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Copyright (c) 2011-2012 Yutaka Saito

### Quoted Value In normal case, when you specify expressions in the argument list of function call, their evaluation results are passed to a function. However, if the function specify an argument symbol prefixed with a backquote character in its declaration, a pre-evaluated expression shall be passed to the function as a Quoted value. The following example creates a function that works just like for statement in C language.
    c_like_for(`init, `cond, `next) {`block} = {
        env = outers()
        env.eval(init)
        while (env.eval(cond)) {
            env.eval(block)
            env.eval(next)
        }
    }

    n = 0
    c_like_for (i = 1, i <= 10, i += 1) {
        n += i
    }
    printf('i = %d, sum = %d\n', i, n)