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Auto merge of #118379 - compiler-errors:const-params-for-partialeq, r=fee1-dead

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Fix `PartialEq` args when `#[const_trait]` is enabled

This is based off of your PR that enforces effects on all methods, so just see the last commits.

r? fee1-dead
This commit is contained in:
bors 2023-11-30 05:24:53 +00:00
commit e55544c804
8 changed files with 85 additions and 91 deletions
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39
compiler/rustc_hir_typeck/src/callee.rs
View File

@ -6,9 +6,8 @@ use crate::errors;
use rustc_ast::util::parser::PREC_POSTFIX;
use rustc_errors::{Applicability, Diagnostic, ErrorGuaranteed, StashKey};
use rustc_hir as hir;
use rustc_hir::def::{self, CtorKind, DefKind, Namespace, Res};
use rustc_hir::def::{self, CtorKind, Namespace, Res};
use rustc_hir::def_id::DefId;
use rustc_hir::HirId;
use rustc_hir_analysis::autoderef::Autoderef;
use rustc_infer::{
infer,
@ -373,7 +372,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
) -> Ty<'tcx> {
let (fn_sig, def_id) = match *callee_ty.kind() {
ty::FnDef(def_id, args) => {
self.enforce_context_effects(call_expr.hir_id, call_expr.span, def_id, args);
self.enforce_context_effects(call_expr.span, def_id, args);
let fn_sig = self.tcx.fn_sig(def_id).instantiate(self.tcx, args);
// Unit testing: function items annotated with
@ -770,7 +769,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
#[tracing::instrument(level = "debug", skip(self, span))]
pub(super) fn enforce_context_effects(
&self,
call_expr_hir: HirId,
span: Span,
callee_did: DefId,
callee_args: GenericArgsRef<'tcx>,
@ -781,38 +779,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
let generics = tcx.generics_of(callee_did);
let Some(host_effect_index) = generics.host_effect_index else { return };
// if the callee does have the param, we need to equate the param to some const
// value no matter whether the effects feature is enabled in the local crate,
// because inference will fail if we don't.
let mut host_always_on =
!tcx.features().effects || tcx.sess.opts.unstable_opts.unleash_the_miri_inside_of_you;
// Compute the constness required by the context.
let context = tcx.hir().enclosing_body_owner(call_expr_hir);
let const_context = tcx.hir().body_const_context(context);
let kind = tcx.def_kind(context.to_def_id());
debug_assert_ne!(kind, DefKind::ConstParam);
if tcx.has_attr(context.to_def_id(), sym::rustc_do_not_const_check) {
trace!("do not const check this context");
host_always_on = true;
}
let effect = match const_context {
_ if host_always_on => tcx.consts.true_,
Some(hir::ConstContext::Static(_) | hir::ConstContext::Const { .. }) => {
tcx.consts.false_
}
Some(hir::ConstContext::ConstFn) => {
let host_idx = tcx
.generics_of(context)
.host_effect_index
.expect("ConstContext::Maybe must have host effect param");
ty::GenericArgs::identity_for_item(tcx, context).const_at(host_idx)
}
None => tcx.consts.true_,
};
let effect = tcx.expected_const_effect_param_for_body(self.body_id);
trace!(?effect, ?generics, ?callee_args);

2
compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
View File

@ -165,7 +165,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
span: Span,
method: MethodCallee<'tcx>,
) {
self.enforce_context_effects(hir_id, span, method.def_id, method.args);
self.enforce_context_effects(span, method.def_id, method.args);
self.write_resolution(hir_id, Ok((DefKind::AssocFn, method.def_id)));
self.write_args(hir_id, method.args);
}

7
compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
View File

@ -282,12 +282,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
span: provided_arg.span,
});
} else {
self.enforce_context_effects(
provided_arg.hir_id,
provided_arg.span,
def_id,
args,
)
self.enforce_context_effects(provided_arg.span, def_id, args)
}
}
} else {

51
compiler/rustc_middle/src/ty/util.rs
View File

@ -779,6 +779,57 @@ impl<'tcx> TyCtxt<'tcx> {
// the language.
|| self.extern_crate(key.as_def_id()).is_some_and(|e| e.is_direct())
}
pub fn expected_const_effect_param_for_body(self, def_id: LocalDefId) -> ty::Const<'tcx> {
// if the callee does have the param, we need to equate the param to some const
// value no matter whether the effects feature is enabled in the local crate,
// because inference will fail if we don't.
let mut host_always_on =
!self.features().effects || self.sess.opts.unstable_opts.unleash_the_miri_inside_of_you;
// Compute the constness required by the context.
let const_context = self.hir().body_const_context(def_id);
let kind = self.def_kind(def_id);
debug_assert_ne!(kind, DefKind::ConstParam);
if self.has_attr(def_id, sym::rustc_do_not_const_check) {
trace!("do not const check this context");
host_always_on = true;
}
match const_context {
_ if host_always_on => self.consts.true_,
Some(hir::ConstContext::Static(_) | hir::ConstContext::Const { .. }) => {
self.consts.false_
}
Some(hir::ConstContext::ConstFn) => {
let host_idx = self
.generics_of(def_id)
.host_effect_index
.expect("ConstContext::Maybe must have host effect param");
ty::GenericArgs::identity_for_item(self, def_id).const_at(host_idx)
}
None => self.consts.true_,
}
}
/// Constructs generic args for an item, optionally appending a const effect param type
pub fn with_opt_const_effect_param(
self,
caller_def_id: LocalDefId,
callee_def_id: DefId,
args: impl IntoIterator<Item: Into<ty::GenericArg<'tcx>>>,
) -> ty::GenericArgsRef<'tcx> {
let generics = self.generics_of(callee_def_id);
assert_eq!(generics.parent, None);
let opt_const_param = generics.host_effect_index.is_some().then(|| {
ty::GenericArg::from(self.expected_const_effect_param_for_body(caller_def_id))
});
self.mk_args_from_iter(args.into_iter().map(|arg| arg.into()).chain(opt_const_param))
}
}
struct OpaqueTypeExpander<'tcx> {

7
compiler/rustc_mir_build/src/build/matches/test.rs
View File

@ -496,7 +496,12 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
let eq_def_id = self.tcx.require_lang_item(LangItem::PartialEq, Some(source_info.span));
let method = trait_method(self.tcx, eq_def_id, sym::eq, [ty, ty]);
let method = trait_method(
self.tcx,
eq_def_id,
sym::eq,
self.tcx.with_opt_const_effect_param(self.def_id, eq_def_id, [ty, ty]),
);
let bool_ty = self.tcx.types.bool;
let eq_result = self.temp(bool_ty, source_info.span);

12
compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs
View File

@ -258,18 +258,26 @@ impl<'tcx> ConstToPat<'tcx> {
#[instrument(level = "trace", skip(self), ret)]
fn type_has_partial_eq_impl(&self, ty: Ty<'tcx>) -> bool {
let tcx = self.tcx();
// double-check there even *is* a semantic `PartialEq` to dispatch to.
//
// (If there isn't, then we can safely issue a hard
// error, because that's never worked, due to compiler
// using `PartialEq::eq` in this scenario in the past.)
let tcx = self.tcx();
let partial_eq_trait_id = tcx.require_lang_item(hir::LangItem::PartialEq, Some(self.span));
let partial_eq_obligation = Obligation::new(
tcx,
ObligationCause::dummy(),
self.param_env,
ty::TraitRef::new(tcx, partial_eq_trait_id, [ty, ty]),
ty::TraitRef::new(
tcx,
partial_eq_trait_id,
tcx.with_opt_const_effect_param(
tcx.hir().enclosing_body_owner(self.id),
partial_eq_trait_id,
[ty, ty],
),
),
);
// This *could* accept a type that isn't actually `PartialEq`, because region bounds get

11
tests/ui/rfcs/rfc-2632-const-trait-impl/effects/minicore.rs
View File

@ -336,7 +336,7 @@ fn from_str(s: &str) -> Result<bool, ()> {
}
#[lang = "eq"]
// FIXME #[const_trait]
#[const_trait]
trait PartialEq<Rhs: ?Sized = Self> {
fn eq(&self, other: &Rhs) -> bool;
fn ne(&self, other: &Rhs) -> bool {
@ -344,6 +344,15 @@ trait PartialEq<Rhs: ?Sized = Self> {
}
}
impl<A: ?Sized, B: ?Sized> const PartialEq<&B> for &A
where
A: ~const PartialEq<B>,
{
fn eq(&self, other: &&B) -> bool {
PartialEq::eq(*self, *other)
}
}
// FIXME(effects): again, this should not error without Rhs specified
impl PartialEq<str> for str {
fn eq(&self, other: &str) -> bool {

47
tests/ui/rfcs/rfc-2632-const-trait-impl/effects/minicore.stderr
View File

@ -1,24 +1,5 @@
warning: to use a constant of type `&str` in a pattern, the type must implement `PartialEq`
--> $DIR/minicore.rs:332:9
|
LL | "true" => Ok(true),
| ^^^^^^
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #116122 <https://github.com/rust-lang/rust/issues/116122>
= note: `#[warn(const_patterns_without_partial_eq)]` on by default
warning: to use a constant of type `&str` in a pattern, the type must implement `PartialEq`
--> $DIR/minicore.rs:333:9
|
LL | "false" => Ok(false),
| ^^^^^^^
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #116122 <https://github.com/rust-lang/rust/issues/116122>
error[E0493]: destructor of `Self` cannot be evaluated at compile-time
--> $DIR/minicore.rs:494:9
--> $DIR/minicore.rs:503:9
|
LL | *self = source.clone()
| ^^^^^
@ -27,35 +8,13 @@ LL | *self = source.clone()
| value is dropped here
error[E0493]: destructor of `T` cannot be evaluated at compile-time
--> $DIR/minicore.rs:504:35
--> $DIR/minicore.rs:513:35
|
LL | const fn drop<T: ~const Destruct>(_: T) {}
| ^ - value is dropped here
| |
| the destructor for this type cannot be evaluated in constant functions
error: aborting due to 2 previous errors; 2 warnings emitted
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0493`.
Future incompatibility report: Future breakage diagnostic:
warning: to use a constant of type `&str` in a pattern, the type must implement `PartialEq`
--> $DIR/minicore.rs:332:9
|
LL | "true" => Ok(true),
| ^^^^^^
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #116122 <https://github.com/rust-lang/rust/issues/116122>
= note: `#[warn(const_patterns_without_partial_eq)]` on by default
Future breakage diagnostic:
warning: to use a constant of type `&str` in a pattern, the type must implement `PartialEq`
--> $DIR/minicore.rs:333:9
|
LL | "false" => Ok(false),
| ^^^^^^^
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #116122 <https://github.com/rust-lang/rust/issues/116122>
= note: `#[warn(const_patterns_without_partial_eq)]` on by default