syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> RelateResult<'tcx, ty::Expr<'tcx>> {
context_before:         be: ty::Expr<'tcx>,
context_after:         // FIXME(generic_const_exprs): is it possible to relate two consts which are not identical