syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"\"force"}]}
source_snippet:         "force all crates to be `rustc_private` unstable (default: no)"),
context_before:     force_unstable_if_unmarked: bool = (false, parse_bool, [TRACKED],
context_after:     function_return: FunctionReturn = (FunctionReturn::default(), parse_function_return, [TRACKED],