remove nightly feature

.github/workflows/ci.yml

@@ -29,10 +29,3 @@ jobs:
     - name: Run compile-fail tests
       if: matrix.rust-version == 'stable'
       run: cargo test -- ui_compile_fail
-
-    - name: Build with nightly feature
-      if: matrix.rust-version == 'nightly'
-      run: cargo build --features=nightly
-    - name: Run tests with nightly feature
-      if: matrix.rust-version == 'nightly'
-      run: cargo test --features=nightly -- --skip ui_compile_fail

Cargo.toml

@@ -20,9 +20,6 @@ rust-version = "1.37"
 [lib]
 proc-macro = true
 
-[features]
-nightly = []
-
 [dependencies]
 proc-macro2 = "1.0"
 quote = "1.0"

src/analyze.rs

@@ -92,19 +92,6 @@ pub(crate) fn find_suitable_param_names(trait_def: &ItemTrait) -> (Ident, Lifeti
     (ty_name, lt)
 }
 
-/// On nightly, we use `def_site` hygiene which puts our names into another
-/// universe than the names of the user. This is not strictly required as our
-/// name is already pretty much guaranteed to not conflict with another name,
-/// but this is cleaner and just the correct thing to do.
-#[cfg(feature = "nightly")]
-fn param_span() -> Span2 {
-    crate::proc_macro::Span::def_site().into()
-}
-
-/// On stable, we use `call_site()` hygiene. That means that our names could
-/// theoretically collide with names of the user. But we made sure this doesn't
-/// happen.
-#[cfg(not(feature = "nightly"))]
 fn param_span() -> Span2 {
     Span2::call_site()
 }

src/lib.rs

@@ -202,30 +202,6 @@
 //!     }
 //! }
 //! ```
-//!
-//!
-//! # The `nightly` feature gate
-//!
-//! By default, this crate compiles on stable. If you don't need stable support,
-//! you can enable the `nightly` feature of this crate:
-//!
-//! ```toml
-//! [dependencies]
-//! auto_impl = { version = "*", features = ["nightly"] }
-//! ```
-//!
-//! The nightly feature enables a few additional features that are not
-//! available on stable yet. Currently, you get these advantages:
-//! - All idents generated by auto_impl use the `def_site` hygiene and
-//!   therefore will never ever have name collisions with user written idents.
-//!   Note that `auto_impl` already (even without nightly feature) takes care
-//!   that idents never collide, if possible. But `def_site` hygiene is still
-//!   technically the more correct solution.
-
-#![cfg_attr(
-    feature = "nightly",
-    feature(proc_macro_diagnostic, proc_macro_span, proc_macro_def_site)
-)]
 
 extern crate proc_macro;
 #[macro_use]