[BUG] `EVAL` throws errors in macro factories

[Nico314159]

Describe the bug [A clear and concise description of what the bug is.]

When using #define, defining another macro factory in terms of EVAL expressions results in a parsing error.

To Reproduce [Steps to reproduce the behavior]

1. Write the following code in a .hjmc file:

   #define SCALE 480
   #bind EVAL
   #define Units(x) EVAL((x * SCALE) \ 1)

2. Use jmc compile
3. Read the error message that appears in console.

Expected behavior [A clear and concise description of what you expected to happen.]

I expect that the code would compile without error, and that if something like Units(1.5) appeared in the main code, it would be automatically replaced with 720

Actual behavior

I get the following error.

EvaluationException
Unable to evaluate expression '(x * 480)\1'`

Desktop

• Can replicate on both my 2020 M1 MacBook Air and my 2022 M2 MacBook Air, running MacOS Sonoma

[WingedSeal]

This is a problem in __parse_header which it tries to parse line #define Units(x) EVAL((x * SCALE) \ 1) then tries to evaluate EVAL((x * SCALE) \ 1) first which obviously fails. Parsing header depends on the tokenizer which completely parse out the replacement tokens for define first. A possible solution is to hoist binding EVAL to the last stage of parsing header somehow, then apply it back again somehow. I'll look into this later.