mirror of https://github.com/rust-lang/rust.git
Put the RFC behind a feature gate `result_ffi_guarantees`
This commit is contained in:
Arvind Mukund
parent
437ca26de5
commit
ed532cc186
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@ -585,6 +585,9 @@ declare_features! (
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(incomplete, repr128, "1.16.0", Some(56071)),
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/// Allows `repr(simd)` and importing the various simd intrinsics.
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(unstable, repr_simd, "1.4.0", Some(27731)),
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/// Allows enums like Result<T, E> to be used across FFI, if T's niche value can
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/// be used to describe E or vise-versa.
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(unstable, result_ffi_guarantees, "CURRENT_RUSTC_VERSION", Some(110503)),
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/// Allows bounding the return type of AFIT/RPITIT.
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(incomplete, return_type_notation, "1.70.0", Some(109417)),
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/// Allows `extern "rust-cold"`.
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@ -1142,6 +1142,10 @@ pub(crate) fn repr_nullable_ptr<'tcx>(
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[var_one, var_two] => match (&var_one.fields.raw[..], &var_two.fields.raw[..]) {
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([], [field]) | ([field], []) => field.ty(tcx, args),
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([field1], [field2]) => {
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if !tcx.features().result_ffi_guarantees {
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return None;
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}
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let ty1 = field1.ty(tcx, args);
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let ty2 = field2.ty(tcx, args);
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@ -1509,6 +1509,7 @@ symbols! {
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require,
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residual,
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result,
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result_ffi_guarantees,
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resume,
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return_position_impl_trait_in_trait,
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return_type_notation,
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@ -0,0 +1,14 @@
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# `result_ffi_guarantees`
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The tracking issue for this feature is: [#110503]
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[#110503]: https://github.com/rust-lang/rust/issues/110503
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------------------------
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This feature adds the possibility of using `Result<T, E>` in FFI if T's niche
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value can be used to describe E or vise-versa.
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See [RFC 3391] for more information.
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[RFC 3391]: https://github.com/rust-lang/rfcs/blob/master/text/3391-result_ffi_guarantees.md
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@ -0,0 +1,99 @@
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#![allow(dead_code)]
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#![deny(improper_ctypes)]
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#![feature(ptr_internals)]
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use std::num;
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enum Z {}
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#[repr(transparent)]
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struct TransparentStruct<T>(T, std::marker::PhantomData<Z>);
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#[repr(transparent)]
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enum TransparentEnum<T> {
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Variant(T, std::marker::PhantomData<Z>),
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}
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struct NoField;
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extern "C" {
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fn result_ref_t(x: Result<&'static u8, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_fn_t(x: Result<extern "C" fn(), ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonnull_t(x: Result<std::ptr::NonNull<u8>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_unique_t(x: Result<std::ptr::Unique<u8>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_u8_t(x: Result<num::NonZero<u8>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_u16_t(x: Result<num::NonZero<u16>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_u32_t(x: Result<num::NonZero<u32>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_u64_t(x: Result<num::NonZero<u64>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_usize_t(x: Result<num::NonZero<usize>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_i8_t(x: Result<num::NonZero<i8>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_i16_t(x: Result<num::NonZero<i16>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_i32_t(x: Result<num::NonZero<i32>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_i64_t(x: Result<num::NonZero<i64>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_isize_t(x: Result<num::NonZero<isize>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_transparent_struct_t(x: Result<TransparentStruct<num::NonZero<u8>>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_transparent_enum_t(x: Result<TransparentEnum<num::NonZero<u8>>, ()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_phantom_t(x: Result<num::NonZero<u8>, std::marker::PhantomData<()>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_1zst_exhaustive_no_variant_t(x: Result<num::NonZero<u8>, Z>);
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//~^ ERROR `extern` block uses type `Result
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fn result_1zst_exhaustive_no_field_t(x: Result<num::NonZero<u8>, NoField>);
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//~^ ERROR `extern` block uses type `Result
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fn result_ref_e(x: Result<(), &'static u8>);
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//~^ ERROR `extern` block uses type `Result
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fn result_fn_e(x: Result<(), extern "C" fn()>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonnull_e(x: Result<(), std::ptr::NonNull<u8>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_unique_e(x: Result<(), std::ptr::Unique<u8>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_u8_e(x: Result<(), num::NonZero<u8>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_u16_e(x: Result<(), num::NonZero<u16>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_u32_e(x: Result<(), num::NonZero<u32>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_u64_e(x: Result<(), num::NonZero<u64>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_usize_e(x: Result<(), num::NonZero<usize>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_i8_e(x: Result<(), num::NonZero<i8>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_i16_e(x: Result<(), num::NonZero<i16>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_i32_e(x: Result<(), num::NonZero<i32>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_i64_e(x: Result<(), num::NonZero<i64>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_nonzero_isize_e(x: Result<(), num::NonZero<isize>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_transparent_struct_e(x: Result<(), TransparentStruct<num::NonZero<u8>>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_transparent_enum_e(x: Result<(), TransparentEnum<num::NonZero<u8>>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_phantom_e(x: Result<num::NonZero<u8>, std::marker::PhantomData<()>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_1zst_exhaustive_no_variant_e(x: Result<Z, num::NonZero<u8>>);
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//~^ ERROR `extern` block uses type `Result
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fn result_1zst_exhaustive_no_field_e(x: Result<NoField, num::NonZero<u8>>);
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//~^ ERROR `extern` block uses type `Result
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}
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pub fn main() {}
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@ -0,0 +1,349 @@
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error: `extern` block uses type `Result<&u8, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:20:24
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LL | fn result_ref_t(x: Result<&'static u8, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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note: the lint level is defined here
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--> $DIR/feature-gate-result_ffi_guarantees.rs:2:9
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LL | #![deny(improper_ctypes)]
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| ^^^^^^^^^^^^^^^
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error: `extern` block uses type `Result<extern "C" fn(), ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:22:23
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LL | fn result_fn_t(x: Result<extern "C" fn(), ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonNull<u8>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:24:28
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LL | fn result_nonnull_t(x: Result<std::ptr::NonNull<u8>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<Unique<u8>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:26:27
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LL | fn result_unique_t(x: Result<std::ptr::Unique<u8>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<u8>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:28:31
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LL | fn result_nonzero_u8_t(x: Result<num::NonZero<u8>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<u16>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:30:32
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LL | fn result_nonzero_u16_t(x: Result<num::NonZero<u16>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<u32>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:32:32
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LL | fn result_nonzero_u32_t(x: Result<num::NonZero<u32>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<u64>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:34:32
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LL | fn result_nonzero_u64_t(x: Result<num::NonZero<u64>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<usize>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:36:34
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LL | fn result_nonzero_usize_t(x: Result<num::NonZero<usize>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<i8>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:38:31
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LL | fn result_nonzero_i8_t(x: Result<num::NonZero<i8>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<i16>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:40:32
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LL | fn result_nonzero_i16_t(x: Result<num::NonZero<i16>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<i32>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:42:32
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LL | fn result_nonzero_i32_t(x: Result<num::NonZero<i32>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<i64>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:44:32
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LL | fn result_nonzero_i64_t(x: Result<num::NonZero<i64>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<isize>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:46:34
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LL | fn result_nonzero_isize_t(x: Result<num::NonZero<isize>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<TransparentStruct<NonZero<u8>>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:48:39
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LL | fn result_transparent_struct_t(x: Result<TransparentStruct<num::NonZero<u8>>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<TransparentEnum<NonZero<u8>>, ()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:50:37
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LL | fn result_transparent_enum_t(x: Result<TransparentEnum<num::NonZero<u8>>, ()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<u8>, PhantomData<()>>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:52:28
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LL | fn result_phantom_t(x: Result<num::NonZero<u8>, std::marker::PhantomData<()>>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<u8>, Z>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:54:47
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LL | fn result_1zst_exhaustive_no_variant_t(x: Result<num::NonZero<u8>, Z>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<NonZero<u8>, NoField>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:56:45
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LL | fn result_1zst_exhaustive_no_field_t(x: Result<num::NonZero<u8>, NoField>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<(), &u8>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:59:24
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LL | fn result_ref_e(x: Result<(), &'static u8>);
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| ^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `Result<(), extern "C" fn()>`, which is not FFI-safe
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--> $DIR/feature-gate-result_ffi_guarantees.rs:61:23
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LL | fn result_fn_e(x: Result<(), extern "C" fn()>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonNull<u8>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:63:28
|
||||
|
|
||||
LL | fn result_nonnull_e(x: Result<(), std::ptr::NonNull<u8>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), Unique<u8>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:65:27
|
||||
|
|
||||
LL | fn result_unique_e(x: Result<(), std::ptr::Unique<u8>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonZero<u8>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:67:31
|
||||
|
|
||||
LL | fn result_nonzero_u8_e(x: Result<(), num::NonZero<u8>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonZero<u16>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:69:32
|
||||
|
|
||||
LL | fn result_nonzero_u16_e(x: Result<(), num::NonZero<u16>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonZero<u32>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:71:32
|
||||
|
|
||||
LL | fn result_nonzero_u32_e(x: Result<(), num::NonZero<u32>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonZero<u64>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:73:32
|
||||
|
|
||||
LL | fn result_nonzero_u64_e(x: Result<(), num::NonZero<u64>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonZero<usize>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:75:34
|
||||
|
|
||||
LL | fn result_nonzero_usize_e(x: Result<(), num::NonZero<usize>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonZero<i8>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:77:31
|
||||
|
|
||||
LL | fn result_nonzero_i8_e(x: Result<(), num::NonZero<i8>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonZero<i16>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:79:32
|
||||
|
|
||||
LL | fn result_nonzero_i16_e(x: Result<(), num::NonZero<i16>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonZero<i32>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:81:32
|
||||
|
|
||||
LL | fn result_nonzero_i32_e(x: Result<(), num::NonZero<i32>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonZero<i64>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:83:32
|
||||
|
|
||||
LL | fn result_nonzero_i64_e(x: Result<(), num::NonZero<i64>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), NonZero<isize>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:85:34
|
||||
|
|
||||
LL | fn result_nonzero_isize_e(x: Result<(), num::NonZero<isize>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), TransparentStruct<NonZero<u8>>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:87:39
|
||||
|
|
||||
LL | fn result_transparent_struct_e(x: Result<(), TransparentStruct<num::NonZero<u8>>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), TransparentEnum<NonZero<u8>>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:89:37
|
||||
|
|
||||
LL | fn result_transparent_enum_e(x: Result<(), TransparentEnum<num::NonZero<u8>>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<NonZero<u8>, PhantomData<()>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:91:28
|
||||
|
|
||||
LL | fn result_phantom_e(x: Result<num::NonZero<u8>, std::marker::PhantomData<()>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<Z, NonZero<u8>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:93:47
|
||||
|
|
||||
LL | fn result_1zst_exhaustive_no_variant_e(x: Result<Z, num::NonZero<u8>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<NoField, NonZero<u8>>`, which is not FFI-safe
|
||||
--> $DIR/feature-gate-result_ffi_guarantees.rs:95:45
|
||||
|
|
||||
LL | fn result_1zst_exhaustive_no_field_e(x: Result<NoField, num::NonZero<u8>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
|
||||
error: aborting due to 38 previous errors
|
||||
|
||||
|
|
@ -2,6 +2,7 @@
|
|||
#![deny(improper_ctypes)]
|
||||
#![feature(ptr_internals)]
|
||||
#![feature(transparent_unions)]
|
||||
#![feature(result_ffi_guarantees)]
|
||||
|
||||
use std::num;
|
||||
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
error: `extern` block uses type `U`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:68:14
|
||||
--> $DIR/lint-ctypes-enum.rs:69:14
|
||||
|
|
||||
LL | fn uf(x: U);
|
||||
| ^ not FFI-safe
|
||||
|
|
@ -7,7 +7,7 @@ LL | fn uf(x: U);
|
|||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
note: the type is defined here
|
||||
--> $DIR/lint-ctypes-enum.rs:9:1
|
||||
--> $DIR/lint-ctypes-enum.rs:10:1
|
||||
|
|
||||
LL | enum U {
|
||||
| ^^^^^^
|
||||
|
|
@ -18,7 +18,7 @@ LL | #![deny(improper_ctypes)]
|
|||
| ^^^^^^^^^^^^^^^
|
||||
|
||||
error: `extern` block uses type `B`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:69:14
|
||||
--> $DIR/lint-ctypes-enum.rs:70:14
|
||||
|
|
||||
LL | fn bf(x: B);
|
||||
| ^ not FFI-safe
|
||||
|
|
@ -26,13 +26,13 @@ LL | fn bf(x: B);
|
|||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
note: the type is defined here
|
||||
--> $DIR/lint-ctypes-enum.rs:12:1
|
||||
--> $DIR/lint-ctypes-enum.rs:13:1
|
||||
|
|
||||
LL | enum B {
|
||||
| ^^^^^^
|
||||
|
||||
error: `extern` block uses type `T`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:70:14
|
||||
--> $DIR/lint-ctypes-enum.rs:71:14
|
||||
|
|
||||
LL | fn tf(x: T);
|
||||
| ^ not FFI-safe
|
||||
|
|
@ -40,13 +40,13 @@ LL | fn tf(x: T);
|
|||
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
|
||||
= note: enum has no representation hint
|
||||
note: the type is defined here
|
||||
--> $DIR/lint-ctypes-enum.rs:16:1
|
||||
--> $DIR/lint-ctypes-enum.rs:17:1
|
||||
|
|
||||
LL | enum T {
|
||||
| ^^^^^^
|
||||
|
||||
error: `extern` block uses type `u128`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:82:31
|
||||
--> $DIR/lint-ctypes-enum.rs:83:31
|
||||
|
|
||||
LL | fn option_nonzero_u128(x: Option<num::NonZero<u128>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -54,7 +54,7 @@ LL | fn option_nonzero_u128(x: Option<num::NonZero<u128>>);
|
|||
= note: 128-bit integers don't currently have a known stable ABI
|
||||
|
||||
error: `extern` block uses type `i128`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:89:31
|
||||
--> $DIR/lint-ctypes-enum.rs:90:31
|
||||
|
|
||||
LL | fn option_nonzero_i128(x: Option<num::NonZero<i128>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -62,7 +62,7 @@ LL | fn option_nonzero_i128(x: Option<num::NonZero<i128>>);
|
|||
= note: 128-bit integers don't currently have a known stable ABI
|
||||
|
||||
error: `extern` block uses type `Option<TransparentUnion<NonZero<u8>>>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:94:36
|
||||
--> $DIR/lint-ctypes-enum.rs:95:36
|
||||
|
|
||||
LL | fn option_transparent_union(x: Option<TransparentUnion<num::NonZero<u8>>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -71,7 +71,7 @@ LL | fn option_transparent_union(x: Option<TransparentUnion<num::NonZero<u8>
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Option<Rust<NonZero<u8>>>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:96:28
|
||||
--> $DIR/lint-ctypes-enum.rs:97:28
|
||||
|
|
||||
LL | fn option_repr_rust(x: Option<Rust<num::NonZero<u8>>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -80,7 +80,7 @@ LL | fn option_repr_rust(x: Option<Rust<num::NonZero<u8>>>);
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `u128`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:106:33
|
||||
--> $DIR/lint-ctypes-enum.rs:107:33
|
||||
|
|
||||
LL | fn result_nonzero_u128_t(x: Result<num::NonZero<u128>, ()>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -88,7 +88,7 @@ LL | fn result_nonzero_u128_t(x: Result<num::NonZero<u128>, ()>);
|
|||
= note: 128-bit integers don't currently have a known stable ABI
|
||||
|
||||
error: `extern` block uses type `i128`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:113:33
|
||||
--> $DIR/lint-ctypes-enum.rs:114:33
|
||||
|
|
||||
LL | fn result_nonzero_i128_t(x: Result<num::NonZero<i128>, ()>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -96,7 +96,7 @@ LL | fn result_nonzero_i128_t(x: Result<num::NonZero<i128>, ()>);
|
|||
= note: 128-bit integers don't currently have a known stable ABI
|
||||
|
||||
error: `extern` block uses type `Result<TransparentUnion<NonZero<u8>>, ()>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:118:38
|
||||
--> $DIR/lint-ctypes-enum.rs:119:38
|
||||
|
|
||||
LL | fn result_transparent_union_t(x: Result<TransparentUnion<num::NonZero<u8>>, ()>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -105,7 +105,7 @@ LL | fn result_transparent_union_t(x: Result<TransparentUnion<num::NonZero<u
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<Rust<NonZero<u8>>, ()>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:120:30
|
||||
--> $DIR/lint-ctypes-enum.rs:121:30
|
||||
|
|
||||
LL | fn result_repr_rust_t(x: Result<Rust<num::NonZero<u8>>, ()>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -114,7 +114,7 @@ LL | fn result_repr_rust_t(x: Result<Rust<num::NonZero<u8>>, ()>);
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<NonZero<u8>, U>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:124:51
|
||||
--> $DIR/lint-ctypes-enum.rs:125:51
|
||||
|
|
||||
LL | fn result_1zst_exhaustive_single_variant_t(x: Result<num::NonZero<u8>, U>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -123,7 +123,7 @@ LL | fn result_1zst_exhaustive_single_variant_t(x: Result<num::NonZero<u8>,
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<NonZero<u8>, B>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:126:53
|
||||
--> $DIR/lint-ctypes-enum.rs:127:53
|
||||
|
|
||||
LL | fn result_1zst_exhaustive_multiple_variant_t(x: Result<num::NonZero<u8>, B>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -132,7 +132,7 @@ LL | fn result_1zst_exhaustive_multiple_variant_t(x: Result<num::NonZero<u8>
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<NonZero<u8>, NonExhaustive>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:128:51
|
||||
--> $DIR/lint-ctypes-enum.rs:129:51
|
||||
|
|
||||
LL | fn result_1zst_non_exhaustive_no_variant_t(x: Result<num::NonZero<u8>, NonExhaustive>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -141,7 +141,7 @@ LL | fn result_1zst_non_exhaustive_no_variant_t(x: Result<num::NonZero<u8>,
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<NonZero<u8>, Field>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:131:49
|
||||
--> $DIR/lint-ctypes-enum.rs:132:49
|
||||
|
|
||||
LL | fn result_1zst_exhaustive_single_field_t(x: Result<num::NonZero<u8>, Field>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -150,7 +150,7 @@ LL | fn result_1zst_exhaustive_single_field_t(x: Result<num::NonZero<u8>, Fi
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<Result<(), NonZero<u8>>, ()>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:133:30
|
||||
--> $DIR/lint-ctypes-enum.rs:134:30
|
||||
|
|
||||
LL | fn result_cascading_t(x: Result<Result<(), num::NonZero<u8>>, ()>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -159,7 +159,7 @@ LL | fn result_cascading_t(x: Result<Result<(), num::NonZero<u8>>, ()>);
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `u128`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:144:33
|
||||
--> $DIR/lint-ctypes-enum.rs:145:33
|
||||
|
|
||||
LL | fn result_nonzero_u128_e(x: Result<(), num::NonZero<u128>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -167,7 +167,7 @@ LL | fn result_nonzero_u128_e(x: Result<(), num::NonZero<u128>>);
|
|||
= note: 128-bit integers don't currently have a known stable ABI
|
||||
|
||||
error: `extern` block uses type `i128`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:151:33
|
||||
--> $DIR/lint-ctypes-enum.rs:152:33
|
||||
|
|
||||
LL | fn result_nonzero_i128_e(x: Result<(), num::NonZero<i128>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -175,7 +175,7 @@ LL | fn result_nonzero_i128_e(x: Result<(), num::NonZero<i128>>);
|
|||
= note: 128-bit integers don't currently have a known stable ABI
|
||||
|
||||
error: `extern` block uses type `Result<(), TransparentUnion<NonZero<u8>>>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:156:38
|
||||
--> $DIR/lint-ctypes-enum.rs:157:38
|
||||
|
|
||||
LL | fn result_transparent_union_e(x: Result<(), TransparentUnion<num::NonZero<u8>>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -184,7 +184,7 @@ LL | fn result_transparent_union_e(x: Result<(), TransparentUnion<num::NonZe
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), Rust<NonZero<u8>>>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:158:30
|
||||
--> $DIR/lint-ctypes-enum.rs:159:30
|
||||
|
|
||||
LL | fn result_repr_rust_e(x: Result<(), Rust<num::NonZero<u8>>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -193,7 +193,7 @@ LL | fn result_repr_rust_e(x: Result<(), Rust<num::NonZero<u8>>>);
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<U, NonZero<u8>>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:162:51
|
||||
--> $DIR/lint-ctypes-enum.rs:163:51
|
||||
|
|
||||
LL | fn result_1zst_exhaustive_single_variant_e(x: Result<U, num::NonZero<u8>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -202,7 +202,7 @@ LL | fn result_1zst_exhaustive_single_variant_e(x: Result<U, num::NonZero<u8
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<B, NonZero<u8>>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:164:53
|
||||
--> $DIR/lint-ctypes-enum.rs:165:53
|
||||
|
|
||||
LL | fn result_1zst_exhaustive_multiple_variant_e(x: Result<B, num::NonZero<u8>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -211,7 +211,7 @@ LL | fn result_1zst_exhaustive_multiple_variant_e(x: Result<B, num::NonZero<
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<NonExhaustive, NonZero<u8>>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:166:51
|
||||
--> $DIR/lint-ctypes-enum.rs:167:51
|
||||
|
|
||||
LL | fn result_1zst_non_exhaustive_no_variant_e(x: Result<NonExhaustive, num::NonZero<u8>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -220,7 +220,7 @@ LL | fn result_1zst_non_exhaustive_no_variant_e(x: Result<NonExhaustive, num
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<Field, NonZero<u8>>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:169:49
|
||||
--> $DIR/lint-ctypes-enum.rs:170:49
|
||||
|
|
||||
LL | fn result_1zst_exhaustive_single_field_e(x: Result<Field, num::NonZero<u8>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
@ -229,7 +229,7 @@ LL | fn result_1zst_exhaustive_single_field_e(x: Result<Field, num::NonZero<
|
|||
= note: enum has no representation hint
|
||||
|
||||
error: `extern` block uses type `Result<(), Result<(), NonZero<u8>>>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes-enum.rs:171:30
|
||||
--> $DIR/lint-ctypes-enum.rs:172:30
|
||||
|
|
||||
LL | fn result_cascading_e(x: Result<(), Result<(), num::NonZero<u8>>>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
|
|
|
|||
Loading…
Reference in New Issue