build: simplify use of nightly features

Cargo.toml

@@ -37,6 +37,7 @@ macrotest = "1.0"
 prettyplease = { version = "0.2.37", features = ["verbatim"] }
 
 [lints.rust]
+stable_features = "allow"
 non_ascii_idents = "deny"
 unexpected_cfgs = { level = "warn", check-cfg = [
     'cfg(UI_TESTS)',

build.rs

@@ -1,18 +1,17 @@
-use rustc_version::{version, Version};
+use rustc_version::{version_meta, Channel, Version};
 
 fn main() {
-    println!("cargo::rustc-check-cfg=cfg(RUSTC_LINT_REASONS_IS_STABLE)");
-    println!("cargo::rustc-check-cfg=cfg(RUSTC_NEW_UNINIT_IS_STABLE)");
+    println!("cargo::rustc-check-cfg=cfg(RUSTC_USE_FEATURE)");
     println!("cargo::rustc-check-cfg=cfg(CONFIG_RUSTC_HAS_UNSAFE_PINNED)");
-    if version().unwrap() >= Version::parse("1.81.0").unwrap()
-        || version().unwrap() >= Version::parse("1.81.0-nightly").unwrap()
-    {
-        println!("cargo:rustc-cfg=RUSTC_LINT_REASONS_IS_STABLE");
-    }
-    if version().unwrap() >= Version::parse("1.82.0").unwrap() {
-        println!("cargo:rustc-cfg=RUSTC_NEW_UNINIT_IS_STABLE");
+
+    let meta = version_meta().unwrap();
+
+    let use_feature = meta.channel == Channel::Nightly || std::env::var("RUSTC_BOOTSTRAP").is_ok();
+    if use_feature {
+        println!("cargo:rustc-cfg=RUSTC_USE_FEATURE");
     }
-    if version().unwrap() >= Version::parse("1.89.0-nightly").unwrap() {
+
+    if meta.semver >= Version::parse("1.89.0-nightly").unwrap() && use_feature {
         println!("cargo:rustc-cfg=CONFIG_RUSTC_HAS_UNSAFE_PINNED");
     }
 }

examples/linked_list.rs

@@ -2,7 +2,7 @@
 
 #![allow(clippy::undocumented_unsafe_blocks)]
 #![cfg_attr(feature = "alloc", feature(allocator_api))]
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 
 use core::{
     cell::Cell,

examples/mutex.rs

@@ -2,7 +2,7 @@
 
 #![allow(clippy::undocumented_unsafe_blocks)]
 #![cfg_attr(feature = "alloc", feature(allocator_api))]
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 #![allow(clippy::missing_safety_doc)]
 
 use core::{

examples/pthread_mutex.rs

@@ -3,7 +3,7 @@
 // inspired by <https://github.com/nbdd0121/pin-init/blob/trunk/examples/pthread_mutex.rs>
 #![allow(clippy::undocumented_unsafe_blocks)]
 #![cfg_attr(feature = "alloc", feature(allocator_api))]
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 
 #[cfg(not(windows))]
 mod pthread_mtx {

examples/static_init.rs

@@ -2,7 +2,7 @@
 
 #![allow(clippy::undocumented_unsafe_blocks)]
 #![cfg_attr(feature = "alloc", feature(allocator_api))]
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 #![allow(unused_imports)]
 
 use core::{

internal/Cargo.toml

@@ -21,4 +21,5 @@ syn = { version = "2.0.86", features = ["full", "parsing", "visit-mut"] }
 rustc_version = "0.4"
 
 [lints.rust]
+stable_features = "allow"
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(kernel)'] }

internal/build.rs

@@ -1,10 +1,12 @@
-use rustc_version::{version, Version};
+use rustc_version::{version_meta, Channel};
 
 fn main() {
-    println!("cargo::rustc-check-cfg=cfg(RUSTC_LINT_REASONS_IS_STABLE)");
-    if version().unwrap() >= Version::parse("1.81.0").unwrap()
-        || version().unwrap() >= Version::parse("1.81.0-nightly").unwrap()
-    {
-        println!("cargo:rustc-cfg=RUSTC_LINT_REASONS_IS_STABLE");
+    println!("cargo::rustc-check-cfg=cfg(RUSTC_USE_FEATURE)");
+
+    let meta = version_meta().unwrap();
+
+    let use_feature = meta.channel == Channel::Nightly || std::env::var("RUSTC_BOOTSTRAP").is_ok();
+    if use_feature {
+        println!("cargo:rustc-cfg=RUSTC_USE_FEATURE");
     }
 }

internal/src/lib.rs

@@ -6,7 +6,7 @@
 
 //! `pin-init` proc macros.
 
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 // Documentation is done in the pin-init crate instead.
 #![allow(missing_docs)]
 

src/lib.rs

@@ -264,12 +264,9 @@
 //! [`impl Init<T, E>`]: crate::Init
 //! [Rust-for-Linux]: https://rust-for-linux.com/
 
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 #![cfg_attr(
-    all(
-        any(feature = "alloc", feature = "std"),
-        not(RUSTC_NEW_UNINIT_IS_STABLE)
-    ),
+    all(any(feature = "alloc", feature = "std"), RUSTC_USE_FEATURE),
     feature(new_uninit)
 )]
 #![forbid(missing_docs, unsafe_op_in_unsafe_fn)]

tests/alloc_fail.rs

@@ -1,5 +1,5 @@
 #![cfg_attr(feature = "alloc", feature(allocator_api))]
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 
 #[test]
 #[cfg(feature = "alloc")]

tests/cfgs.rs

@@ -1,4 +1,4 @@
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 
 use pin_init::{pin_data, pin_init, PinInit};
 

tests/const-generic-default.rs

@@ -1,4 +1,4 @@
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 
 use pin_init::*;
 

tests/init-scope.rs

@@ -1,5 +1,5 @@
 #![allow(dead_code)]
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 
 use pin_init::*;
 

tests/many_generics.rs

@@ -1,4 +1,4 @@
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 #![allow(dead_code)]
 
 use core::{marker::PhantomPinned, pin::Pin};

tests/ring_buf.rs

@@ -1,5 +1,5 @@
 #![allow(clippy::undocumented_unsafe_blocks)]
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 #![cfg_attr(feature = "alloc", feature(allocator_api))]
 
 #[cfg(all(not(feature = "std"), feature = "alloc"))]

tests/ui.rs

@@ -1,4 +1,4 @@
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 
 #[test]
 #[cfg_attr(not(UI_TESTS), ignore)]

tests/ui/compile-fail/pin_data/no_pin_on_phantompinned.stderr

@@ -21,26 +21,3 @@ error: The field `pin4` of type `PhantomPinned` only has an effect if it has the
   |
 9 |     pin4: ::core::marker::PhantomPinned,
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-error[E0425]: cannot find type `PhantomPinned` in this scope
- --> tests/ui/compile-fail/pin_data/no_pin_on_phantompinned.rs:6:11
-  |
-6 |     pin1: PhantomPinned,
-  |           ^^^^^^^^^^^^^ not found in this scope
-  |
-help: consider importing this struct
-  |
-1 + use std::marker::PhantomPinned;
-  |
-
-error[E0433]: failed to resolve: use of unresolved module or unlinked crate `marker`
- --> tests/ui/compile-fail/pin_data/no_pin_on_phantompinned.rs:7:11
-  |
-7 |     pin2: marker::PhantomPinned,
-  |           ^^^^^^ use of unresolved module or unlinked crate `marker`
-  |
-  = help: if you wanted to use a crate named `marker`, use `cargo add marker` to add it to your `Cargo.toml`
-help: consider importing this module
-  |
-1 + use std::marker;
-  |

tests/ui/expand/many_generics.expanded.rs

@@ -1,4 +1,3 @@
-#![feature(lint_reasons)]
 #![allow(dead_code)]
 use core::{marker::PhantomPinned, pin::Pin};
 use pin_init::*;

tests/zeroing.rs

@@ -1,4 +1,4 @@
-#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
+#![cfg_attr(RUSTC_USE_FEATURE, feature(lint_reasons))]
 
 use core::{marker::PhantomPinned, ptr::addr_of_mut};