syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"opt(Stable,"}]}
source_snippet:         opt(Stable, FlagMulti, "O", "", "Equivalent to -C opt-level=3", ""),
context_before:         opt(Stable, FlagMulti, "g", "", "Equivalent to -C debuginfo=2", ""),
context_after:         opt(Stable, Opt, "o", "", "Write output to FILENAME", "<FILENAME>"),