syntax_data: {"ast_node_type":"other","tokens":[{"end":27,"kind":"keyword","start":0,"text":"$("}]}
source_snippet:         $( #[$attr:meta] )*
context_before:     ( $( #[$top_level_attr:meta] )* pub struct Options { $(
context_after:         $opt:ident : $t:ty [$dep_tracking_marker:ident $( $tmod:ident $variant:ident )?],