syntax_data: {"ast_node_type":"variable","tokens":[{"end":33,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let len = data.len();
context_before:             let data = byte_sym.as_byte_str();
context_after:             let allocation = tcx.allocate_bytes_dedup(data, CTFE_ALLOC_SALT);