syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"always_encode_mir:"}]}
source_snippet:     always_encode_mir: bool = (false, parse_bool, [TRACKED],
context_before:         "only allow the listed language features to be enabled in code (comma separated)"),
context_after:         "encode MIR of all functions into the crate metadata (default: no)"),