src/s-reader.js
function expectRE($, regexp) {
    let str = acceptRE($, regexp);
    if (str === null) {
        throw Tools.syntaxError("Unexpected character", $.pos);
    }
    return str;
}
function expectRE($, regexp) {
    let str = acceptRE($, regexp);
    if (str === null) {
        throw Tools.syntaxError("Unexpected character", $.pos);
    }
    return str;
}
function expectRE ( $ , regexp ) { let str = acceptRE ( $ , regexp ) ; if ( str === null ) { throw Tools . syntaxError ( "Unexpected character" , $ . pos ) ; } return str ; }
(object, object) => string
( object object ) = > string