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Remove #[default..] and add #[const_trait]

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This commit is contained in:
Deadbeef 2022-03-16 20:49:54 +11:00 committed by Oli Scherer
parent f558990814
commit 257f06587c
30 changed files with 74 additions and 250 deletions
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5
compiler/rustc_const_eval/src/const_eval/machine.rs
View File

@ -277,8 +277,9 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
// sensitive check here. But we can at least rule out functions that are not const
// at all.
if !ecx.tcx.is_const_fn_raw(def.did) {
// allow calling functions marked with #[default_method_body_is_const].
if !ecx.tcx.has_attr(def.did, sym::default_method_body_is_const) {
// allow calling functions inside a trait marked with #[const_trait].
if !matches!(ecx.tcx.trait_of_item(def.did), Some(trait_id) if ecx.tcx.has_attr(trait_id, sym::const_trait))
{
// We certainly do *not* want to actually call the fn
// though, so be sure we return here.
throw_unsup_format!("calling non-const function `{}`", instance)

1
compiler/rustc_const_eval/src/lib.rs
View File

@ -9,6 +9,7 @@ Rust MIR: a lowered representation of Rust.
#![feature(control_flow_enum)]
#![feature(decl_macro)]
#![feature(exact_size_is_empty)]
#![feature(let_chains)]
#![feature(let_else)]
#![feature(map_try_insert)]
#![feature(min_specialization)]

14
compiler/rustc_const_eval/src/transform/check_consts/check.rs
View File

@ -774,13 +774,11 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
}
}
_ if !tcx.is_const_fn_raw(callee) => {
// At this point, it is only legal when the caller is marked with
// #[default_method_body_is_const], and the callee is in the same
// trait.
let callee_trait = tcx.trait_of_item(callee);
if callee_trait.is_some()
&& tcx.has_attr(caller.to_def_id(), sym::default_method_body_is_const)
&& callee_trait == tcx.trait_of_item(caller)
// At this point, it is only legal when the caller is in a trait
// marked with #[const_trait], and the callee is in the same trait.
if let Some(callee_trait) = tcx.trait_of_item(callee)
&& tcx.has_attr(callee_trait, sym::const_trait)
&& Some(callee_trait) == tcx.trait_of_item(caller)
// Can only call methods when it's `<Self as TheTrait>::f`.
&& tcx.types.self_param == substs.type_at(0)
{
@ -875,7 +873,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
if !tcx.is_const_fn_raw(callee) {
if tcx.trait_of_item(callee).is_some() {
if tcx.has_attr(callee, sym::default_method_body_is_const) {
if let Some(callee_trait) = tcx.trait_of_item(callee) && tcx.has_attr(callee_trait, sym::const_trait) {
// To get to here we must have already found a const impl for the
// trait, but for it to still be non-const can be that the impl is
// using default method bodies.

4
compiler/rustc_const_eval/src/transform/check_consts/mod.rs
View File

@ -84,10 +84,10 @@ pub fn rustc_allow_const_fn_unstable(
// functions are subject to more stringent restrictions than "const-unstable" functions: They
// cannot use unstable features and can only call other "const-stable" functions.
pub fn is_const_stable_const_fn(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
// A default body marked const is not const-stable because const
// A default body in a `#[const_trait]` is not const-stable because const
// trait fns currently cannot be const-stable. We shouldn't
// restrict default bodies to only call const-stable functions.
if tcx.has_attr(def_id, sym::default_method_body_is_const) {
if let Some(trait_id) = tcx.trait_of_item(def_id) && tcx.has_attr(trait_id, sym::const_trait) {
return false;
}

7
compiler/rustc_feature/src/builtin_attrs.rs
View File

@ -473,9 +473,10 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
),
// RFC 2632
gated!(
default_method_body_is_const, Normal, template!(Word), WarnFollowing, const_trait_impl,
"`default_method_body_is_const` is a temporary placeholder for declaring default bodies \
as `const`, which may be removed or renamed in the future."
const_trait, Normal, template!(Word), WarnFollowing, const_trait_impl,
"`const` is a temporary placeholder for marking a trait that is suitable for `const` \
`impls` and all default bodies as `const`, which may be removed or renamed in the \
future."
),
// lang-team MCP 147
gated!(

8
compiler/rustc_metadata/src/rmeta/encoder.rs
View File

@ -891,9 +891,11 @@ fn should_encode_mir(tcx: TyCtxt<'_>, def_id: LocalDefId) -> (bool, bool) {
let needs_inline = (generics.requires_monomorphization(tcx)
|| tcx.codegen_fn_attrs(def_id).requests_inline())
&& tcx.sess.opts.output_types.should_codegen();
// The function has a `const` modifier or is annotated with `default_method_body_is_const`.
let is_const_fn = tcx.is_const_fn_raw(def_id.to_def_id())
|| tcx.has_attr(def_id.to_def_id(), sym::default_method_body_is_const);
// The function has a `const` modifier or is in a `#[const_trait]`.
let mut is_const_fn = tcx.is_const_fn_raw(def_id.to_def_id());
if let Some(trait_) = tcx.trait_of_item(def_id.to_def_id()) {
is_const_fn = is_const_fn || tcx.has_attr(trait_, sym::const_trait);
}
let always_encode_mir = tcx.sess.opts.debugging_opts.always_encode_mir;
(is_const_fn, needs_inline || always_encode_mir)
}

4
compiler/rustc_middle/src/hir/map/mod.rs
View File

@ -494,9 +494,7 @@ impl<'hir> Map<'hir> {
BodyOwnerKind::Fn if self.tcx.is_const_fn_raw(def_id.to_def_id()) => {
ConstContext::ConstFn
}
BodyOwnerKind::Fn
if self.tcx.has_attr(def_id.to_def_id(), sym::default_method_body_is_const) =>
{
BodyOwnerKind::Fn if matches!(self.tcx.trait_of_item(def_id.to_def_id()), Some(trait_id) if self.tcx.has_attr(trait_id, sym::const_trait)) => {
ConstContext::ConstFn
}
BodyOwnerKind::Fn | BodyOwnerKind::Closure => return None,

23
compiler/rustc_passes/src/check_attr.rs
View File

@ -121,9 +121,7 @@ impl CheckAttrVisitor<'_> {
| sym::rustc_if_this_changed
| sym::rustc_then_this_would_need => self.check_rustc_dirty_clean(&attr),
sym::cmse_nonsecure_entry => self.check_cmse_nonsecure_entry(attr, span, target),
sym::default_method_body_is_const => {
self.check_default_method_body_is_const(attr, span, target)
}
sym::const_trait => self.check_const_trait(attr, span, target),
sym::must_not_suspend => self.check_must_not_suspend(&attr, span, target),
sym::must_use => self.check_must_use(hir_id, &attr, span, target),
sym::rustc_pass_by_value => self.check_pass_by_value(&attr, span, target),
@ -2081,23 +2079,14 @@ impl CheckAttrVisitor<'_> {
}
}
/// default_method_body_is_const should only be applied to trait methods with default bodies.
fn check_default_method_body_is_const(
&self,
attr: &Attribute,
span: Span,
target: Target,
) -> bool {
/// `#[const_trait]` only applies to traits.
fn check_const_trait(&self, attr: &Attribute, _span: Span, target: Target) -> bool {
match target {
Target::Method(MethodKind::Trait { body: true }) => true,
Target::Trait => true,
_ => {
self.tcx
.sess
.struct_span_err(
attr.span,
"attribute should be applied to a trait method with body",
)
.span_label(span, "not a trait method or missing a body")
.struct_span_err(attr.span, "attribute should be applied to a trait")
.emit();
false
}
@ -2191,6 +2180,8 @@ impl CheckAttrVisitor<'_> {
"attribute `{}` without any lints has no effect",
attr.name_or_empty()
)
} else if attr.name_or_empty() == sym::default_method_body_is_const {
format!("`default_method_body_is_const` has been removed")
} else {
return;
};

62
compiler/rustc_passes/src/check_const.rs
View File

@ -13,7 +13,6 @@ use rustc_hir as hir;
use rustc_hir::def_id::LocalDefId;
use rustc_hir::intravisit::{self, Visitor};
use rustc_middle::hir::nested_filter;
use rustc_middle::ty;
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::TyCtxt;
use rustc_session::parse::feature_err;
@ -64,66 +63,6 @@ pub(crate) fn provide(providers: &mut Providers) {
*providers = Providers { check_mod_const_bodies, ..*providers };
}
fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) {
let _: Option<_> = try {
if let hir::ItemKind::Impl(ref imp) = item.kind && let hir::Constness::Const = imp.constness {
let trait_def_id = imp.of_trait.as_ref()?.trait_def_id()?;
let ancestors = tcx
.trait_def(trait_def_id)
.ancestors(tcx, item.def_id.to_def_id())
.ok()?;
let mut to_implement = Vec::new();
for trait_item in tcx.associated_items(trait_def_id).in_definition_order()
{
if let ty::AssocItem {
kind: ty::AssocKind::Fn,
defaultness,
def_id: trait_item_id,
..
} = *trait_item
{
// we can ignore functions that do not have default bodies:
// if those are unimplemented it will be caught by typeck.
if !defaultness.has_value()
|| tcx
.has_attr(trait_item_id, sym::default_method_body_is_const)
{
continue;
}
let is_implemented = ancestors
.leaf_def(tcx, trait_item_id)
.map(|node_item| !node_item.defining_node.is_from_trait())
.unwrap_or(false);
if !is_implemented {
to_implement.push(trait_item_id);
}
}
}
// all nonconst trait functions (not marked with #[default_method_body_is_const])
// must be implemented
if !to_implement.is_empty() {
let not_implemented = to_implement
.into_iter()
.map(|did| tcx.item_name(did).to_string())
.collect::<Vec<_>>()
.join("`, `");
tcx
.sess
.struct_span_err(
item.span,
"const trait implementations may not use non-const default functions",
)
.note(&format!("`{}` not implemented", not_implemented))
.emit();
}
}
};
}
#[derive(Copy, Clone)]
struct CheckConstVisitor<'tcx> {
tcx: TyCtxt<'tcx>,
@ -254,7 +193,6 @@ impl<'tcx> Visitor<'tcx> for CheckConstVisitor<'tcx> {
fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
intravisit::walk_item(self, item);
check_item(self.tcx, item);
}
fn visit_anon_const(&mut self, anon: &'tcx hir::AnonConst) {

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

@ -504,6 +504,7 @@ symbols! {
const_raw_ptr_deref,
const_raw_ptr_to_usize_cast,
const_refs_to_cell,
const_trait,
const_trait_bound_opt_out,
const_trait_impl,
const_transmute,

4
compiler/rustc_ty_utils/src/ty.rs
View File

@ -152,9 +152,7 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> {
let constness = match hir_id {
Some(hir_id) => match tcx.hir().get(hir_id) {
hir::Node::TraitItem(hir::TraitItem { kind: hir::TraitItemKind::Fn(..), .. })
if tcx.has_attr(def_id, sym::default_method_body_is_const) =>
{
hir::Node::TraitItem(hir::TraitItem { kind: hir::TraitItemKind::Fn(..), .. }) if matches!(tcx.trait_of_item(def_id), Some(trait_id) if tcx.has_attr(trait_id, sym::const_trait)) => {
hir::Constness::Const
}

3
library/core/src/clone.rs
View File

@ -107,6 +107,7 @@ use crate::marker::Destruct;
#[lang = "clone"]
#[rustc_diagnostic_item = "Clone"]
#[rustc_trivial_field_reads]
#[cfg_attr(not(bootstrap), const_trait)]
pub trait Clone: Sized {
/// Returns a copy of the value.
///
@ -129,7 +130,7 @@ pub trait Clone: Sized {
/// allocations.
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
#[default_method_body_is_const]
#[cfg_attr(bootstrap, default_method_body_is_const)]
fn clone_from(&mut self, source: &Self)
where
Self: ~const Destruct,

12
library/core/src/cmp.rs
View File

@ -214,6 +214,7 @@ use self::Ordering::*;
append_const_msg,
)
)]
#[cfg_attr(not(bootstrap), const_trait)]
#[rustc_diagnostic_item = "PartialEq"]
pub trait PartialEq<Rhs: ?Sized = Self> {
/// This method tests for `self` and `other` values to be equal, and is used
@ -226,7 +227,7 @@ pub trait PartialEq<Rhs: ?Sized = Self> {
#[inline]
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
#[default_method_body_is_const]
#[cfg_attr(bootstrap, default_method_body_is_const)]
fn ne(&self, other: &Rhs) -> bool {
!self.eq(other)
}
@ -1053,6 +1054,7 @@ impl PartialOrd for Ordering {
append_const_msg,
)
)]
#[cfg_attr(not(bootstrap), const_trait)]
#[rustc_diagnostic_item = "PartialOrd"]
pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
/// This method returns an ordering between `self` and `other` values if one exists.
@ -1096,7 +1098,7 @@ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
#[inline]
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
#[default_method_body_is_const]
#[cfg_attr(bootstrap, default_method_body_is_const)]
fn lt(&self, other: &Rhs) -> bool {
matches!(self.partial_cmp(other), Some(Less))
}
@ -1116,7 +1118,7 @@ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
#[inline]
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
#[default_method_body_is_const]
#[cfg_attr(bootstrap, default_method_body_is_const)]
fn le(&self, other: &Rhs) -> bool {
// Pattern `Some(Less | Eq)` optimizes worse than negating `None | Some(Greater)`.
// FIXME: The root cause was fixed upstream in LLVM with:
@ -1139,7 +1141,7 @@ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
#[inline]
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
#[default_method_body_is_const]
#[cfg_attr(bootstrap, default_method_body_is_const)]
fn gt(&self, other: &Rhs) -> bool {
matches!(self.partial_cmp(other), Some(Greater))
}
@ -1159,7 +1161,7 @@ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
#[inline]
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
#[default_method_body_is_const]
#[cfg_attr(bootstrap, default_method_body_is_const)]
fn ge(&self, other: &Rhs) -> bool {
matches!(self.partial_cmp(other), Some(Greater | Equal))
}

2
src/test/rustdoc/rfc-2632-const-trait-impl.rs
View File

@ -16,12 +16,12 @@ pub struct S<T>(T);
// @has - '//pre[@class="rust trait"]/code/a[@class="trait"]' 'Clone'
// @!has - '//pre[@class="rust trait"]/code/span[@class="where"]' '~const'
// @has - '//pre[@class="rust trait"]/code/span[@class="where"]' ': Clone'
#[const_trait]
pub trait Tr<T> {
// @!has - '//div[@id="method.a"]/h4[@class="code-header"]' '~const'
// @has - '//div[@id="method.a"]/h4[@class="code-header"]/a[@class="trait"]' 'Clone'
// @!has - '//div[@id="method.a"]/h4[@class="code-header"]/span[@class="where"]' '~const'
// @has - '//div[@id="method.a"]/h4[@class="code-header"]/span[@class="where fmt-newline"]' ': Clone'
#[default_method_body_is_const]
fn a<A: ~const Clone + ~const Destruct>()
where
Option<A>: ~const Clone + ~const Destruct,

11
src/test/ui/rfc-2632-const-trait-impl/attr-misuse.rs
View File

@ -1,13 +1,10 @@
#![feature(const_trait_impl)]
#[default_method_body_is_const] //~ ERROR attribute should be applied
#[const_trait]
trait A {
#[default_method_body_is_const] //~ ERROR attribute should be applied
fn no_body(self);
#[default_method_body_is_const]
fn correct_use(&self) {}
#[const_trait] //~ ERROR attribute should be applied
fn foo(self);
}
#[default_method_body_is_const] //~ ERROR attribute should be applied
#[const_trait] //~ ERROR attribute should be applied
fn main() {}

34
src/test/ui/rfc-2632-const-trait-impl/attr-misuse.stderr
View File

@ -1,32 +1,14 @@
error: attribute should be applied to a trait method with body
--> $DIR/attr-misuse.rs:3:1
error: attribute should be applied to a trait
--> $DIR/attr-misuse.rs:9:1
|
LL | #[default_method_body_is_const]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | / trait A {
LL | | #[default_method_body_is_const]
LL | | fn no_body(self);
LL | |
LL | | #[default_method_body_is_const]
LL | | fn correct_use(&self) {}
LL | | }
| |_- not a trait method or missing a body
LL | #[const_trait]
| ^^^^^^^^^^^^^^
error: attribute should be applied to a trait method with body
--> $DIR/attr-misuse.rs:12:1
|
LL | #[default_method_body_is_const]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | fn main() {}
| ------------ not a trait method or missing a body
error: attribute should be applied to a trait method with body
error: attribute should be applied to a trait
--> $DIR/attr-misuse.rs:5:5
|
LL | #[default_method_body_is_const]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | fn no_body(self);
| ----------------- not a trait method or missing a body
LL | #[const_trait]
| ^^^^^^^^^^^^^^
error: aborting due to 3 previous errors
error: aborting due to 2 previous errors

2
src/test/ui/rfc-2632-const-trait-impl/auxiliary/cross-crate.rs
View File

@ -1,7 +1,7 @@
#![feature(const_trait_impl)]
#[const_trait]
pub trait MyTrait {
#[default_method_body_is_const]
fn defaulted_func(&self) {}
fn func(self);
}

6
src/test/ui/rfc-2632-const-trait-impl/const-and-non-const-impl.rs
View File

@ -2,7 +2,7 @@
pub struct Int(i32);
impl const std::ops::Add for i32 { //~ ERROR type annotations needed
impl const std::ops::Add for i32 {
//~^ ERROR only traits defined in the current crate can be implemented for primitive types
type Output = Self;
@ -11,7 +11,7 @@ impl const std::ops::Add for i32 { //~ ERROR type annotations needed
}
}
impl std::ops::Add for Int { //~ ERROR type annotations needed
impl std::ops::Add for Int {
type Output = Self;
fn add(self, rhs: Self) -> Self {
@ -19,7 +19,7 @@ impl std::ops::Add for Int { //~ ERROR type annotations needed
}
}
impl const std::ops::Add for Int { //~ ERROR type annotations needed
impl const std::ops::Add for Int {
//~^ ERROR conflicting implementations of trait
type Output = Self;

47
src/test/ui/rfc-2632-const-trait-impl/const-and-non-const-impl.stderr
View File

@ -19,50 +19,7 @@ LL | impl std::ops::Add for Int {
LL | impl const std::ops::Add for Int {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Int`
error[E0283]: type annotations needed
--> $DIR/const-and-non-const-impl.rs:5:12
|
LL | impl const std::ops::Add for i32 {
| ^^^^^^^^^^^^^ cannot infer type for type `i32`
|
note: multiple `impl`s satisfying `i32: Add` found
--> $DIR/const-and-non-const-impl.rs:5:1
|
LL | impl const std::ops::Add for i32 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: and another `impl` found in the `core` crate: `impl Add for i32;`
error: aborting due to 2 previous errors
error[E0283]: type annotations needed
--> $DIR/const-and-non-const-impl.rs:14:6
|
LL | impl std::ops::Add for Int {
| ^^^^^^^^^^^^^ cannot infer type for struct `Int`
|
note: multiple `impl`s satisfying `Int: Add` found
--> $DIR/const-and-non-const-impl.rs:14:1
|
LL | impl std::ops::Add for Int {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
...
LL | impl const std::ops::Add for Int {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0283]: type annotations needed
--> $DIR/const-and-non-const-impl.rs:22:12
|
LL | impl const std::ops::Add for Int {
| ^^^^^^^^^^^^^ cannot infer type for struct `Int`
|
note: multiple `impl`s satisfying `Int: Add` found
--> $DIR/const-and-non-const-impl.rs:14:1
|
LL | impl std::ops::Add for Int {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
...
LL | impl const std::ops::Add for Int {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0117, E0119, E0283.
Some errors have detailed explanations: E0117, E0119.
For more information about an error, try `rustc --explain E0117`.

2
src/test/ui/rfc-2632-const-trait-impl/const-default-method-bodies.rs
View File

@ -1,9 +1,9 @@
#![feature(const_trait_impl)]
#[const_trait]
trait ConstDefaultFn: Sized {
fn b(self);
#[default_method_body_is_const]
fn a(self) {
self.b();
}

2
src/test/ui/rfc-2632-const-trait-impl/cross-crate-default-method-body-is-const.rs
View File

@ -1,4 +1,4 @@
// This tests that `default_method_body_is_const` methods can
// This tests that `const_trait` default methods can
// be called from a const context when used across crates.
//
// check-pass

2
src/test/ui/rfc-2632-const-trait-impl/default-method-body-is-const-body-checking.rs
View File

@ -5,8 +5,8 @@ impl Tr for () {}
const fn foo<T>() where T: ~const Tr {}
#[const_trait]
pub trait Foo {
#[default_method_body_is_const]
fn foo() {
foo::<()>();
//~^ ERROR the trait bound `(): ~const Tr` is not satisfied

3
src/test/ui/rfc-2632-const-trait-impl/default-method-body-is-const-same-trait-ck.rs
View File

@ -1,10 +1,9 @@
#![feature(const_trait_impl)]
#[const_trait]
pub trait Tr {
#[default_method_body_is_const]
fn a(&self) {}
#[default_method_body_is_const]
fn b(&self) {
().a()
//~^ ERROR the trait bound

6
src/test/ui/rfc-2632-const-trait-impl/default-method-body-is-const-same-trait-ck.stderr
View File

@ -1,17 +1,17 @@
error[E0277]: the trait bound `(): ~const Tr` is not satisfied
--> $DIR/default-method-body-is-const-same-trait-ck.rs:9:12
--> $DIR/default-method-body-is-const-same-trait-ck.rs:8:12
|
LL | ().a()
| ^^^ the trait `~const Tr` is not implemented for `()`
|
note: the trait `Tr` is implemented for `()`, but that implementation is not `const`
--> $DIR/default-method-body-is-const-same-trait-ck.rs:9:12
--> $DIR/default-method-body-is-const-same-trait-ck.rs:8:12
|
LL | ().a()
| ^^^
error[E0015]: cannot call non-const fn `<() as Tr>::a` in constant functions
--> $DIR/default-method-body-is-const-same-trait-ck.rs:9:12
--> $DIR/default-method-body-is-const-same-trait-ck.rs:8:12
|
LL | ().a()
| ^^^

2
src/test/ui/rfc-2632-const-trait-impl/default-method-body-is-const-with-staged-api.rs
View File

@ -9,8 +9,8 @@
#![feature(const_trait_impl)]
#![stable(since = "1", feature = "foo")]
#[const_trait]
trait Tr {
#[default_method_body_is_const]
fn a() {}
}

19
src/test/ui/rfc-2632-const-trait-impl/impl-with-default-fn-fail.rs
View File

@ -1,32 +1,17 @@
#![feature(const_trait_impl)]
#[const_trait]
trait Tr {
fn req(&self);
fn prov(&self) {
println!("lul");
self.req();
}
#[default_method_body_is_const]
fn default() {}
}
struct S;
impl const Tr for S {
fn req(&self) {}
} //~^^ ERROR const trait implementations may not use non-const default functions
impl const Tr for u16 {
fn prov(&self) {}
fn default() {}
} //~^^^ ERROR not all trait items implemented
} //~^^ ERROR not all trait items implemented
impl const Tr for u32 {
fn req(&self) {}
fn default() {}
} //~^^^ ERROR const trait implementations may not use non-const default functions
fn main() {}

25
src/test/ui/rfc-2632-const-trait-impl/impl-with-default-fn-fail.stderr
View File

@ -1,26 +1,5 @@
error: const trait implementations may not use non-const default functions
--> $DIR/impl-with-default-fn-fail.rs:17:1
|
LL | / impl const Tr for S {
LL | | fn req(&self) {}
LL | | }
| |_^
|
= note: `prov` not implemented
error: const trait implementations may not use non-const default functions
--> $DIR/impl-with-default-fn-fail.rs:27:1
|
LL | / impl const Tr for u32 {
LL | | fn req(&self) {}
LL | | fn default() {}
LL | | }
| |_^
|
= note: `prov` not implemented
error[E0046]: not all trait items implemented, missing: `req`
--> $DIR/impl-with-default-fn-fail.rs:21:1
--> $DIR/impl-with-default-fn-fail.rs:12:1
|
LL | fn req(&self);
| -------------- `req` from trait
@ -28,6 +7,6 @@ LL | fn req(&self);
LL | impl const Tr for u16 {
| ^^^^^^^^^^^^^^^^^^^^^ missing `req` in implementation
error: aborting due to 3 previous errors
error: aborting due to previous error
For more information about this error, try `rustc --explain E0046`.

9
src/test/ui/rfc-2632-const-trait-impl/impl-with-default-fn-pass.rs
View File

@ -2,28 +2,21 @@
#![feature(const_trait_impl)]
#[const_trait]
trait Tr {
fn req(&self);
fn prov(&self) {
println!("lul");
self.req();
}
#[default_method_body_is_const]
fn default() {}
}
impl const Tr for u8 {
fn req(&self) {}
fn prov(&self) {}
}
macro_rules! impl_tr {
($ty: ty) => {
impl const Tr for $ty {
fn req(&self) {}
fn prov(&self) {}
}
}
}

2
src/test/ui/rfc-2632-const-trait-impl/trait-default-body-stability.rs
View File

@ -37,8 +37,8 @@ impl const FromResidual for T {
}
#[stable(feature = "foo", since = "1.0")]
#[const_trait]
pub trait Tr {
#[default_method_body_is_const]
#[stable(feature = "foo", since = "1.0")]
fn bar() -> T {
T?

2
src/test/ui/rfc-2632-const-trait-impl/trait-where-clause-run.rs
View File

@ -6,8 +6,8 @@ trait Bar {
fn bar() -> u8;
}
#[const_trait]
trait Foo {
#[default_method_body_is_const]
fn foo() -> u8 where Self: ~const Bar {
<Self as Bar>::bar() * 6
}