feat: 枚举关联数据 ADT — enum Option { Some(i64), None }

src/ast/ast.c

@@ -200,19 +200,23 @@ AstNode* ast_make_type_alias(void* alloc, const char* name, TypeKind aliased,
 // === 枚举相关工厂函数 ===
 
 AstNode* ast_make_enum_decl(void* alloc, const char* name, const char** variants,
-                              size_t count, SourceLoc loc) {
+                             TypeKind* payload_types, const char** payload_struct_names,
+                             size_t count, SourceLoc loc) {
     NEW(alloc, AST_ENUM_DECL);
     n->as.enum_decl.name = name;
     n->as.enum_decl.variants = variants;
+    n->as.enum_decl.variant_payload_types = payload_types;
+    n->as.enum_decl.variant_payload_struct_names = payload_struct_names;
     n->as.enum_decl.variant_count = count;
     return n;
 }
 
 AstNode* ast_make_enum_variant(void* alloc, const char* enum_name,
-                                 const char* variant_name, SourceLoc loc) {
+                                 const char* variant_name, AstNode* payload, SourceLoc loc) {
     NEW(alloc, AST_ENUM_VARIANT);
     n->as.enum_variant.enum_name = enum_name;
     n->as.enum_variant.variant_name = variant_name;
+    n->as.enum_variant.payload = payload;
     n->as.enum_variant.variant_index = -1;
     return n;
 }