syntax_data: {"ast_node_type":"function","tokens":[{"end":71,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn upcast_from(from: ClauseKind<'tcx>, tcx: TyCtxt<'tcx>) -> Self {
context_before: impl<'tcx> UpcastFrom<TyCtxt<'tcx>, ClauseKind<'tcx>> for Clause<'tcx> {
context_after:         tcx.mk_predicate(ty::Binder::dummy(PredicateKind::Clause(from))).expect_clause()