syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"@call(mir_discriminant,"}]}
source_snippet:             @call(mir_discriminant, args) => self.parse_place(args[0]).map(Rvalue::Discriminant),
context_before:         parse_by_kind!(self, expr_id, expr, "rvalue",
context_after:             @call(mir_cast_transmute, args) => {