syntax_data: {"ast_node_type":"impl","tokens":[{"end":89,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Insert an impl into this set of children without comparing to any existing impls.
context_before: impl<'tcx> Children {
context_after:     fn insert_blindly(&mut self, tcx: TyCtxt<'tcx>, impl_def_id: DefId) {