Don't discard non-special tokens in macro invocations

[Wilfred]

vec![Foo::bar()];
baz![?];

The :: and ? are not included in the syntax tree. I think this is because _non_special_token is matching these with a regular expression, unlike e.g. as.

tree-sitter-rust/grammar.js

Lines 193 to 198 in cc7bdd3

	_non_special_token: $ => choice(
	$._literal, $.identifier, $.metavariable, $.mutable_specifier, $.self, $.super, $.crate,
	alias(choice(...primitive_types), $.primitive_type),
	/[/_\-=->,;:::!=?.@*&#%^+<>|~]+/,
	'\'',
	'as', 'async', 'await', 'break', 'const', 'continue', 'default', 'enum', 'fn', 'for', 'if', 'impl',

This is causing issues for difftastic, where Foo::bar() preserves the :: but vec![Foo::bar()] does not.

[Wilfred]

Related: tree-sitter/tree-sitter#1151

[amaanq]

I'm hoping this is fixed on master/0.20.4, try it out!

But a good idea might be to just inject Rust inside a macro's token tree