Setup MSRV

Drop outdated CI. New CI scripts will follow

Cargo.toml

@@ -9,12 +9,14 @@ homepage = "https://github.com/zakarumych/allocator-api2"
 repository = "https://github.com/zakarumych/allocator-api2"
 readme = "README.md"
 description = "Mirror of Rust's allocator API"
+rust-version = "1.63"
 
 [features]
 alloc = []
 std = ["alloc"]
 default = ["std"]
 nightly = []
+fresh-rust = []
 
 [dependencies]
 serde = { version = "1.0", optional = true }

README.md

@@ -36,6 +36,14 @@ If feature is not provided, your library may not be compatible with the
 rest of the users and cause compilation errors on nightly channel
 when some other crate enables "allocator-api2/nightly" feature.
 
+# Minimal Supported Rust Version (MSRV)
+
+This crate is guaranteed to compile on stable Rust 1.63 and up.
+A feature "fresh-rust" bumps the MSRV to unspecified higher version, but should be compatible with
+at least few latest stable releases. The feature enables some additional functionality:
+
+* `CStr` without "std" feature
+
 ## License
 
 Licensed under either of

src/stable/boxed.rs

@@ -2204,6 +2204,27 @@ impl<A: Allocator> Extend<Box<str, A>> for alloc_crate::string::String {
 }
 
 #[cfg(not(no_global_oom_handling))]
+#[cfg(feature = "std")]
+impl Clone for Box<std::ffi::CStr> {
+    #[inline]
+    fn clone(&self) -> Self {
+        (**self).into()
+    }
+}
+
+#[cfg(not(no_global_oom_handling))]
+#[cfg(feature = "std")]
+impl From<&std::ffi::CStr> for Box<std::ffi::CStr> {
+    /// Converts a `&CStr` into a `Box<CStr>`,
+    /// by copying the contents into a newly allocated [`Box`].
+    fn from(s: &std::ffi::CStr) -> Box<std::ffi::CStr> {
+        let boxed: Box<[u8]> = Box::from(s.to_bytes_with_nul());
+        unsafe { Box::from_raw(Box::into_raw(boxed) as *mut std::ffi::CStr) }
+    }
+}
+
+#[cfg(not(no_global_oom_handling))]
+#[cfg(feature = "fresh-rust")]
 impl Clone for Box<core::ffi::CStr> {
     #[inline]
     fn clone(&self) -> Self {
@@ -2212,6 +2233,7 @@ impl Clone for Box<core::ffi::CStr> {
 }
 
 #[cfg(not(no_global_oom_handling))]
+#[cfg(feature = "fresh-rust")]
 impl From<&core::ffi::CStr> for Box<core::ffi::CStr> {
     /// Converts a `&CStr` into a `Box<CStr>`,
     /// by copying the contents into a newly allocated [`Box`].

src/stable/unique.rs

@@ -77,7 +77,7 @@ impl<T: ?Sized> Unique<T> {
     pub const unsafe fn as_ref(&self) -> &T {
         // SAFETY: the caller must guarantee that `self` meets all the
         // requirements for a reference.
-        unsafe { self.pointer.as_ref() }
+        unsafe { &*(self.as_ptr() as *const T) }
     }
 
     /// Mutably dereferences the content.

tests/Cargo.toml

@@ -1,15 +1,16 @@
 [package]
 name = "allocator-api2-tests"
-version = "0.2.15"
-edition = "2021"
+version = "0.2.19"
+edition = "2018"
 description = "Tests for allocators that implement the allocator API"
 license = "MIT OR Apache-2.0"
 documentation = "https://docs.rs/allocator-api2-tests"
 homepage = "https://github.com/zakarumych/allocator-api2"
 repository = "https://github.com/zakarumych/allocator-api2"
+rust-version = "1.63"
 
 [features]
 nightly = ["allocator-api2/nightly"]
 
 [dependencies]
-allocator-api2 = { version = "=0.2.18", path = ".." }
+allocator-api2 = { version = "=0.2.19", path = ".." }