syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:         match self.try_normalize_generic_arg_after_erasing_regions(c.into()) {
context_before:     fn try_fold_const(&mut self, c: ty::Const<'tcx>) -> Result<ty::Const<'tcx>, Self::Error> {
context_after:             Ok(t) => Ok(t.expect_const()),