syntax_data: {"ast_node_type":"function","tokens":[{"end":82,"kind":"keyword","start":0,"text":"pub(crate)"}]}
source_snippet:     pub(crate) fn visit_unary_not(&mut self, thir: &Thir<'_>, unary_not: ExprId) {
context_before:     /// synthesize branch instrumentation for the enclosing `!`.
context_after:         assert_matches!(thir[unary_not].kind, ExprKind::Unary { op: UnOp::Not, .. });