syntax_data: {"ast_node_type":"function","tokens":[{"end":17,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn new_bound(
context_before: impl<'tcx> rustc_type_ir::inherent::Region<TyCtxt<'tcx>> for Region<'tcx> {
context_after:         interner: TyCtxt<'tcx>,