syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"\"emit"}]}
source_snippet:         "emit runtime checks for Undefined Behavior (default: -Cdebug-assertions)"),
context_before:     ub_checks: Option<bool> = (None, parse_opt_bool, [TRACKED],
context_after:     ui_testing: bool = (false, parse_bool, [UNTRACKED],