"Error in error handling" and Lua 5.4 deprecations

[borbware]

Has something changed in error handling? In 1.2.2997-dev pro i got this error message when running my game, but in 1.2.2883-dev pro everything works normally.

I use Lua, and the relevant code seems to be on line 98 in ldo.c....

[borbware]

hmm, i traced _VERSION and it differs, it used to be Lua 5.3 but now it's Lua 5.4

[borbware]

Okay, I figured something out. The culprit was this cursed function that I used to convert floats to integers:

function makeint(f)
	return string.format("%.0f",f)|0
end

(Luckily, Lua 5.3+ has a function math.tointeger that can be used instead.)

By running makeint(3.0) in the test cart, I actually got a meaningful error message instead of error in error handling:

[string "-- title:   game 
title..."]:15: attempt to perform 
bitwise operation on a string value
stack traceback:
	[C]: in metamethod 'bor'
	[string "-- title:   game 
title..."]:15: in function 'makeint'
	[string "-- title:   game 
title..."]:21: in function 'TIC'

So, my findings are:

1. I guess when the stack is big enough, you don't get descriptive error messages anymore? Can this be fixed?
2. There are some breaking changes in Lua 5.3->Lua 5.4.

This wasn't the only breaking change I found: After resolving this error, I stumbled upon another similar one. I'll continue my investigations, even though it is quite difficult because I can't see which line the error originated from....

[borbware]

Found another deprecation: math.atan2 is deprecated and should be replaced with math.atan that accepts two arguments now. Apparently this was already deprecated in Lua 5.3 but somehow it still worked before 5.4.

Nothing crashes for now, but I'll continue investigations later...

[Miguel-hrvs]

I thought that the difference between 5.3 to 5.4 was smaller. I'll see if I can fix the error handler. We could also discuss if we want to revert to 5.3.