syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"[$non_substruct:ident]"}]}
source_snippet:             [$non_substruct:ident] |
context_before:         @parse {$($eout:tt)*}, ($puser_value:ident){$($pout:tt)*};
context_after:         $($tail:tt)*