syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"\"emit"}]}
source_snippet:         "emit noalias metadata for mutable references (default: yes)"),
context_before:     mutable_noalias: bool = (true, parse_bool, [TRACKED],
context_after:     namespaced_crates: bool = (false, parse_bool, [TRACKED],