> PLEASE, do not use top-level break/continue inside statements provided to of and ifLet; use goto labels instead.
Seems like a pretty big footgun. But otherwise, very cool.
Seems like a pretty big footgun. But otherwise, very cool.
I had written a immediate mode UI out of macros, and this reminded me of that although in my case it is not a problem, although some blocks are ones that you can use "break". For example, you can use "break" to exit out of a win_form block ("goto" also works), while a win_command block does not capture "break" so using break (or goto) inside of a win_command block will break out of whatever block the win_command is in (probably a win_form block; for example, this would commonly be used in the case of a "Cancel" button).
So it's not just about being slightly better in some ways, but smoothing over so many paper cuts that it can be hard to see how they have added up overtime across ecosystems, like CPython and co having so many of its own vocab types, or HPC libs.
For example, the problem with this macro that causes this wouldn't even be problems in a well written Rust macro. They're artifacts of smart people trying to work around C's limitations.
But then the macro wouldn't have been written anyway because this is a port of a native Rust feature (which means it gets taken advantage of in community software).