syntax_data: {"ast_node_type":"other","tokens":[{"end":17,"kind":"keyword","start":0,"text":"{"}]}
source_snippet:                 {
context_before:                     && let Some(len) = ct_len.try_to_target_usize(self.tcx())
context_after:                     match self.tcx().try_get_global_alloc(prov.alloc_id()) {