Testing big ints

new_ast.cpp

@@ -55,6 +55,7 @@ struct Parse_Ctx:Lexer{
     syms       = {heap};
     type_map   = {heap};
     local_syms = {heap};
+    bigint_allocator = perm;
 
     lex_init(perm, heap, this);
     keyword_struct= intern("struct"_s);