syntax_data: {"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":"macro_rules!"}]}
source_snippet: macro_rules! options {
context_before: /// hand-written parsers for parsing specific types of values in this module.
context_after:     ($struct_name:ident, $tmod_enum_name:ident, $stat:ident, $optmod:ident, $prefix:expr, $outputname:expr,