syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"opt(Stable,"}]}
source_snippet:         opt(Stable, Opt, "", "out-dir", "Write output to compiler-chosen filename in DIR", "<DIR>"),
context_before:         opt(Stable, Opt, "o", "", "Write output to FILENAME", "<FILENAME>"),
context_after:         opt(