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Stabilize const_panic
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jhpratt committed Oct 4, 2021
1 parent e737694 commit bce8621
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Showing 51 changed files with 100 additions and 229 deletions.
2 changes: 1 addition & 1 deletion compiler/rustc_borrowck/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@

#![feature(bool_to_option)]
#![feature(box_patterns)]
#![feature(const_panic)]
#![cfg_attr(bootstrap, feature(const_panic))]
#![feature(crate_visibility_modifier)]
#![feature(format_args_capture)]
#![feature(in_band_lifetimes)]
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2 changes: 0 additions & 2 deletions compiler/rustc_const_eval/src/transform/check_consts/check.rs
Original file line number Diff line number Diff line change
Expand Up @@ -887,8 +887,6 @@ impl Visitor<'tcx> for Checker<'mir, 'tcx> {

// At this point, we are calling a function, `callee`, whose `DefId` is known...
if is_lang_panic_fn(tcx, callee) {
self.check_op(ops::Panic);

// `begin_panic` and `panic_display` are generic functions that accept
// types other than str. Check to enforce that only str can be used in
// const-eval.
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17 changes: 0 additions & 17 deletions compiler/rustc_const_eval/src/transform/check_consts/ops.rs
Original file line number Diff line number Diff line change
Expand Up @@ -368,23 +368,6 @@ impl NonConstOp for MutDeref {
}
}

#[derive(Debug)]
pub struct Panic;
impl NonConstOp for Panic {
fn status_in_item(&self, _: &ConstCx<'_, '_>) -> Status {
Status::Unstable(sym::const_panic)
}

fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> DiagnosticBuilder<'tcx> {
feature_err(
&ccx.tcx.sess.parse_sess,
sym::const_panic,
span,
&format!("panicking in {}s is unstable", ccx.const_kind()),
)
}
}

/// A call to a `panic()` lang item where the first argument is _not_ a `&str`.
#[derive(Debug)]
pub struct PanicNonStr;
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2 changes: 1 addition & 1 deletion compiler/rustc_data_structures/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@
#![feature(associated_type_bounds)]
#![feature(auto_traits)]
#![feature(bool_to_option)]
#![feature(const_panic)]
#![cfg_attr(bootstrap, feature(const_panic))]
#![feature(control_flow_enum)]
#![feature(core_intrinsics)]
#![feature(extend_one)]
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2 changes: 2 additions & 0 deletions compiler/rustc_feature/src/accepted.rs
Original file line number Diff line number Diff line change
Expand Up @@ -297,6 +297,8 @@ declare_features! (
(accepted, arbitrary_enum_discriminant, "1.56.0", Some(60553), None),
/// Allows macro attributes to observe output of `#[derive]`.
(accepted, macro_attributes_in_derive_output, "1.57.0", Some(81119), None),
/// Allows panicking during const eval (producing compile-time errors).
(accepted, const_panic, "1.57.0", Some(51999), None),

// -------------------------------------------------------------------------
// feature-group-end: accepted features
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3 changes: 0 additions & 3 deletions compiler/rustc_feature/src/active.rs
Original file line number Diff line number Diff line change
Expand Up @@ -425,9 +425,6 @@ declare_features! (
/// Allows using the `amdgpu-kernel` ABI.
(active, abi_amdgpu_kernel, "1.29.0", Some(51575), None),

/// Allows panicking during const eval (producing compile-time errors).
(active, const_panic, "1.30.0", Some(51999), None),

/// Allows `#[marker]` on certain traits allowing overlapping implementations.
(active, marker_trait_attr, "1.30.0", Some(29864), None),

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8 changes: 6 additions & 2 deletions compiler/rustc_index/src/vec.rs
Original file line number Diff line number Diff line change
Expand Up @@ -124,7 +124,9 @@ macro_rules! newtype_index {

#[inline]
$v const fn from_usize(value: usize) -> Self {
// FIXME: replace with `assert!(value <= ($max as usize));` once `const_panic` is stable
#[cfg(not(bootstrap))]
assert!(value <= ($max as usize));
#[cfg(bootstrap)]
[()][(value > ($max as usize)) as usize];
unsafe {
Self::from_u32_unchecked(value as u32)
Expand All @@ -133,7 +135,9 @@ macro_rules! newtype_index {

#[inline]
$v const fn from_u32(value: u32) -> Self {
// FIXME: replace with `assert!(value <= $max);` once `const_panic` is stable
#[cfg(not(bootstrap))]
assert!(value <= $max);
#[cfg(bootstrap)]
[()][(value > $max) as usize];
unsafe {
Self::from_u32_unchecked(value)
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2 changes: 1 addition & 1 deletion compiler/rustc_mir_dataflow/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
#![feature(bool_to_option)]
#![feature(box_patterns)]
#![feature(box_syntax)]
#![feature(const_panic)]
#![cfg_attr(bootstrap, feature(const_panic))]
#![feature(exact_size_is_empty)]
#![feature(in_band_lifetimes)]
#![feature(iter_zip)]
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2 changes: 1 addition & 1 deletion compiler/rustc_mir_transform/src/lib.rs
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
#![feature(box_patterns)]
#![feature(box_syntax)]
#![feature(crate_visibility_modifier)]
#![feature(const_panic)]
#![cfg_attr(bootstrap, feature(const_panic))]
#![feature(in_band_lifetimes)]
#![feature(iter_zip)]
#![feature(map_try_insert)]
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2 changes: 1 addition & 1 deletion library/core/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -123,7 +123,7 @@
#![feature(const_fn_trait_bound)]
#![feature(const_impl_trait)]
#![feature(const_mut_refs)]
#![feature(const_panic)]
#![cfg_attr(bootstrap, feature(const_panic))]
#![feature(const_precise_live_drops)]
#![feature(const_raw_ptr_deref)]
#![feature(const_refs_to_cell)]
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1 change: 0 additions & 1 deletion src/test/mir-opt/remove-never-const.rs
Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,6 @@
// Force generation of optimized mir for functions that do not reach codegen.
// compile-flags: --emit mir,link

#![feature(const_panic)]
#![feature(never_type)]
#![warn(const_err)]

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Original file line number Diff line number Diff line change
@@ -1,11 +1,11 @@
// MIR for `no_codegen` after PreCodegen

fn no_codegen() -> () {
let mut _0: (); // return place in scope 0 at $DIR/remove-never-const.rs:19:20: 19:20
let mut _0: (); // return place in scope 0 at $DIR/remove-never-const.rs:18:20: 18:20
scope 1 {
}

bb0: {
unreachable; // scope 0 at $DIR/remove-never-const.rs:20:13: 20:33
unreachable; // scope 0 at $DIR/remove-never-const.rs:19:13: 19:33
}
}
1 change: 0 additions & 1 deletion src/test/ui/consts/const-eval/const_panic.rs
Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
#![feature(const_panic)]
#![allow(non_fmt_panics)]
#![crate_type = "lib"]

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48 changes: 24 additions & 24 deletions src/test/ui/consts/const-eval/const_panic.stderr
Original file line number Diff line number Diff line change
@@ -1,96 +1,96 @@
error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:7:15
--> $DIR/const_panic.rs:6:15
|
LL | const Z: () = std::panic!("cheese");
| ^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'cheese', $DIR/const_panic.rs:7:15
| ^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'cheese', $DIR/const_panic.rs:6:15
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:10:16
--> $DIR/const_panic.rs:9:16
|
LL | const Z2: () = std::panic!();
| ^^^^^^^^^^^^^ the evaluated program panicked at 'explicit panic', $DIR/const_panic.rs:10:16
| ^^^^^^^^^^^^^ the evaluated program panicked at 'explicit panic', $DIR/const_panic.rs:9:16
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:13:15
--> $DIR/const_panic.rs:12:15
|
LL | const Y: () = std::unreachable!();
| ^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'internal error: entered unreachable code', $DIR/const_panic.rs:13:15
| ^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'internal error: entered unreachable code', $DIR/const_panic.rs:12:15
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:16:15
--> $DIR/const_panic.rs:15:15
|
LL | const X: () = std::unimplemented!();
| ^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'not implemented', $DIR/const_panic.rs:16:15
| ^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'not implemented', $DIR/const_panic.rs:15:15
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:19:15
--> $DIR/const_panic.rs:18:15
|
LL | const W: () = std::panic!(MSG);
| ^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic.rs:19:15
| ^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic.rs:18:15
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:22:16
--> $DIR/const_panic.rs:21:16
|
LL | const W2: () = std::panic!("{}", MSG);
| ^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic.rs:22:16
| ^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic.rs:21:16
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:25:20
--> $DIR/const_panic.rs:24:20
|
LL | const Z_CORE: () = core::panic!("cheese");
| ^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'cheese', $DIR/const_panic.rs:25:20
| ^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'cheese', $DIR/const_panic.rs:24:20
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:28:21
--> $DIR/const_panic.rs:27:21
|
LL | const Z2_CORE: () = core::panic!();
| ^^^^^^^^^^^^^^ the evaluated program panicked at 'explicit panic', $DIR/const_panic.rs:28:21
| ^^^^^^^^^^^^^^ the evaluated program panicked at 'explicit panic', $DIR/const_panic.rs:27:21
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:31:20
--> $DIR/const_panic.rs:30:20
|
LL | const Y_CORE: () = core::unreachable!();
| ^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'internal error: entered unreachable code', $DIR/const_panic.rs:31:20
| ^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'internal error: entered unreachable code', $DIR/const_panic.rs:30:20
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:34:20
--> $DIR/const_panic.rs:33:20
|
LL | const X_CORE: () = core::unimplemented!();
| ^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'not implemented', $DIR/const_panic.rs:34:20
| ^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'not implemented', $DIR/const_panic.rs:33:20
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:37:20
--> $DIR/const_panic.rs:36:20
|
LL | const W_CORE: () = core::panic!(MSG);
| ^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic.rs:37:20
| ^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic.rs:36:20
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic.rs:40:21
--> $DIR/const_panic.rs:39:21
|
LL | const W2_CORE: () = core::panic!("{}", MSG);
| ^^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic.rs:40:21
| ^^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic.rs:39:21
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

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1 change: 0 additions & 1 deletion src/test/ui/consts/const-eval/const_panic_2021.rs
Original file line number Diff line number Diff line change
@@ -1,5 +1,4 @@
// edition:2021
#![feature(const_panic)]
#![crate_type = "lib"]

const MSG: &str = "hello";
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40 changes: 20 additions & 20 deletions src/test/ui/consts/const-eval/const_panic_2021.stderr
Original file line number Diff line number Diff line change
@@ -1,80 +1,80 @@
error[E0080]: evaluation of constant value failed
--> $DIR/const_panic_2021.rs:7:15
--> $DIR/const_panic_2021.rs:6:15
|
LL | const A: () = std::panic!("blåhaj");
| ^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'blåhaj', $DIR/const_panic_2021.rs:7:15
| ^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'blåhaj', $DIR/const_panic_2021.rs:6:15
|
= note: this error originates in the macro `$crate::panic::panic_2021` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic_2021.rs:10:15
--> $DIR/const_panic_2021.rs:9:15
|
LL | const B: () = std::panic!();
| ^^^^^^^^^^^^^ the evaluated program panicked at 'explicit panic', $DIR/const_panic_2021.rs:10:15
| ^^^^^^^^^^^^^ the evaluated program panicked at 'explicit panic', $DIR/const_panic_2021.rs:9:15
|
= note: this error originates in the macro `$crate::panic::panic_2021` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic_2021.rs:13:15
--> $DIR/const_panic_2021.rs:12:15
|
LL | const C: () = std::unreachable!();
| ^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'internal error: entered unreachable code', $DIR/const_panic_2021.rs:13:15
| ^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'internal error: entered unreachable code', $DIR/const_panic_2021.rs:12:15
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic_2021.rs:16:15
--> $DIR/const_panic_2021.rs:15:15
|
LL | const D: () = std::unimplemented!();
| ^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'not implemented', $DIR/const_panic_2021.rs:16:15
| ^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'not implemented', $DIR/const_panic_2021.rs:15:15
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic_2021.rs:19:15
--> $DIR/const_panic_2021.rs:18:15
|
LL | const E: () = std::panic!("{}", MSG);
| ^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic_2021.rs:19:15
| ^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic_2021.rs:18:15
|
= note: this error originates in the macro `$crate::panic::panic_2021` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic_2021.rs:22:20
--> $DIR/const_panic_2021.rs:21:20
|
LL | const A_CORE: () = core::panic!("shark");
| ^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'shark', $DIR/const_panic_2021.rs:22:20
| ^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'shark', $DIR/const_panic_2021.rs:21:20
|
= note: this error originates in the macro `$crate::panic::panic_2021` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic_2021.rs:25:20
--> $DIR/const_panic_2021.rs:24:20
|
LL | const B_CORE: () = core::panic!();
| ^^^^^^^^^^^^^^ the evaluated program panicked at 'explicit panic', $DIR/const_panic_2021.rs:25:20
| ^^^^^^^^^^^^^^ the evaluated program panicked at 'explicit panic', $DIR/const_panic_2021.rs:24:20
|
= note: this error originates in the macro `$crate::panic::panic_2021` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic_2021.rs:28:20
--> $DIR/const_panic_2021.rs:27:20
|
LL | const C_CORE: () = core::unreachable!();
| ^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'internal error: entered unreachable code', $DIR/const_panic_2021.rs:28:20
| ^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'internal error: entered unreachable code', $DIR/const_panic_2021.rs:27:20
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic_2021.rs:31:20
--> $DIR/const_panic_2021.rs:30:20
|
LL | const D_CORE: () = core::unimplemented!();
| ^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'not implemented', $DIR/const_panic_2021.rs:31:20
| ^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'not implemented', $DIR/const_panic_2021.rs:30:20
|
= note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0080]: evaluation of constant value failed
--> $DIR/const_panic_2021.rs:34:20
--> $DIR/const_panic_2021.rs:33:20
|
LL | const E_CORE: () = core::panic!("{}", MSG);
| ^^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic_2021.rs:34:20
| ^^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'hello', $DIR/const_panic_2021.rs:33:20
|
= note: this error originates in the macro `$crate::panic::panic_2021` (in Nightly builds, run with -Z macro-backtrace for more info)

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1 change: 0 additions & 1 deletion src/test/ui/consts/const-eval/const_panic_libcore_bin.rs
Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
#![crate_type = "bin"]
#![feature(lang_items)]
#![feature(const_panic)]
#![no_main]
#![no_std]

Expand Down
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