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Rollup merge of #77122 - ecstatic-morse:const-fn-arithmetic, r=RalfJung,oli-obk 

Add `#![feature(const_fn_floating_point_arithmetic)]`

cc #76618

This is a template for splitting up `const_fn` into granular feature gates. I think this will make it easier, both for us and for users, to track stabilization of each individual feature. We don't *have* to do this, however. We could also keep stabilizing things out from under `const_fn`.

cc @rust-lang/wg-const-eval
r? @oli-obk
This commit is contained in:
Ralf Jung 2020-09-26 12:58:20 +02:00 committed by GitHub
parent ac8169dc10 659028f48b
commit 3b544e73ae
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
18 changed files with 159 additions and 84 deletions
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3
compiler/rustc_feature/src/active.rs
View File

@ -584,6 +584,9 @@ declare_features! (
/// Allows non trivial generic constants which have to be manually propageted upwards.
(active, const_evaluatable_checked, "1.48.0", Some(76560), None),
/// Allows basic arithmetic on floating point types in a `const fn`.
(active, const_fn_floating_point_arithmetic, "1.48.0", Some(57241), None),
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates
// -------------------------------------------------------------------------

24
compiler/rustc_mir/src/transform/check_consts/ops.rs
View File

@ -112,6 +112,30 @@ impl NonConstOp for Abort {
}
}
#[derive(Debug)]
pub struct FloatingPointOp;
impl NonConstOp for FloatingPointOp {
const STOPS_CONST_CHECKING: bool = true;
fn status_in_item(&self, ccx: &ConstCx<'_, '_>) -> Status {
if ccx.const_kind() == hir::ConstContext::ConstFn {
Status::Unstable(sym::const_fn_floating_point_arithmetic)
} else {
Status::Allowed
}
}
fn emit_error(&self, ccx: &ConstCx<'_, '_>, span: Span) {
feature_err(
&ccx.tcx.sess.parse_sess,
sym::const_fn_floating_point_arithmetic,
span,
&format!("floating point arithmetic is not allowed in {}s", ccx.const_kind()),
)
.emit();
}
}
#[derive(Debug)]
pub struct NonPrimitiveOp;
impl NonConstOp for NonPrimitiveOp {

31
compiler/rustc_mir/src/transform/check_consts/validation.rs
View File

@ -540,8 +540,12 @@ impl Visitor<'tcx> for Validator<'mir, 'tcx> {
Rvalue::UnaryOp(_, ref operand) => {
let ty = operand.ty(self.body, self.tcx);
if !(ty.is_integral() || ty.is_bool()) {
self.check_op(ops::NonPrimitiveOp)
if is_int_bool_or_char(ty) {
// Int, bool, and char operations are fine.
} else if ty.is_floating_point() {
self.check_op(ops::FloatingPointOp);
} else {
span_bug!(self.span, "non-primitive type in `Rvalue::UnaryOp`: {:?}", ty);
}
}
@ -550,7 +554,9 @@ impl Visitor<'tcx> for Validator<'mir, 'tcx> {
let lhs_ty = lhs.ty(self.body, self.tcx);
let rhs_ty = rhs.ty(self.body, self.tcx);
if let ty::RawPtr(_) | ty::FnPtr(..) = lhs_ty.kind() {
if is_int_bool_or_char(lhs_ty) && is_int_bool_or_char(rhs_ty) {
// Int, bool, and char operations are fine.
} else if lhs_ty.is_fn_ptr() || lhs_ty.is_unsafe_ptr() {
assert_eq!(lhs_ty, rhs_ty);
assert!(
op == BinOp::Eq
@ -563,12 +569,15 @@ impl Visitor<'tcx> for Validator<'mir, 'tcx> {
);
self.check_op(ops::RawPtrComparison);
}
if !(lhs_ty.is_integral() || lhs_ty.is_bool() || lhs_ty.is_char())
|| !(rhs_ty.is_integral() || rhs_ty.is_bool() || rhs_ty.is_char())
{
self.check_op(ops::NonPrimitiveOp)
} else if lhs_ty.is_floating_point() || rhs_ty.is_floating_point() {
self.check_op(ops::FloatingPointOp);
} else {
span_bug!(
self.span,
"non-primitive type in `Rvalue::BinaryOp`: {:?} ⚬ {:?}",
lhs_ty,
rhs_ty
);
}
}
}
@ -867,3 +876,7 @@ fn place_as_reborrow(
}
})
}
fn is_int_bool_or_char(ty: Ty<'_>) -> bool {
ty.is_bool() || ty.is_integral() || ty.is_char()
}

1
compiler/rustc_span/src/symbol.rs
View File

@ -352,6 +352,7 @@ symbols! {
const_evaluatable_checked,
const_extern_fn,
const_fn,
const_fn_floating_point_arithmetic,
const_fn_transmute,
const_fn_union,
const_generics,

1
library/core/src/lib.rs
View File

@ -82,6 +82,7 @@
#![feature(const_pin)]
#![feature(const_fn_union)]
#![feature(const_fn)]
#![cfg_attr(not(bootstrap), feature(const_fn_floating_point_arithmetic))]
#![feature(const_generics)]
#![feature(const_option)]
#![feature(const_precise_live_drops)]

1
library/std/src/lib.rs
View File

@ -236,6 +236,7 @@
#![feature(clamp)]
#![feature(concat_idents)]
#![feature(const_cstr_unchecked)]
#![cfg_attr(not(bootstrap), feature(const_fn_floating_point_arithmetic))]
#![feature(const_fn_transmute)]
#![feature(const_fn)]
#![feature(const_ip)]

2
src/test/ui/consts/const-extern-fn/const-extern-fn-min-const-fn.rs
View File

@ -4,7 +4,7 @@ const extern fn unsize(x: &[u8; 3]) -> &[u8] { x }
const unsafe extern "C" fn closure() -> fn() { || {} }
//~^ ERROR function pointers in const fn are unstable
const unsafe extern fn use_float() { 1.0 + 1.0; }
//~^ ERROR only int, `bool` and `char` operations are stable in const fn
//~^ ERROR floating point arithmetic
const extern "C" fn ptr_cast(val: *const u8) { val as usize; }
//~^ ERROR casting pointers to integers

6
src/test/ui/consts/const-extern-fn/const-extern-fn-min-const-fn.stderr
View File

@ -7,14 +7,14 @@ LL | const unsafe extern "C" fn closure() -> fn() { || {} }
= note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: only int, `bool` and `char` operations are stable in const fn
error[E0658]: floating point arithmetic is not allowed in constant functions
--> $DIR/const-extern-fn-min-const-fn.rs:6:38
|
LL | const unsafe extern fn use_float() { 1.0 + 1.0; }
| ^^^^^^^^^
|
= note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
= help: add `#![feature(const_fn)]` to the crate attributes to enable
= note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
= help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
error[E0658]: casting pointers to integers in constant functions is unstable
--> $DIR/const-extern-fn-min-const-fn.rs:8:48

8
src/test/ui/consts/const_fn_floating_point_arithmetic.gated.stderr Normal file
View File

@ -0,0 +1,8 @@
error: fatal error triggered by #[rustc_error]
--> $DIR/const_fn_floating_point_arithmetic.rs:20:1
|
LL | fn main() {}
| ^^^^^^^^^
error: aborting due to previous error

20
src/test/ui/consts/const_fn_floating_point_arithmetic.rs Normal file
View File

@ -0,0 +1,20 @@
// gate-test-const_fn_floating_point_arithmetic
// revisions: stock gated
#![feature(rustc_attrs)]
#![cfg_attr(gated, feature(const_fn_floating_point_arithmetic))]
const fn add(f: f32) -> f32 { f + 2.0 }
//[stock]~^ floating point arithmetic
const fn sub(f: f32) -> f32 { 2.0 - f }
//[stock]~^ floating point arithmetic
const fn mul(f: f32, g: f32) -> f32 { f * g }
//[stock]~^ floating point arithmetic
const fn div(f: f32, g: f32) -> f32 { f / g }
//[stock]~^ floating point arithmetic
const fn neg(f: f32) -> f32 { -f }
//[stock]~^ floating point arithmetic
#[rustc_error]
fn main() {} //[gated]~ fatal error triggered by #[rustc_error]

48
src/test/ui/consts/const_fn_floating_point_arithmetic.stock.stderr Normal file
View File

@ -0,0 +1,48 @@
error[E0658]: floating point arithmetic is not allowed in constant functions
--> $DIR/const_fn_floating_point_arithmetic.rs:8:31
|
LL | const fn add(f: f32) -> f32 { f + 2.0 }
| ^^^^^^^
|
= note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
= help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
error[E0658]: floating point arithmetic is not allowed in constant functions
--> $DIR/const_fn_floating_point_arithmetic.rs:10:31
|
LL | const fn sub(f: f32) -> f32 { 2.0 - f }
| ^^^^^^^
|
= note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
= help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
error[E0658]: floating point arithmetic is not allowed in constant functions
--> $DIR/const_fn_floating_point_arithmetic.rs:12:39
|
LL | const fn mul(f: f32, g: f32) -> f32 { f * g }
| ^^^^^
|
= note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
= help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
error[E0658]: floating point arithmetic is not allowed in constant functions
--> $DIR/const_fn_floating_point_arithmetic.rs:14:39
|
LL | const fn div(f: f32, g: f32) -> f32 { f / g }
| ^^^^^
|
= note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
= help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
error[E0658]: floating point arithmetic is not allowed in constant functions
--> $DIR/const_fn_floating_point_arithmetic.rs:16:31
|
LL | const fn neg(f: f32) -> f32 { -f }
| ^^
|
= note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
= help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
error: aborting due to 5 previous errors
For more information about this error, try `rustc --explain E0658`.

4
src/test/ui/consts/const_let_eq_float.rs
View File

@ -1,6 +1,6 @@
// build-pass (FIXME(62277): could be check-pass?)
// run-pass
#![feature(const_fn)]
#![feature(const_fn_floating_point_arithmetic)]
struct Foo<T>(T);
struct Bar<T> { x: T }

8
src/test/ui/consts/min_const_fn/min_const_fn.rs
View File

@ -77,14 +77,6 @@ const fn foo11<T: std::fmt::Display>(t: T) -> T { t }
//~^ ERROR trait bounds other than `Sized` on const fn parameters are unstable
const fn foo11_2<T: Send>(t: T) -> T { t }
//~^ ERROR trait bounds other than `Sized` on const fn parameters are unstable
const fn foo19(f: f32) -> f32 { f * 2.0 }
//~^ ERROR int, `bool` and `char` operations
const fn foo19_2(f: f32) -> f32 { 2.0 - f }
//~^ ERROR int, `bool` and `char` operations
const fn foo19_3(f: f32) -> f32 { -f }
//~^ ERROR int, `bool` and `char` operations
const fn foo19_4(f: f32, g: f32) -> f32 { f / g }
//~^ ERROR int, `bool` and `char` operations
static BAR: u32 = 42;
const fn foo25() -> u32 { BAR } //~ ERROR cannot refer to statics

72
src/test/ui/consts/min_const_fn/min_const_fn.stderr
View File

@ -76,44 +76,8 @@ LL | const fn foo11_2<T: Send>(t: T) -> T { t }
= note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: only int, `bool` and `char` operations are stable in const fn
--> $DIR/min_const_fn.rs:80:33
|
LL | const fn foo19(f: f32) -> f32 { f * 2.0 }
| ^^^^^^^
|
= note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: only int, `bool` and `char` operations are stable in const fn
--> $DIR/min_const_fn.rs:82:35
|
LL | const fn foo19_2(f: f32) -> f32 { 2.0 - f }
| ^^^^^^^
|
= note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: only int, `bool` and `char` operations are stable in const fn
--> $DIR/min_const_fn.rs:84:35
|
LL | const fn foo19_3(f: f32) -> f32 { -f }
| ^^
|
= note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: only int, `bool` and `char` operations are stable in const fn
--> $DIR/min_const_fn.rs:86:43
|
LL | const fn foo19_4(f: f32, g: f32) -> f32 { f / g }
| ^^^^^
|
= note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0013]: constant functions cannot refer to statics
--> $DIR/min_const_fn.rs:90:27
--> $DIR/min_const_fn.rs:82:27
|
LL | const fn foo25() -> u32 { BAR }
| ^^^
@ -121,7 +85,7 @@ LL | const fn foo25() -> u32 { BAR }
= help: consider extracting the value of the `static` to a `const`, and referring to that
error[E0013]: constant functions cannot refer to statics
--> $DIR/min_const_fn.rs:91:37
--> $DIR/min_const_fn.rs:83:37
|
LL | const fn foo26() -> &'static u32 { &BAR }
| ^^^
@ -129,7 +93,7 @@ LL | const fn foo26() -> &'static u32 { &BAR }
= help: consider extracting the value of the `static` to a `const`, and referring to that
error[E0658]: casting pointers to integers in constant functions is unstable
--> $DIR/min_const_fn.rs:92:42
--> $DIR/min_const_fn.rs:84:42
|
LL | const fn foo30(x: *const u32) -> usize { x as usize }
| ^^^^^^^^^^
@ -138,7 +102,7 @@ LL | const fn foo30(x: *const u32) -> usize { x as usize }
= help: add `#![feature(const_raw_ptr_to_usize_cast)]` to the crate attributes to enable
error[E0658]: casting pointers to integers in constant functions is unstable
--> $DIR/min_const_fn.rs:94:63
--> $DIR/min_const_fn.rs:86:63
|
LL | const fn foo30_with_unsafe(x: *const u32) -> usize { unsafe { x as usize } }
| ^^^^^^^^^^
@ -147,7 +111,7 @@ LL | const fn foo30_with_unsafe(x: *const u32) -> usize { unsafe { x as usize }
= help: add `#![feature(const_raw_ptr_to_usize_cast)]` to the crate attributes to enable
error[E0658]: casting pointers to integers in constant functions is unstable
--> $DIR/min_const_fn.rs:96:42
--> $DIR/min_const_fn.rs:88:42
|
LL | const fn foo30_2(x: *mut u32) -> usize { x as usize }
| ^^^^^^^^^^
@ -156,7 +120,7 @@ LL | const fn foo30_2(x: *mut u32) -> usize { x as usize }
= help: add `#![feature(const_raw_ptr_to_usize_cast)]` to the crate attributes to enable
error[E0658]: casting pointers to integers in constant functions is unstable
--> $DIR/min_const_fn.rs:98:63
--> $DIR/min_const_fn.rs:90:63
|
LL | const fn foo30_2_with_unsafe(x: *mut u32) -> usize { unsafe { x as usize } }
| ^^^^^^^^^^
@ -165,7 +129,7 @@ LL | const fn foo30_2_with_unsafe(x: *mut u32) -> usize { unsafe { x as usize }
= help: add `#![feature(const_raw_ptr_to_usize_cast)]` to the crate attributes to enable
error[E0658]: mutable references are not allowed in constant functions
--> $DIR/min_const_fn.rs:101:14
--> $DIR/min_const_fn.rs:93:14
|
LL | const fn inc(x: &mut i32) { *x += 1 }
| ^
@ -174,7 +138,7 @@ LL | const fn inc(x: &mut i32) { *x += 1 }
= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
error[E0723]: trait bounds other than `Sized` on const fn parameters are unstable
--> $DIR/min_const_fn.rs:110:6
--> $DIR/min_const_fn.rs:102:6
|
LL | impl<T: std::fmt::Debug> Foo<T> {
| ^
@ -183,7 +147,7 @@ LL | impl<T: std::fmt::Debug> Foo<T> {
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: trait bounds other than `Sized` on const fn parameters are unstable
--> $DIR/min_const_fn.rs:115:6
--> $DIR/min_const_fn.rs:107:6
|
LL | impl<T: std::fmt::Debug + Sized> Foo<T> {
| ^
@ -192,7 +156,7 @@ LL | impl<T: std::fmt::Debug + Sized> Foo<T> {
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: trait bounds other than `Sized` on const fn parameters are unstable
--> $DIR/min_const_fn.rs:120:6
--> $DIR/min_const_fn.rs:112:6
|
LL | impl<T: Sync + Sized> Foo<T> {
| ^
@ -201,7 +165,7 @@ LL | impl<T: Sync + Sized> Foo<T> {
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: trait bounds other than `Sized` on const fn parameters are unstable
--> $DIR/min_const_fn.rs:126:34
--> $DIR/min_const_fn.rs:118:34
|
LL | const fn no_apit2(_x: AlanTuring<impl std::fmt::Debug>) {}
| ^^^^^^^^^^^^^^^^^^^^
@ -210,7 +174,7 @@ LL | const fn no_apit2(_x: AlanTuring<impl std::fmt::Debug>) {}
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: trait bounds other than `Sized` on const fn parameters are unstable
--> $DIR/min_const_fn.rs:128:22
--> $DIR/min_const_fn.rs:120:22
|
LL | const fn no_apit(_x: impl std::fmt::Debug) {}
| ^^^^^^^^^^^^^^^^^^^^
@ -219,7 +183,7 @@ LL | const fn no_apit(_x: impl std::fmt::Debug) {}
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: trait bounds other than `Sized` on const fn parameters are unstable
--> $DIR/min_const_fn.rs:129:23
--> $DIR/min_const_fn.rs:121:23
|
LL | const fn no_dyn_trait(_x: &dyn std::fmt::Debug) {}
| ^^
@ -228,7 +192,7 @@ LL | const fn no_dyn_trait(_x: &dyn std::fmt::Debug) {}
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: trait bounds other than `Sized` on const fn parameters are unstable
--> $DIR/min_const_fn.rs:130:32
--> $DIR/min_const_fn.rs:122:32
|
LL | const fn no_dyn_trait_ret() -> &'static dyn std::fmt::Debug { &() }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -237,7 +201,7 @@ LL | const fn no_dyn_trait_ret() -> &'static dyn std::fmt::Debug { &() }
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: trait bounds other than `Sized` on const fn parameters are unstable
--> $DIR/min_const_fn.rs:135:41
--> $DIR/min_const_fn.rs:127:41
|
LL | const fn really_no_traits_i_mean_it() { (&() as &dyn std::fmt::Debug, ()).1 }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -246,7 +210,7 @@ LL | const fn really_no_traits_i_mean_it() { (&() as &dyn std::fmt::Debug, ()).1
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: function pointers in const fn are unstable
--> $DIR/min_const_fn.rs:138:21
--> $DIR/min_const_fn.rs:130:21
|
LL | const fn no_fn_ptrs(_x: fn()) {}
| ^^
@ -255,7 +219,7 @@ LL | const fn no_fn_ptrs(_x: fn()) {}
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error[E0723]: function pointers in const fn are unstable
--> $DIR/min_const_fn.rs:140:27
--> $DIR/min_const_fn.rs:132:27
|
LL | const fn no_fn_ptrs2() -> fn() { fn foo() {} foo }
| ^^^^
@ -263,7 +227,7 @@ LL | const fn no_fn_ptrs2() -> fn() { fn foo() {} foo }
= note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
= help: add `#![feature(const_fn)]` to the crate attributes to enable
error: aborting due to 30 previous errors
error: aborting due to 26 previous errors
Some errors have detailed explanations: E0013, E0493, E0658, E0723.
For more information about an error, try `rustc --explain E0013`.

6
src/test/ui/consts/min_const_fn/min_const_fn_libstd_stability.rs
View File

@ -3,7 +3,7 @@
we're apparently really bad at it",
issue = "none")]
#![feature(const_fn, foo, foo2)]
#![feature(const_fn, const_fn_floating_point_arithmetic, foo, foo2)]
#![feature(staged_api)]
#[stable(feature = "rust1", since = "1.0.0")]
@ -25,9 +25,9 @@ const fn bar2() -> u32 { foo2() } //~ ERROR not yet stable as a const fn
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "rust1", since = "1.0.0")]
// conformity is required, even with `const_fn` feature gate
// Const-stable functions cannot rely on unstable const-eval features.
const fn bar3() -> u32 { (5f32 + 6f32) as u32 }
//~^ ERROR const-stable function cannot use `#[feature(const_fn)]`
//~^ ERROR const-stable function cannot use `#[feature(const_fn_floating_point_arithmetic)]`
// check whether this function cannot be called even with the feature gate active
#[unstable(feature = "foo2", issue = "none")]

2
src/test/ui/consts/min_const_fn/min_const_fn_libstd_stability.stderr
View File

@ -14,7 +14,7 @@ LL | const fn bar2() -> u32 { foo2() }
|
= help: Const-stable functions can only call other const-stable functions
error: const-stable function cannot use `#[feature(const_fn)]`
error: const-stable function cannot use `#[feature(const_fn_floating_point_arithmetic)]`
--> $DIR/min_const_fn_libstd_stability.rs:29:26
|
LL | const fn bar3() -> u32 { (5f32 + 6f32) as u32 }

4
src/test/ui/consts/min_const_fn/min_const_unsafe_fn_libstd_stability.rs
View File

@ -3,7 +3,7 @@
we're apparently really bad at it",
issue = "none")]
#![feature(const_fn, foo, foo2)]
#![feature(const_fn, const_fn_floating_point_arithmetic, foo, foo2)]
#![feature(staged_api)]
#[stable(feature = "rust1", since = "1.0.0")]
@ -27,7 +27,7 @@ const unsafe fn bar2() -> u32 { unsafe { foo2() } } //~ ERROR not yet stable as
#[rustc_const_stable(feature = "rust1", since = "1.0.0")]
// conformity is required, even with `const_fn` feature gate
const unsafe fn bar3() -> u32 { (5f32 + 6f32) as u32 }
//~^ ERROR const-stable function cannot use `#[feature(const_fn)]`
//~^ ERROR const-stable function cannot use `#[feature(const_fn_floating_point_arithmetic)]`
// check whether this function cannot be called even with the feature gate active
#[unstable(feature = "foo2", issue = "none")]

2
src/test/ui/consts/min_const_fn/min_const_unsafe_fn_libstd_stability.stderr
View File

@ -14,7 +14,7 @@ LL | const unsafe fn bar2() -> u32 { unsafe { foo2() } }
|
= help: Const-stable functions can only call other const-stable functions
error: const-stable function cannot use `#[feature(const_fn)]`
error: const-stable function cannot use `#[feature(const_fn_floating_point_arithmetic)]`
--> $DIR/min_const_unsafe_fn_libstd_stability.rs:29:33
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LL | const unsafe fn bar3() -> u32 { (5f32 + 6f32) as u32 }