{"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"let"}]}
    let source = pprust::crate_to_string_for_macros(krate);
pub fn fake_token_stream_for_crate(psess: &ParseSess, krate: &ast::Crate) -> TokenStream {
    let filename = FileName::macro_expansion_source_code(&source);