syntax_data: {"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"\"a"}]}
source_snippet:         "a default MIR inlining threshold (default: 50)"),
context_before:     inline_mir_threshold: Option<usize> = (None, parse_opt_number, [TRACKED],
context_after:     input_stats: bool = (false, parse_bool, [UNTRACKED],