Compile time left fold in D

ctfoldl.d

import std.meta;

auto leftFold(alias F, alias T, Ts...)() {
    auto leftFoldImpl(U, V, Vs...)(U accum, V value, Vs values) {
        static if(values.length == 0)
            return F(accum, value);
        else
            return leftFoldImpl(F(accum, value), values);
    }

    return leftFoldImpl(T, Ts);
}

static assert(leftFold!((a, b) => a + b, 0, 1, 2, 3, 4) == 10);