Array<String>) {
+fun main() {
     foo {
         ok = "OK"
     }
diff --git a/compiler/testData/integration/ant/js/simpleWithMain/root1/foo.kt b/compiler/testData/integration/ant/js/simpleWithMain/root1/foo.kt
index e374b249313..ae38953291a 100644
--- a/compiler/testData/integration/ant/js/simpleWithMain/root1/foo.kt
+++ b/compiler/testData/integration/ant/js/simpleWithMain/root1/foo.kt
@@ -2,7 +2,7 @@ package foo
 
 var ok = "FAIL"
 
-fun main(args: Array<String>) {
+fun main() {
     ok = "OK"
 }
 
diff --git a/compiler/testData/integration/ant/js/simpleWithMainFQArgs/root1/foo.kt b/compiler/testData/integration/ant/js/simpleWithMainFQArgs/root1/foo.kt
index 84c3a8a43ee..5585b13a4b0 100644
--- a/compiler/testData/integration/ant/js/simpleWithMainFQArgs/root1/foo.kt
+++ b/compiler/testData/integration/ant/js/simpleWithMainFQArgs/root1/foo.kt
@@ -3,6 +3,7 @@ package foo
 var ok = "FAIL"
 
 fun main(args: kotlin.Array<kotlin.String>) {
+    args.size
     ok = "OK"
 }
 
diff --git a/compiler/testData/integration/ant/js/simpleWithStdlib/root1/foo.kt b/compiler/testData/integration/ant/js/simpleWithStdlib/root1/foo.kt
index 9c26449e6f4..7f2587a693c 100644
--- a/compiler/testData/integration/ant/js/simpleWithStdlib/root1/foo.kt
+++ b/compiler/testData/integration/ant/js/simpleWithStdlib/root1/foo.kt
@@ -4,7 +4,7 @@ var ok = "FAIL"
 
 val hello = Pair("Hello", "World")
 
-fun main(args: Array<String>) {
+fun main() {
     ok = "OK"
     println(hello.first + " " + hello.second)
 }
diff --git a/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFileAsAnotherLib/root1/foo.kt b/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFileAsAnotherLib/root1/foo.kt
index 743fab365aa..7f2473a4c68 100644
--- a/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFileAsAnotherLib/root1/foo.kt
+++ b/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFileAsAnotherLib/root1/foo.kt
@@ -5,7 +5,7 @@ import kotlin.js.Date
 
 var ok = "FAIL"
 
-fun main(args: Array<String>) {
+fun main() {
     val x = ClassA().value
     if (x == 100) {
         ok = "OK"
diff --git a/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFileAsAnotherLibModuleKind/root1/foo.kt b/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFileAsAnotherLibModuleKind/root1/foo.kt
index 743fab365aa..7f2473a4c68 100644
--- a/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFileAsAnotherLibModuleKind/root1/foo.kt
+++ b/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFileAsAnotherLibModuleKind/root1/foo.kt
@@ -5,7 +5,7 @@ import kotlin.js.Date
 
 var ok = "FAIL"
 
-fun main(args: Array<String>) {
+fun main() {
     val x = ClassA().value
     if (x == 100) {
         ok = "OK"
diff --git a/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFilesWithTwoModulesAsLibrary/root1/foo.kt b/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFilesWithTwoModulesAsLibrary/root1/foo.kt
index 043ee06b6c7..b6bb2e2d46e 100644
--- a/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFilesWithTwoModulesAsLibrary/root1/foo.kt
+++ b/compiler/testData/integration/ant/js/simpleWithStdlibAndJsFilesWithTwoModulesAsLibrary/root1/foo.kt
@@ -5,7 +5,7 @@ import kotlin.js.Date
 
 var ok = "FAIL"
 
-fun main(args: Array<String>) {
+fun main() {
     val x = ClassA().value
     if (x == 100 && Date().extFun() == "Date.extFun" && ClassA().extFun() == "ClassA.extFun") {
         ok = "OK"
diff --git a/compiler/testData/integration/ant/js/simpleWithStdlibAndTwoJsFilesAsLibraries/root1/foo.kt b/compiler/testData/integration/ant/js/simpleWithStdlibAndTwoJsFilesAsLibraries/root1/foo.kt
index 043ee06b6c7..b6bb2e2d46e 100644
--- a/compiler/testData/integration/ant/js/simpleWithStdlibAndTwoJsFilesAsLibraries/root1/foo.kt
+++ b/compiler/testData/integration/ant/js/simpleWithStdlibAndTwoJsFilesAsLibraries/root1/foo.kt
@@ -5,7 +5,7 @@ import kotlin.js.Date
 
 var ok = "FAIL"
 
-fun main(args: Array<String>) {
+fun main() {
     val x = ClassA().value
     if (x == 100 && Date().extFun() == "Date.extFun" && ClassA().extFun() == "ClassA.extFun") {
         ok = "OK"
diff --git a/compiler/testData/integration/ant/js/simpleWithVarargMain/root1/foo.kt b/compiler/testData/integration/ant/js/simpleWithVarargMain/root1/foo.kt
index e9b5d129049..a3f5e1d5c8c 100644
--- a/compiler/testData/integration/ant/js/simpleWithVarargMain/root1/foo.kt
+++ b/compiler/testData/integration/ant/js/simpleWithVarargMain/root1/foo.kt
@@ -3,6 +3,7 @@ package foo
 var ok = "FAIL"
 
 fun main(vararg args: kotlin.String) {
+    args.size
     ok = "OK"
 }
 
diff --git a/compiler/testData/integration/ant/js/simpleWithoutStdlibAndFolderAsAnotherLib/root1/foo.kt b/compiler/testData/integration/ant/js/simpleWithoutStdlibAndFolderAsAnotherLib/root1/foo.kt
index c2ddea45024..7f768caf014 100644
--- a/compiler/testData/integration/ant/js/simpleWithoutStdlibAndFolderAsAnotherLib/root1/foo.kt
+++ b/compiler/testData/integration/ant/js/simpleWithoutStdlibAndFolderAsAnotherLib/root1/foo.kt
@@ -4,7 +4,7 @@ import library.sample.*
 
 var ok = "FAIL"
 
-fun main(args: Array<String>) {
+fun main() {
     val x = ClassA().value
     if (x == 100) {
         ok = "OK"
diff --git a/compiler/testData/integration/ant/js/simpleWithoutStdlibAndJsFileAsAnotherLib/root1/foo.kt b/compiler/testData/integration/ant/js/simpleWithoutStdlibAndJsFileAsAnotherLib/root1/foo.kt
index c2ddea45024..7f768caf014 100644
--- a/compiler/testData/integration/ant/js/simpleWithoutStdlibAndJsFileAsAnotherLib/root1/foo.kt
+++ b/compiler/testData/integration/ant/js/simpleWithoutStdlibAndJsFileAsAnotherLib/root1/foo.kt
@@ -4,7 +4,7 @@ import library.sample.*
 
 var ok = "FAIL"
 
-fun main(args: Array<String>) {
+fun main() {
     val x = ClassA().value
     if (x == 100) {
         ok = "OK"
diff --git a/compiler/testData/integration/ant/jvm/additionalArguments/hello.kt b/compiler/testData/integration/ant/jvm/additionalArguments/hello.kt
index dea9cf93f9d..303c21bb168 100644
--- a/compiler/testData/integration/ant/jvm/additionalArguments/hello.kt
+++ b/compiler/testData/integration/ant/jvm/additionalArguments/hello.kt
@@ -1,6 +1,6 @@
 package hello
 
-fun main(args : Array<String>) {
+fun main() {
     for (s in listOf("a")) {
         println("Hello, $s!")
     }
diff --git a/compiler/testData/integration/ant/jvm/helloWorld/hello.kt b/compiler/testData/integration/ant/jvm/helloWorld/hello.kt
index 3ec4e92d7e8..21844c2c3c3 100644
--- a/compiler/testData/integration/ant/jvm/helloWorld/hello.kt
+++ b/compiler/testData/integration/ant/jvm/helloWorld/hello.kt
@@ -1,6 +1,6 @@
 package hello
 
-fun main(args : Array<String>) {
+fun main() {
     for (s in arrayListOf("a"))
       println("Hello, $s!")
 
diff --git a/compiler/testData/integration/ant/jvm/internalMembers/module2.kt b/compiler/testData/integration/ant/jvm/internalMembers/module2.kt
index 0692e9f68bc..708e1261fe2 100644
--- a/compiler/testData/integration/ant/jvm/internalMembers/module2.kt
+++ b/compiler/testData/integration/ant/jvm/internalMembers/module2.kt
@@ -21,7 +21,7 @@ public fun invokeOnB(b: B) = b.z + b.test()
 
 public fun invokeOnC(c: C) = c.z + c.test()
 
-fun main(args: Array<String>) {
+fun main() {
     val b = B()
     println(invokeOnA(b))
     println(invokeOnB(b))
diff --git a/compiler/testData/integration/ant/jvm/jvmClasspath/hello.kt b/compiler/testData/integration/ant/jvm/jvmClasspath/hello.kt
index 85d73c1bbd3..8ff946bcfef 100644
--- a/compiler/testData/integration/ant/jvm/jvmClasspath/hello.kt
+++ b/compiler/testData/integration/ant/jvm/jvmClasspath/hello.kt
@@ -6,7 +6,7 @@ import javax.crypto.Cipher
 import com.sun.crypto.provider.SunJCE
 import sun.nio.ByteBuffered
 
-fun main(args : Array<String>) {
+fun main() {
     val a = Big5() // charsets.jar
     val c = DNSNameService() // dnsns.jar
     val e : Cipher? = null // jce.jar
diff --git a/compiler/testData/integration/ant/jvm/kt11995/test.kt b/compiler/testData/integration/ant/jvm/kt11995/test.kt
index bf70284213b..eac08ba515d 100644
--- a/compiler/testData/integration/ant/jvm/kt11995/test.kt
+++ b/compiler/testData/integration/ant/jvm/kt11995/test.kt
@@ -4,6 +4,6 @@ fun foo(a: Any) = foo(1)
 
 fun foo(i: Int) = "foo(Int)"
 
-fun main(args: Array<String>) {
+fun main() {
     println(foo(""))
 }
\ No newline at end of file
diff --git a/compiler/testData/integration/ant/jvm/mainInFiles/a.kt b/compiler/testData/integration/ant/jvm/mainInFiles/a.kt
index 486f8f21eac..906a32e8f70 100644
--- a/compiler/testData/integration/ant/jvm/mainInFiles/a.kt
+++ b/compiler/testData/integration/ant/jvm/mainInFiles/a.kt
@@ -1,5 +1,5 @@
 package pkg
 
-fun main(args : Array<String>) {
+fun main() {
     println("A.main Ok")
 }
diff --git a/compiler/testData/integration/ant/jvm/mainInFiles/b.kt b/compiler/testData/integration/ant/jvm/mainInFiles/b.kt
index 35572138f55..dfd49099887 100644
--- a/compiler/testData/integration/ant/jvm/mainInFiles/b.kt
+++ b/compiler/testData/integration/ant/jvm/mainInFiles/b.kt
@@ -1,5 +1,5 @@
 package pkg
 
-fun main(args : Array<String>) {
+fun main() {
     println("B.main Ok")
 }
diff --git a/compiler/testData/integration/ant/jvm/manySourceRoots/root1/hello.kt b/compiler/testData/integration/ant/jvm/manySourceRoots/root1/hello.kt
index 0fce73d03ce..cb1c0a9c308 100644
--- a/compiler/testData/integration/ant/jvm/manySourceRoots/root1/hello.kt
+++ b/compiler/testData/integration/ant/jvm/manySourceRoots/root1/hello.kt
@@ -1,6 +1,6 @@
 package hello
 
-fun main(args : Array<String>) {
+fun main() {
     for (s in arrayListOf("a"))
       println("Hello, $s!")
     foo()
diff --git a/compiler/testData/integration/ant/jvm/moduleName/hello.kt b/compiler/testData/integration/ant/jvm/moduleName/hello.kt
index dfc8315b01c..f7d6bff79de 100644
--- a/compiler/testData/integration/ant/jvm/moduleName/hello.kt
+++ b/compiler/testData/integration/ant/jvm/moduleName/hello.kt
@@ -1,6 +1,6 @@
 package hello
 
-fun main(args : Array<String>) {
+fun main() {
     val systemClassLoader = ClassLoader.getSystemClassLoader()
     val moduleName = "META-INF/test.kotlin_module"
     val resourceAsStream = systemClassLoader.getResourceAsStream(moduleName)
diff --git a/compiler/testData/integration/ant/jvm/moduleNameDefault/hello.kt b/compiler/testData/integration/ant/jvm/moduleNameDefault/hello.kt
index a161a0b029c..232c42955b6 100644
--- a/compiler/testData/integration/ant/jvm/moduleNameDefault/hello.kt
+++ b/compiler/testData/integration/ant/jvm/moduleNameDefault/hello.kt
@@ -1,6 +1,6 @@
 package hello
 
-fun main(args : Array<String>) {
+fun main() {
     val systemClassLoader = ClassLoader.getSystemClassLoader()
     val moduleName = "META-INF/build.kotlin_module"
     val resourceAsStream = systemClassLoader.getResourceAsStream(moduleName)
diff --git a/compiler/testData/integration/ant/jvm/moduleNameWithKotlin/hello.kt b/compiler/testData/integration/ant/jvm/moduleNameWithKotlin/hello.kt
index 1e1f84467c0..cee19076024 100644
--- a/compiler/testData/integration/ant/jvm/moduleNameWithKotlin/hello.kt
+++ b/compiler/testData/integration/ant/jvm/moduleNameWithKotlin/hello.kt
@@ -1,6 +1,6 @@
 package hello
 
-fun main(args: Array<String>) {
+fun main() {
     val systemClassLoader = ClassLoader.getSystemClassLoader()
     val moduleFile = "META-INF/build.kotlin_module"
     val resourceAsStream = systemClassLoader.getResourceAsStream(moduleFile)
diff --git a/compiler/testData/integration/ant/jvm/overloadResolutionOnCollectionLiteral/literals.kt b/compiler/testData/integration/ant/jvm/overloadResolutionOnCollectionLiteral/literals.kt
index 7010f455a21..3625a4d2c2c 100644
--- a/compiler/testData/integration/ant/jvm/overloadResolutionOnCollectionLiteral/literals.kt
+++ b/compiler/testData/integration/ant/jvm/overloadResolutionOnCollectionLiteral/literals.kt
@@ -9,7 +9,7 @@ fun foo() {}
 @AnnInt(intArrayOf(1, 2))
 fun bar() {}
 
-fun main(args: Array<String>) {
+fun main() {
     foo()
     bar()
 }
\ No newline at end of file
diff --git a/compiler/testData/integration/ant/jvm/suppressWarnings/hello.kt b/compiler/testData/integration/ant/jvm/suppressWarnings/hello.kt
index 3aa467c4ea8..99b33acb705 100644
--- a/compiler/testData/integration/ant/jvm/suppressWarnings/hello.kt
+++ b/compiler/testData/integration/ant/jvm/suppressWarnings/hello.kt
@@ -8,6 +8,6 @@ interface T {
     abstract fun foo()
 }
 
-fun main(args : Array<String>) {
+fun main() {
     println("Hi!")
 }
diff --git a/compiler/testData/integration/ant/jvm/twoStdlibForCollectionLiterals/literals.kt b/compiler/testData/integration/ant/jvm/twoStdlibForCollectionLiterals/literals.kt
index 7010f455a21..3625a4d2c2c 100644
--- a/compiler/testData/integration/ant/jvm/twoStdlibForCollectionLiterals/literals.kt
+++ b/compiler/testData/integration/ant/jvm/twoStdlibForCollectionLiterals/literals.kt
@@ -9,7 +9,7 @@ fun foo() {}
 @AnnInt(intArrayOf(1, 2))
 fun bar() {}
 
-fun main(args: Array<String>) {
+fun main() {
     foo()
     bar()
 }
\ No newline at end of file
diff --git a/compiler/testData/integration/ant/jvm/valWithInvoke/test.kt b/compiler/testData/integration/ant/jvm/valWithInvoke/test.kt
index 17f64e3f7f4..24b7cc42be7 100644
--- a/compiler/testData/integration/ant/jvm/valWithInvoke/test.kt
+++ b/compiler/testData/integration/ant/jvm/valWithInvoke/test.kt
@@ -5,6 +5,6 @@ val foo: Int = 6
 
 operator fun Int.invoke() = this
 
-fun main(args: Array<String>) {
+fun main() {
     println(foo())
 }
\ No newline at end of file
diff --git a/compiler/testData/integration/ant/jvm/verbose/hello.kt b/compiler/testData/integration/ant/jvm/verbose/hello.kt
index 30d773783e7..1caa88fc116 100644
--- a/compiler/testData/integration/ant/jvm/verbose/hello.kt
+++ b/compiler/testData/integration/ant/jvm/verbose/hello.kt
@@ -1,5 +1,5 @@
 package hello
 
-fun main(args : Array<String>) {
+fun main() {
     println("Hi!")
 }
diff --git a/compiler/testData/integration/ant/jvm/version/hello.kt b/compiler/testData/integration/ant/jvm/version/hello.kt
index f04b2b73595..2234912f1f1 100644
--- a/compiler/testData/integration/ant/jvm/version/hello.kt
+++ b/compiler/testData/integration/ant/jvm/version/hello.kt
@@ -1,5 +1,5 @@
 package hello
 
-fun main(args : Array<String>) {
+fun main() {
     println("Yo!")
 }
diff --git a/compiler/testData/integration/ant/jvm/withKotlinNoJavaSources/hello.kt b/compiler/testData/integration/ant/jvm/withKotlinNoJavaSources/hello.kt
index 6c9ab7fe60a..5424ad5cbf2 100644
--- a/compiler/testData/integration/ant/jvm/withKotlinNoJavaSources/hello.kt
+++ b/compiler/testData/integration/ant/jvm/withKotlinNoJavaSources/hello.kt
@@ -1,5 +1,5 @@
 package hello
 
-fun main(args: Array<String>) {
+fun main() {
     println("Hello!")
 }
diff --git a/compiler/testData/integration/ant/jvm/wrongCallForCollectionLiteral/literals.kt b/compiler/testData/integration/ant/jvm/wrongCallForCollectionLiteral/literals.kt
index 7010f455a21..3625a4d2c2c 100644
--- a/compiler/testData/integration/ant/jvm/wrongCallForCollectionLiteral/literals.kt
+++ b/compiler/testData/integration/ant/jvm/wrongCallForCollectionLiteral/literals.kt
@@ -9,7 +9,7 @@ fun foo() {}
 @AnnInt(intArrayOf(1, 2))
 fun bar() {}
 
-fun main(args: Array<String>) {
+fun main() {
     foo()
     bar()
 }
\ No newline at end of file
diff --git a/compiler/testData/integration/smoke/compilationFailed/hello.kt b/compiler/testData/integration/smoke/compilationFailed/hello.kt
index 139b0ddc047..61a8d5ca92d 100644
--- a/compiler/testData/integration/smoke/compilationFailed/hello.kt
+++ b/compiler/testData/integration/smoke/compilationFailed/hello.kt
@@ -1,5 +1,5 @@
 package Hello
 
-fun main(args : Array<String>) {
+fun main() {
     a
 }
diff --git a/compiler/testData/integration/smoke/helloApp/hello.kt b/compiler/testData/integration/smoke/helloApp/hello.kt
index 9098e3b590a..54674a02472 100644
--- a/compiler/testData/integration/smoke/helloApp/hello.kt
+++ b/compiler/testData/integration/smoke/helloApp/hello.kt
@@ -1,5 +1,5 @@
 package Hello
 
-fun main(args : Array<String>) {
+fun main() {
     System.out.println("Hello!")
 }
diff --git a/compiler/testData/integration/smoke/helloAppFQMain/hello.kt b/compiler/testData/integration/smoke/helloAppFQMain/hello.kt
index dd83e3c3de8..b6b68d62f4d 100644
--- a/compiler/testData/integration/smoke/helloAppFQMain/hello.kt
+++ b/compiler/testData/integration/smoke/helloAppFQMain/hello.kt
@@ -1,5 +1,6 @@
 package Hello
 
 fun main(args: kotlin.Array<kotlin.String>) {
+    args.size
     System.out.println("Hello from fully qualified main!")
 }
diff --git a/compiler/testData/integration/smoke/helloAppOldAndParameterlessMain/hello.kt b/compiler/testData/integration/smoke/helloAppOldAndParameterlessMain/hello.kt
index 3625851a795..b5c9eb3b90e 100644
--- a/compiler/testData/integration/smoke/helloAppOldAndParameterlessMain/hello.kt
+++ b/compiler/testData/integration/smoke/helloAppOldAndParameterlessMain/hello.kt
@@ -1,6 +1,7 @@
 package Hello
 
 fun main(args: Array<String>) {
+    args.size
     System.out.println("Hello!")
 }
 
diff --git a/compiler/testData/integration/smoke/helloAppVarargMain/hello.kt b/compiler/testData/integration/smoke/helloAppVarargMain/hello.kt
index 414877a7dba..0382047311b 100644
--- a/compiler/testData/integration/smoke/helloAppVarargMain/hello.kt
+++ b/compiler/testData/integration/smoke/helloAppVarargMain/hello.kt
@@ -1,5 +1,6 @@
 package Hello
 
 fun main(vararg args: kotlin.String) {
+    args.size
     System.out.println("Hello from vararg main!")
 }
diff --git a/compiler/testData/integration/smoke/inlineOnly/inlineOnly.kt b/compiler/testData/integration/smoke/inlineOnly/inlineOnly.kt
index 399fed593d1..76345c3c0db 100644
--- a/compiler/testData/integration/smoke/inlineOnly/inlineOnly.kt
+++ b/compiler/testData/integration/smoke/inlineOnly/inlineOnly.kt
@@ -1,5 +1,5 @@
 package InlineOnly
 
-fun main(args : Array<String>) {
-    error("my error")
+fun main(args: Array<String>) {
+    error("my error: ${args.size}")
 }
diff --git a/compiler/testData/integration/smoke/inlineOnly/inlineOnly.run.expected b/compiler/testData/integration/smoke/inlineOnly/inlineOnly.run.expected
index cad7d6cd4a9..06ebfd1b2a5 100644
--- a/compiler/testData/integration/smoke/inlineOnly/inlineOnly.run.expected
+++ b/compiler/testData/integration/smoke/inlineOnly/inlineOnly.run.expected
@@ -1,6 +1,6 @@
 
 ERR:
-Exception in thread "main" java.lang.IllegalStateException: my error
+Exception in thread "main" java.lang.IllegalStateException: my error: 0
 	at InlineOnly.InlineOnlyKt.main(inlineOnly.kt:4)
 
 Return code: 1
diff --git a/compiler/testData/launcher/emptyMain.kt b/compiler/testData/launcher/emptyMain.kt
index 64a3a94b727..ffc121c8070 100644
--- a/compiler/testData/launcher/emptyMain.kt
+++ b/compiler/testData/launcher/emptyMain.kt
@@ -1,4 +1,4 @@
 package test
 
-fun main(args: Array<String>) {
+fun main() {
 }
diff --git a/compiler/testData/launcher/helloWorld.kt b/compiler/testData/launcher/helloWorld.kt
index aa5490220d0..1cbd68a2668 100644
--- a/compiler/testData/launcher/helloWorld.kt
+++ b/compiler/testData/launcher/helloWorld.kt
@@ -1,5 +1,5 @@
 package test
 
-fun main(args: Array<String>) {
+fun main() {
     println("Hello!")
 }
diff --git a/compiler/testData/launcher/reflectionUsage.kt b/compiler/testData/launcher/reflectionUsage.kt
index 3e0e0c26f35..1cb741e4a76 100644
--- a/compiler/testData/launcher/reflectionUsage.kt
+++ b/compiler/testData/launcher/reflectionUsage.kt
@@ -1,6 +1,6 @@
 class Foo(val bar: String?)
 
-fun main(args: Array<String>) {
+fun main() {
     try {
         if (Foo::bar.returnType.isMarkedNullable) {
             print("Foo#bar is nullable")
diff --git a/compiler/testData/multiplatform/simple/common.kt b/compiler/testData/multiplatform/simple/common.kt
index e844ba29e69..e679d02330f 100644
--- a/compiler/testData/multiplatform/simple/common.kt
+++ b/compiler/testData/multiplatform/simple/common.kt
@@ -2,7 +2,7 @@ expect class Printer() {
     fun print(message: String)
 }
 
-fun main(args: Array<String>) {
+fun main() {
     val printer = Printer()
     printer.print("Hello, world!")
 }
diff --git a/compiler/tests/org/jetbrains/kotlin/integration/CompilerFileLimitTest.kt b/compiler/tests/org/jetbrains/kotlin/integration/CompilerFileLimitTest.kt
index 9cf04703f18..e0ab8ef20e2 100644
--- a/compiler/tests/org/jetbrains/kotlin/integration/CompilerFileLimitTest.kt
+++ b/compiler/tests/org/jetbrains/kotlin/integration/CompilerFileLimitTest.kt
@@ -47,7 +47,7 @@ class CompilerFileLimitTest : CompilerSmokeTestBase() {
                     appendln("// kotlin rules ... and stuff")
                 }
             }
-            appendln("fun main(args: Array<String>)")
+            appendln("fun main()")
             appendln("{")
             appendln("\tval result = Class5().foo() + Class$size().foo()")
             appendln("\tprintln(result)")
@@ -81,7 +81,7 @@ class CompilerFileLimitTest : CompilerSmokeTestBase() {
         return buildString {
             append("package usesLarge\n\n")
             append("import large.Large\n\n")
-            appendln("fun main(args: Array<String>)")
+            appendln("fun main()")
             appendln("{")
             appendln("\tval result = Large.Class0().foo() + Large.Class$size().foo()")
             appendln("\tprintln(result)")
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/test-plugins/use-test-extension/src/main/kotlin/main.kt b/libraries/tools/kotlin-maven-plugin-test/src/it/test-plugins/use-test-extension/src/main/kotlin/main.kt
index 9f35c803aa1..d3d8e47c068 100644
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/test-plugins/use-test-extension/src/main/kotlin/main.kt
+++ b/libraries/tools/kotlin-maven-plugin-test/src/it/test-plugins/use-test-extension/src/main/kotlin/main.kt
@@ -1,5 +1,5 @@
 package org.jetbrains.kotlin.test
 
-fun main(args: Array<String>) {
+fun main() {
     println("OK")
 }
diff --git a/libraries/tools/kotlin-maven-plugin/src/it/simple/src/main/kotlin/yo.kt b/libraries/tools/kotlin-maven-plugin/src/it/simple/src/main/kotlin/yo.kt
index 174d4dd3644..e97bc7ec751 100644
--- a/libraries/tools/kotlin-maven-plugin/src/it/simple/src/main/kotlin/yo.kt
+++ b/libraries/tools/kotlin-maven-plugin/src/it/simple/src/main/kotlin/yo.kt
@@ -1,2 +1,2 @@
-fun main(vararg args: String) {
+fun main() {
 }
\ No newline at end of file