syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"\"enable"}]}
source_snippet:         "enable and configure the next generation trait solver used by rustc"),
context_before:     next_solver: NextSolverConfig = (NextSolverConfig::default(), parse_next_solver_config, [TRACKED],
context_after:     nll_facts: bool = (false, parse_bool, [UNTRACKED],