syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"opt(Stable,"}]}
source_snippet:         opt(Stable, Flag, "V", "version", "Print version info and exit", ""),
context_before:         opt(Stable, Multi, "C", "codegen", "Set a codegen option", "<OPT>[=<VALUE>]"),
context_after:         opt(Stable, Flag, "v", "verbose", "Use verbose output", ""),