Fix/ignore pure expr

[Davvex87]

Fix for https://discord.com/channels/162395145352904705/1200065966445449286/1473062164435701905

Basically, inline function calls would still append the return expr into the code where the function was called from, even if the program didn't actually want to do anything with that return code, leading to errors in certain languages because the compiler didn't know what to do with them.

Heres an example with lua:

inline function add(arr:Array<T>, val:T):Int
{
  arr.push(val);
  return arr.length - 1;
}

var myArray = ["a", "b", "c"];
add(myArray, "d");

Before the fix:

local myArray = {"a", "b", "c"}
myArray[#myArray + 1] = "d"
#myArray - 1
-- ^^ This is wrong!!

After the fix:

local myArray = {"a", "b", "c"}
myArray[#myArray + 1] = "d"
-- notice how that last line is now gone

This fix also applies for blocks so it should be a universal fix for all situations.

[SomeRanDev]

Instead of having this for block expressions, could we make this preprocessor be for ALL hanging expressions with no side-effects?

Besides that, this is fantastic work!!

[Davvex87]

Well this was hard to implement... but its done!
I did some tests with my reflaxe.lua library and everything worked correctly, hopefully I didn't miss anything.

[SomeRanDev]

Thanks for all the hard work! I didn't realize it would be that much more work 😭

You failed the test_runtime because your code doesn't pass null-safety. You can simply run haxe DevEnv.hxml in your local Reflaxe directory to test this yourself!

[Davvex87]

Implementing the code wasn't even that hard, but understanding and translating the original compiler from ocaml was super time consuming 🥀