syntax_data: {"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let crate_types = parse_crate_types_from_list(unparsed_crate_types)
context_before:     let unparsed_crate_types = matches.opt_strs("crate-type");
context_after:         .unwrap_or_else(|e| early_dcx.early_fatal(e));