Calling some user functions directly in bundle code will cause unexpected error

[leeyi45]

Here are some fairly contrived examples of code that will fail at runtime:

with rune (the rune animation errors):

import { animate_rune, heart, stack_frac } from 'rune';

function f(i) {
    return i >= 10 ? heart : stack_frac(1/i, f(i + 1), heart);
}

animate_rune(1, 60, f);

with repl (evaluating any code inside the repl will cause an error):

import { set_evaluator } from 'repl';

function string_length(str) {
    function f(i) {
        return char_at(str, i) === undefined ? i : f(i + 1);
    }
    
    return f(0);
}

function evaller(code) {
    if (string_length(code) === 10) {
        return 0;
    }
    return evaller(code + '');
}

set_evaluator(evaller);

What's happening is that the transpiler does some magic to make tracking recursive calls in user defined functions easier, but it means that functions need to be called using callIfFuncAndRightArgs.

Either that or js-slang's implementation of handling user defined functions needs to change

[leeyi45]

Actually this issue might be a bit more serious than that:

import { twice } from 'repeat';

const f = x => x > 10 ? 10 : f(x + 1);
const g = twice(f);

g(0);

Seems to fail because of a rttc error