Minor. Remove redundant parameter

LexicalWritableScope.implicitReceiver is always null for all constructor's usages

compiler/frontend/src/org/jetbrains/kotlin/resolve/DescriptorResolver.java

@@ -665,7 +665,7 @@ public class DescriptorResolver {
             }
             else {
                 LexicalWritableScope writableScope = new LexicalWritableScope(
-                        scope, containingDeclaration, false, null, new TraceBasedLocalRedeclarationChecker(trace, overloadChecker),
+                        scope, containingDeclaration, false, new TraceBasedLocalRedeclarationChecker(trace, overloadChecker),
                         LexicalScopeKind.TYPE_ALIAS_HEADER);
                 typeParameterDescriptors = resolveTypeParametersForDescriptor(
                         typeAliasDescriptor, writableScope, scope, typeParameters, trace);
@@ -780,7 +780,7 @@ public class DescriptorResolver {
             }
             else {
                 LexicalWritableScope writableScope = new LexicalWritableScope(
-                        scope, containingDeclaration, false, null, new TraceBasedLocalRedeclarationChecker(trace, overloadChecker),
+                        scope, containingDeclaration, false, new TraceBasedLocalRedeclarationChecker(trace, overloadChecker),
                         LexicalScopeKind.PROPERTY_HEADER);
                 typeParameterDescriptors = resolveTypeParametersForDescriptor(
                         propertyDescriptor, writableScope, scope, typeParameters, trace);

compiler/frontend/src/org/jetbrains/kotlin/resolve/FunctionDescriptorResolver.kt

@@ -145,8 +145,8 @@ class FunctionDescriptorResolver(
             trace: BindingTrace,
             expectedFunctionType: KotlinType
     ) {
-        val headerScope = LexicalWritableScope(scope, functionDescriptor, true, null,
+        val headerScope = LexicalWritableScope(scope, functionDescriptor, true,
-                                              TraceBasedLocalRedeclarationChecker(trace, overloadChecker), LexicalScopeKind.FUNCTION_HEADER)
+                                               TraceBasedLocalRedeclarationChecker(trace, overloadChecker), LexicalScopeKind.FUNCTION_HEADER)
 
         val typeParameterDescriptors = descriptorResolver.
                 resolveTypeParametersForDescriptor(functionDescriptor, headerScope, scope, function.typeParameters, trace)
@@ -298,7 +298,7 @@ class FunctionDescriptorResolver(
         val parameterScope = LexicalWritableScope(
                 scope,
                 constructorDescriptor,
-                false, null,
+                false,
                 TraceBasedLocalRedeclarationChecker(trace, overloadChecker),
                 LexicalScopeKind.CONSTRUCTOR_HEADER
         )

compiler/frontend/src/org/jetbrains/kotlin/types/expressions/ExpressionTypingServices.java

@@ -186,7 +186,7 @@ public class ExpressionTypingServices {
         DeclarationDescriptor containingDescriptor = context.scope.getOwnerDescriptor();
         TraceBasedLocalRedeclarationChecker redeclarationChecker
                 = new TraceBasedLocalRedeclarationChecker(context.trace, expressionTypingComponents.overloadChecker);
-        LexicalWritableScope scope = new LexicalWritableScope(context.scope, containingDescriptor, false, null, redeclarationChecker,
+        LexicalWritableScope scope = new LexicalWritableScope(context.scope, containingDescriptor, false, redeclarationChecker,
                                                               LexicalScopeKind.CODE_BLOCK);
 
         KotlinTypeInfo r;

compiler/frontend/src/org/jetbrains/kotlin/types/expressions/ExpressionTypingUtils.java

@@ -86,7 +86,7 @@ public class ExpressionTypingUtils {
             @NotNull LexicalScopeKind scopeKind,
             @NotNull OverloadChecker overloadChecker
     ) {
-        return new LexicalWritableScope(context.scope, context.scope.getOwnerDescriptor(), false, null,
+        return new LexicalWritableScope(context.scope, context.scope.getOwnerDescriptor(), false,
                                         new TraceBasedLocalRedeclarationChecker(context.trace, overloadChecker), scopeKind);
     }
 

compiler/resolution/src/org/jetbrains/kotlin/resolve/scopes/LexicalWritableScope.kt

@@ -25,11 +25,13 @@ class LexicalWritableScope(
         parent: LexicalScope,
         override val ownerDescriptor: DeclarationDescriptor,
         override val isOwnerDescriptorAccessibleByLabel: Boolean,
-        override val implicitReceiver: ReceiverParameterDescriptor?,
         redeclarationChecker: LocalRedeclarationChecker,
         override val kind: LexicalScopeKind
 ) : LexicalScopeStorage(parent, redeclarationChecker) {
 
+    override val implicitReceiver: ReceiverParameterDescriptor?
+        get() = null
+
     private var canWrite: Boolean = true
     private var lastSnapshot: Snapshot? = null
 
@@ -96,4 +98,4 @@ class LexicalWritableScope(
         p.popIndent()
         p.println("}")
     }
-}
+}