The recursion limit for monomorphizations are different than for macro expansions

[Marwes]

Currently the recursion limit for monomorphization is 64 which the toml_edit crate ended up hitting as reported in Marwes/combine#172 . The solution here is to manually specify a higher recursion limit via the recursion_limit attribute.

This does mean that the attribute ends up in a bit of a weird situation though, since recursion_limit also affects macro expansions which has a default value of 1024. So any explicitly set value between 64 and 1024 actually ends up reducing the recursion limit for macros.

I assume that there is a good reason for the monomorphization limit being so low compared to the macro limit. But if that is the case then it is perhaps a bit problematic that any increase of the limit for the sake of macro expansion will actually also end up increasing it for monomorphizations as well, only it is increased by a factor of 20 or more.

...

I don't think there is anything that is actually directly actionable in this issue now that I have written it out. But I figure I should still post this as I did end up being rather confused by the fact that setting the recursion_limit to 1024 actually fixed the issue in toml_edit, despite the fact that I remember it being increased to 1024 some time ago (only when I dug up the issue did I realize it was only for macros)