{"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"let"}]}
            let comma = parser.prev_token.span.shrink_to_hi();
        if let token::Literal(token::Lit { kind: token::Str, .. }) = parser.token.kind {
            cx.dcx().emit_err(errors::AssertMissingComma { span: parser.token.span, comma });