rust/tests/ui/intrinsics/reify-intrinsic.stderr

error[E0308]: cannot coerce intrinsics to function pointers
  --> $DIR/reify-intrinsic.rs:6:64
   |
LL |     let _: unsafe extern "rust-intrinsic" fn(isize) -> usize = std::mem::transmute;
   |            -------------------------------------------------   ^^^^^^^^^^^^^^^^^^^ cannot coerce intrinsics to function pointers
   |            |
   |            expected due to this
   |
   = note: expected fn pointer `unsafe extern "rust-intrinsic" fn(isize) -> usize`
                 found fn item `unsafe extern "rust-intrinsic" fn(_) -> _ {std::intrinsics::transmute::<_, _>}`

error[E0606]: casting `unsafe extern "rust-intrinsic" fn(_) -> _ {std::intrinsics::transmute::<_, _>}` as `unsafe extern "rust-intrinsic" fn(isize) -> usize` is invalid
  --> $DIR/reify-intrinsic.rs:11:13
   |
LL |     let _ = std::mem::transmute as unsafe extern "rust-intrinsic" fn(isize) -> usize;
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0308]: cannot coerce intrinsics to function pointers
  --> $DIR/reify-intrinsic.rs:17:9
   |
LL |         std::intrinsics::likely,
   |         ^^^^^^^^^^^^^^^^^^^^^^^ cannot coerce intrinsics to function pointers
   |
   = note: expected fn pointer `unsafe extern "rust-intrinsic" fn(_) -> _`
                 found fn item `fn(_) -> _ {likely}`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0308, E0606.
For more information about an error, try `rustc --explain E0308`.
Emit error on intrinsic to fn ptr casts 2019-09-02 21:28:37 +00:00			`error[E0308]: cannot coerce intrinsics to function pointers`
			`--> $DIR/reify-intrinsic.rs:6:64`
			`\|`
			`LL \| let _: unsafe extern "rust-intrinsic" fn(isize) -> usize = std::mem::transmute;`
Increase verbosity when suggesting subtle code changes 2020-03-12 03:38:21 +00:00			`\| ------------------------------------------------- ^^^^^^^^^^^^^^^^^^^ cannot coerce intrinsics to function pointers`
			`\| \|`
Point at type in `let` assignment on type errors 2019-11-19 05:00:24 +00:00			`\| expected due to this`
Emit error on intrinsic to fn ptr casts 2019-09-02 21:28:37 +00:00			`\|`
Specific labels when referring to "expected" and "found" types 2019-11-13 22:16:56 +00:00			= note: expected fn pointer `unsafe extern "rust-intrinsic" fn(isize) -> usize`
document & impl the transmutation modeled by `BikeshedIntrinsicFrom` Documents that `BikeshedIntrinsicFrom` models transmute-via-union, which is slightly more expressive than the transmute-via-cast implemented by `transmute_copy`. Additionally, we provide an implementation of transmute-via-union as a method on the `BikeshedIntrinsicFrom` trait with additional documentation on the boundary between trait invariants and caller obligations. Whether or not transmute-via-union is the right kind of transmute to model remains up for discussion [1]. Regardless, it seems wise to document the present behavior. [1] https://rust-lang.zulipchat.com/#narrow/stream/216762-project-safe-transmute/topic/What.20'kind'.20of.20transmute.20to.20model.3F/near/426331967 2024-08-12 22:52:59 +00:00			found fn item `unsafe extern "rust-intrinsic" fn(_) -> _ {std::intrinsics::transmute::<_, _>}`
Emit error on intrinsic to fn ptr casts 2019-09-02 21:28:37 +00:00
document & impl the transmutation modeled by `BikeshedIntrinsicFrom` Documents that `BikeshedIntrinsicFrom` models transmute-via-union, which is slightly more expressive than the transmute-via-cast implemented by `transmute_copy`. Additionally, we provide an implementation of transmute-via-union as a method on the `BikeshedIntrinsicFrom` trait with additional documentation on the boundary between trait invariants and caller obligations. Whether or not transmute-via-union is the right kind of transmute to model remains up for discussion [1]. Regardless, it seems wise to document the present behavior. [1] https://rust-lang.zulipchat.com/#narrow/stream/216762-project-safe-transmute/topic/What.20'kind'.20of.20transmute.20to.20model.3F/near/426331967 2024-08-12 22:52:59 +00:00			error[E0606]: casting `unsafe extern "rust-intrinsic" fn(_) -> _ {std::intrinsics::transmute::<_, _>}` as `unsafe extern "rust-intrinsic" fn(isize) -> usize` is invalid
Emit error on intrinsic to fn ptr casts 2019-09-02 21:28:37 +00:00			`--> $DIR/reify-intrinsic.rs:11:13`
			`\|`
			`LL \| let _ = std::mem::transmute as unsafe extern "rust-intrinsic" fn(isize) -> usize;`
			`\| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^`

Check for intrinsics before coercing to a function pointer Return an error if coercing function items / non-capturing closures to a common function pointer type would require reifying an intrinsic. 2021-04-21 00:00:00 +00:00			`error[E0308]: cannot coerce intrinsics to function pointers`
Give the (`un`)`likely` intrinsics fallback bodies 2024-02-16 17:45:46 +00:00			`--> $DIR/reify-intrinsic.rs:17:9`
Check for intrinsics before coercing to a function pointer Return an error if coercing function items / non-capturing closures to a common function pointer type would require reifying an intrinsic. 2021-04-21 00:00:00 +00:00			`\|`
Give the (`un`)`likely` intrinsics fallback bodies 2024-02-16 17:45:46 +00:00			`LL \| std::intrinsics::likely,`
			`\| ^^^^^^^^^^^^^^^^^^^^^^^ cannot coerce intrinsics to function pointers`
Check for intrinsics before coercing to a function pointer Return an error if coercing function items / non-capturing closures to a common function pointer type would require reifying an intrinsic. 2021-04-21 00:00:00 +00:00			`\|`
Give the (`un`)`likely` intrinsics fallback bodies 2024-02-16 17:45:46 +00:00			= note: expected fn pointer `unsafe extern "rust-intrinsic" fn(_) -> _`
			found fn item `fn(_) -> _ {likely}`
Check for intrinsics before coercing to a function pointer Return an error if coercing function items / non-capturing closures to a common function pointer type would require reifying an intrinsic. 2021-04-21 00:00:00 +00:00
			`error: aborting due to 3 previous errors`
Emit error on intrinsic to fn ptr casts 2019-09-02 21:28:37 +00:00
			`Some errors have detailed explanations: E0308, E0606.`
			For more information about an error, try `rustc --explain E0308`.