Added diagnostic error when in function declaration name was omitted

compiler/testData/diagnostics/tests/declarationChecks/FunctionWithMissingNames.kt

@@ -0,0 +1,25 @@
+annotation class a
+trait A
+trait B
+
+<!FUNCTION_DECLARATION_WITH_NO_NAME, CONFLICTING_OVERLOADS!>fun ()<!> {}
+<!FUNCTION_DECLARATION_WITH_NO_NAME, CONFLICTING_OVERLOADS!>fun A.()<!> {}
+
+<!FUNCTION_DECLARATION_WITH_NO_NAME, CONFLICTING_OVERLOADS!>a fun ()<!> {}
+<!FUNCTION_DECLARATION_WITH_NO_NAME, CONFLICTING_OVERLOADS!>fun [a] A.()<!> {}
+
+class Outer {
+    <!FUNCTION_DECLARATION_WITH_NO_NAME, CONFLICTING_OVERLOADS!>fun ()<!> {}
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>fun B.()<!> {}
+
+    <!FUNCTION_DECLARATION_WITH_NO_NAME, CONFLICTING_OVERLOADS!>a fun ()<!> {}
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>fun [a] A.()<!> {}
+}
+
+fun outerFun() {
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>fun ()<!> {}
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>fun B.()<!> {}
+
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>[a] fun ()<!> {}
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>fun [a] A.()<!> {}
+}

compiler/testData/diagnostics/tests/declarationChecks/FunctionWithMissingNames.txt

@@ -0,0 +1,37 @@
+package
+
+a() internal fun <no name provided>(): kotlin.Unit
+internal fun <no name provided>(): kotlin.Unit
+internal fun outerFun(): kotlin.Unit
+internal fun A.<no name provided>(): kotlin.Unit
+internal fun A.<no name provided>(): kotlin.Unit
+
+internal trait A {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+internal trait B {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+internal final class Outer {
+    public constructor Outer()
+    a() internal final fun <no name provided>(): kotlin.Unit
+    internal final fun <no name provided>(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    internal final fun A.<no name provided>(): kotlin.Unit
+    internal final fun B.<no name provided>(): kotlin.Unit
+}
+
+internal final annotation class a : kotlin.Annotation {
+    public constructor a()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/duplicateJvmSignature/missingNames.kt

@@ -1,4 +1,8 @@
-fun<!SYNTAX!><!> () {
+<!FUNCTION_DECLARATION_WITH_NO_NAME!>fun ()<!> {
+
+}
+
+<!FUNCTION_DECLARATION_WITH_NO_NAME!>fun Outer.()<!> {
 
 }
 
@@ -25,7 +29,7 @@ annotation class<!SYNTAX!><!> <!ANNOTATION_CLASS_WITH_BODY!>{
 }<!>
 
 class Outer {
-    fun<!SYNTAX!><!> () {
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>fun ()<!> {
 
     }
 
@@ -50,4 +54,14 @@ class Outer {
     <!REDECLARATION!>annotation class<!SYNTAX!><!> <!ANNOTATION_CLASS_WITH_BODY!>{
 
     }<!><!>
-}
+}
+
+fun outerFun() {
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>fun ()<!> {
+
+    }
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>fun ()<!> {
+
+    }
+}
+

compiler/testData/diagnostics/tests/duplicateJvmSignature/missingNames.txt

@@ -2,6 +2,8 @@ package
 
 internal val <no name provided>: kotlin.Int = 1
 internal fun <no name provided>(): kotlin.Unit
+internal fun outerFun(): kotlin.Unit
+internal fun Outer.<no name provided>(): kotlin.Unit
 
 internal final class <no name provided> {
     internal constructor <no name provided>()

compiler/testData/diagnostics/tests/recovery/namelessInJava.kt

@@ -12,6 +12,6 @@ public class Nameless {
 import p.*
 
 class K : <!INVISIBLE_MEMBER!>Nameless<!>() {
-    fun<!SYNTAX!><!> () {}
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>fun ()<!> {}
     val<!SYNTAX!><!> : Int = 1
-}
+}

compiler/testData/diagnostics/tests/recovery/namelessMembers.kt

@@ -1,7 +1,7 @@
 // !DIAGNOSTICS: -REDECLARATION
 
 class C {
-    fun<!SYNTAX!><!> () {
+    <!FUNCTION_DECLARATION_WITH_NO_NAME!>fun ()<!> {
 
     }
 

compiler/testData/diagnostics/tests/recovery/namelessToplevelDeclarations.kt

@@ -2,7 +2,7 @@
 
 package<!SYNTAX!><!>
 
-fun<!SYNTAX!><!> () {
+<!FUNCTION_DECLARATION_WITH_NO_NAME!>fun ()<!> {
 
 }