Used parser extension specification

[NTSFka]

The language is designed to support parser extensions which can add custom declaration types, statement types etc. Enabling globally outside file might be a bad idea.

The source file can have top level statement which adds parser extension to the parser and those extensions can be used later in the source.

use shard.builtin;
use shard.web;

The keyword might be different. The parser extension can be even defined in Shard file in some way without extending the parser in C++.

[NTSFka]

Parser extensions use same syntax for modules import. So the module can contain parser extension.