Core: Factor + start defer

core_ast.cpp

@@ -177,6 +177,13 @@ ast_return(Token *pos, Ast_Expr *expr) {
     return result;
 }
 
+CORE_Static Ast_Defer *
+ast_defer(Token *pos, Ast_Scope *scope) {
+    Ast_Defer *result = ast_new(Ast_Defer, AST_DEFER, pos, AST_STMT);
+    result->scope = scope;
+    return result;
+}
+
 CORE_Static Ast_Goto *
 ast_goto(Token *pos, Intern_String label) {
     Ast_Goto *result = ast_new(Ast_Goto, AST_GOTO, pos, AST_STMT);