[ASTGen] Handle the 'Any' type

Author: DougGregor

include/swift/AST/CASTBridging.h

@@ -282,6 +282,7 @@ void *MemberTypeRepr_create(void *ctx, void *baseComponent,
 void *GenericIdentTypeRepr_create(void *ctx, BridgedIdentifier name,
                                   void *nameLoc, BridgedArrayRef genericArgs,
                                   void *lAngle, void *rAngle);
+void *EmptyCompositionTypeRepr_create(void *ctx, void *anyLoc);
 void *CompositionTypeRepr_create(void *ctx, BridgedArrayRef types,
                                  void *firstTypeLoc);
 void *FunctionTypeRepr_create(void *ctx, void *argsTy, void *_Nullable asyncLoc,

lib/AST/CASTBridging.cpp

@@ -542,6 +542,12 @@ void *MemberTypeRepr_create(void *ctx, void *baseComponent,
                                 memberComponents);
 }
 
+void *EmptyCompositionTypeRepr_create(void *ctx, void *anyLocPtr) {
+  ASTContext &Context = *static_cast<ASTContext *>(ctx);
+  SourceLoc anyLoc = getSourceLocFromPointer(anyLocPtr);
+  return CompositionTypeRepr::createEmptyComposition(Context, anyLoc);
+}
+
 void *CompositionTypeRepr_create(void *ctx, BridgedArrayRef types,
                                  void *firstTypeLoc) {
   ASTContext &Context = *static_cast<ASTContext *>(ctx);

lib/ASTGen/Sources/ASTGen/Types.swift

@@ -6,6 +6,11 @@ extension ASTGenVisitor {
   public func visit(_ node: SimpleTypeIdentifierSyntax) -> ASTNode {
     let loc = self.base.advanced(by: node.position.utf8Offset).raw
 
+    // If this is the bare 'Any' keyword, produce an empty composition type.
+    if node.name.tokenKind == .keyword(.Any) && node.genericArgumentClause == nil {
+      return .type(EmptyCompositionTypeRepr_create(self.ctx, loc))
+    }
+
     var text = node.name.text
     let id = text.withUTF8 { buf in
       return SwiftASTContext_getIdentifier(ctx, buf.baseAddress, buf.count)

test/ASTGen/verify-parse.swift

@@ -45,3 +45,5 @@ func test7(_ b: inout Bool) {
 
 func test8(_ i: _const Int) {
 }
+
+func test9(_ value: Any) { }