syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"\"proc-macro\""}]}
source_snippet:                 "proc-macro" => CrateType::ProcMacro,
context_before:                 "bin" => CrateType::Executable,
context_after:                 "sdylib" => CrateType::Sdylib,