There are very few libraries that are nightly-only in Rust. Clippy is a big one, but clippy is a tool, not a library, so it's no big deal (we're working on making it not require a nightly compiler).
Rocket is a recent one. I talked with the owner of Rocket and one of their goals was to help push the boundaries of Rust by playing with the nightly features. With that sort of meta-goal using nightly is sort of a prerequisite. Meh.
You can use almost all of the code generation libs on stable via a build script. Tiny bit more annoying, but if it's a dependency nobody cares. A common pattern is to use nightly for local development (so you get clippy and nicer autocompletion) and make the library still work on stable via syntex so when used as a dependency it just works.
The most used part of the code generation stuff will stabilize in 1.15 so it's mostly not even a problem.
Rocket is a recent one. I talked with the owner of Rocket and one of their goals was to help push the boundaries of Rust by playing with the nightly features. With that sort of meta-goal using nightly is sort of a prerequisite. Meh.
You can use almost all of the code generation libs on stable via a build script. Tiny bit more annoying, but if it's a dependency nobody cares. A common pattern is to use nightly for local development (so you get clippy and nicer autocompletion) and make the library still work on stable via syntex so when used as a dependency it just works.
The most used part of the code generation stuff will stabilize in 1.15 so it's mostly not even a problem.