syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"nll_facts:"}]}
source_snippet:     nll_facts: bool = (false, parse_bool, [UNTRACKED],
context_before:         "enable and configure the next generation trait solver used by rustc"),
context_after:         "dump facts from NLL analysis into side files (default: no)"),