syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// synthesize branch instrumentation for the enclosing `!`.
context_before:     /// information that [`Builder::visit_coverage_branch_condition`] can use to
context_after:     pub(crate) fn visit_unary_not(&mut self, thir: &Thir<'_>, unary_not: ExprId) {