Stabilize core::ffi:c_* and rexport in std::ffi

This only stabilizes the base types, not the non-zero variants, since
those have their own separate tracking issue and have not gone through
FCP to stabilize.

library/alloc/src/lib.rs

@@ -108,7 +108,6 @@
 #![feature(const_refs_to_cell)]
 #![feature(core_c_str)]
 #![feature(core_intrinsics)]
-#![feature(core_ffi_c)]
 #![feature(const_eval_select)]
 #![feature(const_pin)]
 #![feature(cstr_from_bytes_until_nul)]

library/alloc/tests/lib.rs

@@ -12,7 +12,6 @@
 #![feature(const_ptr_write)]
 #![feature(const_try)]
 #![feature(core_c_str)]
-#![feature(core_ffi_c)]
 #![feature(core_intrinsics)]
 #![feature(drain_filter)]
 #![feature(exact_size_is_empty)]

library/core/src/ffi/mod.rs

@@ -26,7 +26,7 @@ macro_rules! type_alias_no_nz {
     } => {
         #[doc = include_str!($Docfile)]
         $( $Cfg )*
-        #[unstable(feature = "core_ffi_c", issue = "94501")]
+        #[stable(feature = "core_ffi_c", since = "1.64.0")]
         pub type $Alias = $Real;
     }
 }

library/core/tests/lib.rs

@@ -19,7 +19,6 @@
 #![feature(const_ptr_write)]
 #![feature(const_trait_impl)]
 #![feature(const_likely)]
-#![feature(core_ffi_c)]
 #![feature(core_intrinsics)]
 #![feature(core_private_bignum)]
 #![feature(core_private_diy_float)]

library/std/src/ffi/mod.rs

@@ -168,6 +168,12 @@ pub type FromBytesWithNulError = core::ffi::FromBytesWithNulError;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::os_str::{OsStr, OsString};
 
+#[stable(feature = "core_ffi_c", since = "1.64.0")]
+pub use core::ffi::{
+    c_char, c_double, c_float, c_int, c_long, c_longlong, c_schar, c_short, c_uchar, c_uint,
+    c_ulong, c_ulonglong, c_ushort,
+};
+
 #[stable(feature = "core_c_void", since = "1.30.0")]
 pub use core::ffi::c_void;
 

library/std/src/lib.rs

@@ -315,7 +315,6 @@
 #![feature(cfg_eval)]
 #![feature(concat_bytes)]
 #![feature(const_format_args)]
-#![feature(core_ffi_c)]
 #![feature(core_panic)]
 #![feature(custom_test_frameworks)]
 #![feature(edition_panic)]