let try x y = quote! 
    js! "(() => { 
        try {
            return " (unquote! x) ";
        } catch (e) { 
            return (" (unquote! y) ")(e); 
        }
    })()"

let call_later f = quote! js! "setTimeout(() => " (unquote! f) ")"

let inline x = quote! js! "/*@__INLINE__*/ " (unquote! x)

let if x y z = quote! js! "(" (unquote! x) " ? " (unquote! y) " : " (unquote! z) ")"

let for_each x =
    | Statement [Func {Pattern (StructPattern [patt, ipatt]), body}] -> quote! js! "(() => {
        let __x = " (unquote! x) ".slice(1);
        for (let __z = 0; __z < __x.length; __z++) {
            let __y = __x[__z];
            " (unquote! Let {patt, quote! js! "__y"}) ";
            " (unquote! Let {ipatt, quote! js! "__z"}) ";
            " (unquote! body) ";
        }
        })()"
    | Statement [Func {patt, body}] -> quote! js! "(() => {
        for (let __z of " (unquote! x) ".slice(1)) {
            " (unquote! Let {patt, quote! js! "__z"}) ";
            " (unquote! body) ";
        }
        })()"

    | x -> js! "console.log(x)"

let not x = js! "!x"

let do x = x

let flip f x y = f y x

let match x y = quote! js! "(" (unquote! y) ")(" (unquote! x) ")"

let eq = 

    js! "(() => {
        var envHasBigInt64Array = typeof BigInt64Array !== 'undefined';

        return function equal(a, b) {
            if (a === b) {
                return true;
            }

            if (a && b && typeof a == 'object' && typeof b == 'object') {
                if (a.constructor !== b.constructor) {
                    return false;
                }

                var length, i, keys;
                if (Array.isArray(a)) {
                    length = a.length;
                    if (length != b.length) return false;
                    for (i = length; i-- !== 0;)
                        if (!equal(a[i], b[i])) return false;
                    return true;
                }

                if ((a instanceof Map) && (b instanceof Map)) {
                    if (a.size !== b.size) return false;
                    for (i of a.entries())
                        if (!b.has(i[0])) return false;
                    for (i of a.entries())
                        if (!equal(i[1], b.get(i[0]))) return false;
                    return true;
                }

                if ((a instanceof Set) && (b instanceof Set)) {
                    if (a.size !== b.size) return false;
                    for (i of a.entries())
                        if (!b.has(i[0])) return false;
                    return true;
                }

                if (ArrayBuffer.isView(a) && ArrayBuffer.isView(b)) {
                    length = a.length;
                    if (length != b.length) return false;
                    for (i = length; i-- !== 0;)
                        if (a[i] !== b[i]) return false;
                    return true;
                }

                if (a.constructor === RegExp) {
                    return a.source === b.source && a.flags === b.flags;
                }

                if (a.valueOf !== Object.prototype.valueOf) {
                    return a.valueOf() === b.valueOf();
                }

                if (a.toString !== Object.prototype.toString) {
                    return a.toString() === b.toString();
                }

                keys = Object.keys(a);
                length = keys.length;
                if (length !== Object.keys(b).length) {
                    return false;
                }

                for (i = length; i-- !== 0;) {
                    if (!Object.prototype.hasOwnProperty.call(b, keys[i])) {
                        return false;
                    }
                }

                for (i = length; i-- !== 0;) {
                    var key = keys[i];
                    if (!equal(a[key], b[key])) return false;
                }

                return true;
            }
            return a!==a && b!==b;
        };
    })();"