rpms/rust
3
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Prevent unsound coercions from functions with opaque return types.

Browse Source
This commit is contained in:
Josh Stone 2022-07-13 12:50:50 -07:00
parent da6e6dd42c
commit 9079a8b665
2 changed files with 855 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
rust.spec
View File

@ -84,7 +84,7 @@
Name: rust
Version: 1.62.0
Release: 1%{?dist}
Release: 2%{?dist}
Summary: The Rust Programming Language
License: (ASL 2.0 or MIT) and (BSD and MIT)
# ^ written as: (rust itself) and (bundled libraries)
@ -106,6 +106,10 @@ Patch1: 0001-Use-lld-provided-by-system-for-wasm.patch
# Set a substitute-path in rust-gdb for standard library sources.
Patch2: rustc-1.61.0-rust-gdb-substitute-path.patch
# Prevent unsound coercions from functions with opaque return types.
# https://github.com/rust-lang/rust/pull/98614
Patch3: rustc-1.62.0-pr98614.patch
### RHEL-specific patches below ###
# Simple rpm macros for rust-toolset (as opposed to full rust-packaging)
@ -571,6 +575,7 @@ test -f '%{local_rust_root}/bin/rustc'
%patch1 -p1
%patch2 -p1
%patch3 -p1
%if %with disabled_libssh2
%patch100 -p1
@ -1029,6 +1034,9 @@ end}
%changelog
* Wed Jul 13 2022 Josh Stone <jistone@redhat.com> - 1.62.0-2
- Prevent unsound coercions from functions with opaque return types.
* Thu Jun 30 2022 Josh Stone <jistone@redhat.com> - 1.62.0-1
- Update to 1.62.0.

846
rustc-1.62.0-pr98614.patch Normal file
View File

@ -0,0 +1,846 @@
From 3dfd37fcd387c18205a93ad2ad519c2ab5e1b289 Mon Sep 17 00:00:00 2001
From: Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de>
Date: Wed, 29 Jun 2022 14:25:44 +0000
Subject: [PATCH 1/7] pessimistically treat all function items as containing an
opaque type
(cherry picked from commit 9dbfcbcbb5d835c2a5784e2f4da4816b90c43ff5)
---
compiler/rustc_middle/src/ty/flags.rs | 5 +++++
.../issue-53398-cyclic-types.rs | 2 +-
.../issue-53398-cyclic-types.stderr | 4 +---
.../ui/type-alias-impl-trait/issue-98604.rs | 13 +++++++++++++
.../type-alias-impl-trait/issue-98604.stderr | 18 ++++++++++++++++++
.../ui/type-alias-impl-trait/issue-98608.rs | 9 +++++++++
.../type-alias-impl-trait/issue-98608.stderr | 16 ++++++++++++++++
7 files changed, 63 insertions(+), 4 deletions(-)
create mode 100644 src/test/ui/type-alias-impl-trait/issue-98604.rs
create mode 100644 src/test/ui/type-alias-impl-trait/issue-98604.stderr
create mode 100644 src/test/ui/type-alias-impl-trait/issue-98608.rs
create mode 100644 src/test/ui/type-alias-impl-trait/issue-98608.stderr
diff --git a/compiler/rustc_middle/src/ty/flags.rs b/compiler/rustc_middle/src/ty/flags.rs
index 7a3d615862cb..63b1352e66b8 100644
--- a/compiler/rustc_middle/src/ty/flags.rs
+++ b/compiler/rustc_middle/src/ty/flags.rs
@@ -207,6 +207,11 @@ fn add_kind(&mut self, kind: &ty::TyKind<'_>) {
&ty::FnDef(_, substs) => {
self.add_substs(substs);
+ // HACK(#98608, oli-obk): Function items with opaque types in their signature will
+ // end up not having the HAS_TY_OPAQUE flag set, causing `evaluate_obligation` to
+ // optimistically assume the function item matches any signature. See documentation
+ // on `HAS_FREE_LOCAL_NAMES` for details.
+ self.add_flags(TypeFlags::HAS_TY_OPAQUE);
}
&ty::FnPtr(fn_sig) => self.bound_computation(fn_sig, |computation, fn_sig| {
diff --git a/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.rs b/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.rs
index 6c838f410036..4bc0f9d92008 100644
--- a/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.rs
@@ -3,7 +3,7 @@
type Foo = impl Fn() -> Foo;
fn foo() -> Foo {
- foo //~ ERROR: overflow evaluating the requirement `fn() -> Foo {foo}: Sized`
+ foo //~ ERROR: overflow evaluating the requirement `<fn() -> Foo {foo} as FnOnce<()>>::Output == fn() -> Foo {foo}`
}
fn main() {}
diff --git a/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.stderr b/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.stderr
index a9c2c18630c0..f69514b7808f 100644
--- a/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.stderr
@@ -1,10 +1,8 @@
-error[E0275]: overflow evaluating the requirement `fn() -> Foo {foo}: Sized`
+error[E0275]: overflow evaluating the requirement `<fn() -> Foo {foo} as FnOnce<()>>::Output == fn() -> Foo {foo}`
--> $DIR/issue-53398-cyclic-types.rs:6:5
|
LL | foo
| ^^^
- |
- = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`issue_53398_cyclic_types`)
error: aborting due to previous error
diff --git a/src/test/ui/type-alias-impl-trait/issue-98604.rs b/src/test/ui/type-alias-impl-trait/issue-98604.rs
new file mode 100644
index 000000000000..a4fd8a82a04f
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-98604.rs
@@ -0,0 +1,13 @@
+// edition:2018
+
+type AsyncFnPtr = Box<
+ dyn Fn() -> std::pin::Pin<Box<dyn std::future::Future<Output = ()>>>,
+>;
+
+async fn test() {}
+
+#[allow(unused_must_use)]
+fn main() {
+ Box::new(test) as AsyncFnPtr;
+ //~^ ERROR type mismatch
+}
diff --git a/src/test/ui/type-alias-impl-trait/issue-98604.stderr b/src/test/ui/type-alias-impl-trait/issue-98604.stderr
new file mode 100644
index 000000000000..f04d1b4d7877
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-98604.stderr
@@ -0,0 +1,18 @@
+error[E0271]: type mismatch resolving `<fn() -> impl Future<Output = ()> {test} as FnOnce<()>>::Output == Pin<Box<(dyn Future<Output = ()> + 'static)>>`
+ --> $DIR/issue-98604.rs:11:5
+ |
+LL | Box::new(test) as AsyncFnPtr;
+ | ^^^^^^^^^^^^^^ expected struct `Pin`, found opaque type
+ |
+note: while checking the return type of the `async fn`
+ --> $DIR/issue-98604.rs:7:17
+ |
+LL | async fn test() {}
+ | ^ checked the `Output` of this `async fn`, found opaque type
+ = note: expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
+ found opaque type `impl Future<Output = ()>`
+ = note: required for the cast from `fn() -> impl Future<Output = ()> {test}` to the object type `dyn Fn() -> Pin<Box<(dyn Future<Output = ()> + 'static)>>`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0271`.
diff --git a/src/test/ui/type-alias-impl-trait/issue-98608.rs b/src/test/ui/type-alias-impl-trait/issue-98608.rs
new file mode 100644
index 000000000000..d75762a8b62f
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-98608.rs
@@ -0,0 +1,9 @@
+fn hi() -> impl Sized { std::ptr::null::<u8>() }
+
+fn main() {
+ let b: Box<dyn Fn() -> Box<u8>> = Box::new(hi);
+ //~^ ERROR type mismatch resolving `<fn() -> impl Sized {hi} as FnOnce<()>>::Output == Box<u8>`
+ let boxed = b();
+ let null = *boxed;
+ println!("{null:?}");
+}
diff --git a/src/test/ui/type-alias-impl-trait/issue-98608.stderr b/src/test/ui/type-alias-impl-trait/issue-98608.stderr
new file mode 100644
index 000000000000..8f3ec7d9d161
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-98608.stderr
@@ -0,0 +1,16 @@
+error[E0271]: type mismatch resolving `<fn() -> impl Sized {hi} as FnOnce<()>>::Output == Box<u8>`
+ --> $DIR/issue-98608.rs:4:39
+ |
+LL | fn hi() -> impl Sized { std::ptr::null::<u8>() }
+ | ---------- the found opaque type
+...
+LL | let b: Box<dyn Fn() -> Box<u8>> = Box::new(hi);
+ | ^^^^^^^^^^^^ expected struct `Box`, found opaque type
+ |
+ = note: expected struct `Box<u8>`
+ found opaque type `impl Sized`
+ = note: required for the cast from `fn() -> impl Sized {hi}` to the object type `dyn Fn() -> Box<u8>`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0271`.
--
2.36.1
From f2572a99471d046bef973512026b682bbd60fc1d Mon Sep 17 00:00:00 2001
From: Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de>
Date: Thu, 30 Jun 2022 13:24:35 +0000
Subject: [PATCH 2/7] use a method instead of manually doing what its body does
(cherry picked from commit ade2a96ff1e2c3d434f57b8fa07da66969bceaae)
---
compiler/rustc_infer/src/traits/project.rs | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/compiler/rustc_infer/src/traits/project.rs b/compiler/rustc_infer/src/traits/project.rs
index b84ed3dc6893..18469208731c 100644
--- a/compiler/rustc_infer/src/traits/project.rs
+++ b/compiler/rustc_infer/src/traits/project.rs
@@ -203,7 +203,7 @@ pub fn complete(&mut self, key: ProjectionCacheKey<'tcx>, result: EvaluationResu
Some(&ProjectionCacheEntry::NormalizedTy { ref ty, complete: _ }) => {
info!("ProjectionCacheEntry::complete({:?}) - completing {:?}", key, ty);
let mut ty = ty.clone();
- if result == EvaluationResult::EvaluatedToOk {
+ if result.must_apply_considering_regions() {
ty.obligations = vec![];
}
map.insert(key, ProjectionCacheEntry::NormalizedTy { ty, complete: Some(result) });
--
2.36.1
From 2c7eb77c52989ea098e8b50e97d62ff4a3dc6c97 Mon Sep 17 00:00:00 2001
From: Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de>
Date: Thu, 30 Jun 2022 14:23:31 +0000
Subject: [PATCH 3/7] Make `evaluate_obligation` not succeed unconditionally if
it registered new hidden types for opaque types
(cherry picked from commit 84fc5516648e34f15d17b2ca0b892adb3743a5c0)
---
compiler/rustc_infer/src/infer/mod.rs | 4 ++++
compiler/rustc_infer/src/infer/undo_log.rs | 4 ++++
compiler/rustc_middle/src/traits/select.rs | 18 ++++++++++++++----
compiler/rustc_middle/src/ty/flags.rs | 5 -----
.../src/traits/error_reporting/suggestions.rs | 1 +
.../src/traits/select/mod.rs | 4 ++++
.../issue-53398-cyclic-types.rs | 2 +-
.../issue-53398-cyclic-types.stderr | 4 +++-
8 files changed, 31 insertions(+), 11 deletions(-)
diff --git a/compiler/rustc_infer/src/infer/mod.rs b/compiler/rustc_infer/src/infer/mod.rs
index c9121f7d348c..989cc551a82f 100644
--- a/compiler/rustc_infer/src/infer/mod.rs
+++ b/compiler/rustc_infer/src/infer/mod.rs
@@ -929,6 +929,10 @@ pub fn region_constraints_added_in_snapshot(
.region_constraints_added_in_snapshot(&snapshot.undo_snapshot)
}
+ pub fn opaque_types_added_in_snapshot(&self, snapshot: &CombinedSnapshot<'a, 'tcx>) -> bool {
+ self.inner.borrow().undo_log.opaque_types_in_snapshot(&snapshot.undo_snapshot)
+ }
+
pub fn add_given(&self, sub: ty::Region<'tcx>, sup: ty::RegionVid) {
self.inner.borrow_mut().unwrap_region_constraints().add_given(sub, sup);
}
diff --git a/compiler/rustc_infer/src/infer/undo_log.rs b/compiler/rustc_infer/src/infer/undo_log.rs
index 1b696f21cbcf..74a26ebc39f8 100644
--- a/compiler/rustc_infer/src/infer/undo_log.rs
+++ b/compiler/rustc_infer/src/infer/undo_log.rs
@@ -185,6 +185,10 @@ pub(crate) fn region_constraints_in_snapshot(
})
}
+ pub(crate) fn opaque_types_in_snapshot(&self, s: &Snapshot<'tcx>) -> bool {
+ self.logs[s.undo_len..].iter().any(|log| matches!(log, UndoLog::OpaqueTypes(..)))
+ }
+
pub(crate) fn region_constraints(
&self,
) -> impl Iterator<Item = &'_ region_constraints::UndoLog<'tcx>> + Clone {
diff --git a/compiler/rustc_middle/src/traits/select.rs b/compiler/rustc_middle/src/traits/select.rs
index ffa70cddbd59..025059fcbcfb 100644
--- a/compiler/rustc_middle/src/traits/select.rs
+++ b/compiler/rustc_middle/src/traits/select.rs
@@ -174,6 +174,10 @@ pub enum SelectionCandidate<'tcx> {
pub enum EvaluationResult {
/// Evaluation successful.
EvaluatedToOk,
+ /// Evaluation successful, but need to rerun because opaque types got
+ /// hidden types assigned without it being known whether the opaque types
+ /// are within their defining scope
+ EvaluatedToOkModuloOpaqueTypes,
/// Evaluation successful, but there were unevaluated region obligations.
EvaluatedToOkModuloRegions,
/// Evaluation is known to be ambiguous -- it *might* hold for some
@@ -252,9 +256,11 @@ pub fn must_apply_modulo_regions(self) -> bool {
pub fn may_apply(self) -> bool {
match self {
- EvaluatedToOk | EvaluatedToOkModuloRegions | EvaluatedToAmbig | EvaluatedToUnknown => {
- true
- }
+ EvaluatedToOkModuloOpaqueTypes
+ | EvaluatedToOk
+ | EvaluatedToOkModuloRegions
+ | EvaluatedToAmbig
+ | EvaluatedToUnknown => true,
EvaluatedToErr | EvaluatedToRecur => false,
}
@@ -264,7 +270,11 @@ pub fn is_stack_dependent(self) -> bool {
match self {
EvaluatedToUnknown | EvaluatedToRecur => true,
- EvaluatedToOk | EvaluatedToOkModuloRegions | EvaluatedToAmbig | EvaluatedToErr => false,
+ EvaluatedToOkModuloOpaqueTypes
+ | EvaluatedToOk
+ | EvaluatedToOkModuloRegions
+ | EvaluatedToAmbig
+ | EvaluatedToErr => false,
}
}
}
diff --git a/compiler/rustc_middle/src/ty/flags.rs b/compiler/rustc_middle/src/ty/flags.rs
index 63b1352e66b8..7a3d615862cb 100644
--- a/compiler/rustc_middle/src/ty/flags.rs
+++ b/compiler/rustc_middle/src/ty/flags.rs
@@ -207,11 +207,6 @@ fn add_kind(&mut self, kind: &ty::TyKind<'_>) {
&ty::FnDef(_, substs) => {
self.add_substs(substs);
- // HACK(#98608, oli-obk): Function items with opaque types in their signature will
- // end up not having the HAS_TY_OPAQUE flag set, causing `evaluate_obligation` to
- // optimistically assume the function item matches any signature. See documentation
- // on `HAS_FREE_LOCAL_NAMES` for details.
- self.add_flags(TypeFlags::HAS_TY_OPAQUE);
}
&ty::FnPtr(fn_sig) => self.bound_computation(fn_sig, |computation, fn_sig| {
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
index d20ba99ebc9b..60cb5914dada 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
+++ b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
@@ -761,6 +761,7 @@ fn suggest_fn_call(
Ok(
EvaluationResult::EvaluatedToOk
| EvaluationResult::EvaluatedToOkModuloRegions
+ | EvaluationResult::EvaluatedToOkModuloOpaqueTypes
| EvaluationResult::EvaluatedToAmbig,
) => {}
_ => return false,
diff --git a/compiler/rustc_trait_selection/src/traits/select/mod.rs b/compiler/rustc_trait_selection/src/traits/select/mod.rs
index 1c9f83f8f340..ed4877638bff 100644
--- a/compiler/rustc_trait_selection/src/traits/select/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs
@@ -388,6 +388,10 @@ fn evaluation_probe(
Err(_) => return Ok(EvaluatedToErr),
}
+ if self.infcx.opaque_types_added_in_snapshot(snapshot) {
+ return Ok(result.max(EvaluatedToOkModuloOpaqueTypes));
+ }
+
match self.infcx.region_constraints_added_in_snapshot(snapshot) {
None => Ok(result),
Some(_) => Ok(result.max(EvaluatedToOkModuloRegions)),
diff --git a/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.rs b/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.rs
index 4bc0f9d92008..6c838f410036 100644
--- a/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.rs
@@ -3,7 +3,7 @@
type Foo = impl Fn() -> Foo;
fn foo() -> Foo {
- foo //~ ERROR: overflow evaluating the requirement `<fn() -> Foo {foo} as FnOnce<()>>::Output == fn() -> Foo {foo}`
+ foo //~ ERROR: overflow evaluating the requirement `fn() -> Foo {foo}: Sized`
}
fn main() {}
diff --git a/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.stderr b/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.stderr
index f69514b7808f..a9c2c18630c0 100644
--- a/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-53398-cyclic-types.stderr
@@ -1,8 +1,10 @@
-error[E0275]: overflow evaluating the requirement `<fn() -> Foo {foo} as FnOnce<()>>::Output == fn() -> Foo {foo}`
+error[E0275]: overflow evaluating the requirement `fn() -> Foo {foo}: Sized`
--> $DIR/issue-53398-cyclic-types.rs:6:5
|
LL | foo
| ^^^
+ |
+ = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`issue_53398_cyclic_types`)
error: aborting due to previous error
--
2.36.1
From 74197dae66d15fdf202ce63481bc0b7d1a98b7cd Mon Sep 17 00:00:00 2001
From: Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de>
Date: Fri, 1 Jul 2022 13:19:27 +0000
Subject: [PATCH 4/7] Remove type flag based opaque type workaround
(cherry picked from commit 58c08cd0373eaabfe05d9e78efa417075ef019fb)
---
compiler/rustc_type_ir/src/lib.rs | 8 --
src/test/ui/impl-trait/auto-trait-leak.rs | 1 -
src/test/ui/impl-trait/auto-trait-leak.stderr | 112 +++---------------
.../auto-trait-leakage3.rs | 1 -
.../auto-trait-leakage3.stderr | 27 +----
.../type-alias-impl-trait/inference-cycle.rs | 1 -
.../inference-cycle.stderr | 27 +----
.../ui/type-alias-impl-trait/reveal_local.rs | 1 -
.../type-alias-impl-trait/reveal_local.stderr | 33 +-----
9 files changed, 30 insertions(+), 181 deletions(-)
diff --git a/compiler/rustc_type_ir/src/lib.rs b/compiler/rustc_type_ir/src/lib.rs
index c63e9c31d535..a46729f229e2 100644
--- a/compiler/rustc_type_ir/src/lib.rs
+++ b/compiler/rustc_type_ir/src/lib.rs
@@ -61,14 +61,6 @@ pub struct TypeFlags: u32 {
| TypeFlags::HAS_CT_INFER.bits
| TypeFlags::HAS_TY_PLACEHOLDER.bits
| TypeFlags::HAS_CT_PLACEHOLDER.bits
- // The `evaluate_obligation` query does not return further
- // obligations. If it evaluates an obligation with an opaque
- // type, that opaque type may get compared to another type,
- // constraining it. We would lose this information.
- // FIXME: differentiate between crate-local opaque types
- // and opaque types from other crates, as only opaque types
- // from the local crate can possibly be a local name
- | TypeFlags::HAS_TY_OPAQUE.bits
// We consider 'freshened' types and constants
// to depend on a particular fn.
// The freshening process throws away information,
diff --git a/src/test/ui/impl-trait/auto-trait-leak.rs b/src/test/ui/impl-trait/auto-trait-leak.rs
index d2452abab025..c2fbbf94fd66 100644
--- a/src/test/ui/impl-trait/auto-trait-leak.rs
+++ b/src/test/ui/impl-trait/auto-trait-leak.rs
@@ -11,7 +11,6 @@ fn main() {
// return type, which can't depend on the obligation.
fn cycle1() -> impl Clone {
//~^ ERROR cycle detected
- //~| ERROR cycle detected
send(cycle2().clone());
Rc::new(Cell::new(5))
diff --git a/src/test/ui/impl-trait/auto-trait-leak.stderr b/src/test/ui/impl-trait/auto-trait-leak.stderr
index 14db864f1c28..634ff14869eb 100644
--- a/src/test/ui/impl-trait/auto-trait-leak.stderr
+++ b/src/test/ui/impl-trait/auto-trait-leak.stderr
@@ -30,129 +30,47 @@ note: ...which requires building MIR for `cycle1`...
LL | fn cycle1() -> impl Clone {
| ^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires type-checking `cycle1`...
- --> $DIR/auto-trait-leak.rs:12:1
- |
-LL | fn cycle1() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires computing type of `cycle2::{opaque#0}`...
- --> $DIR/auto-trait-leak.rs:20:16
- |
-LL | fn cycle2() -> impl Clone {
- | ^^^^^^^^^^
-note: ...which requires borrow-checking `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
- |
-LL | fn cycle2() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires processing `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
- |
-LL | fn cycle2() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires processing MIR for `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
- |
-LL | fn cycle2() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires unsafety-checking `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
- |
-LL | fn cycle2() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires building MIR for `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
- |
-LL | fn cycle2() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires type-checking `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
- |
-LL | fn cycle2() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
- = note: ...which again requires computing type of `cycle1::{opaque#0}`, completing the cycle
-note: cycle used when checking item types in top-level module
- --> $DIR/auto-trait-leak.rs:1:1
- |
-LL | / use std::cell::Cell;
-LL | | use std::rc::Rc;
-LL | |
-LL | | fn send<T: Send>(_: T) {}
-... |
-LL | | Rc::new(String::from("foo"))
-LL | | }
- | |_^
-
-error[E0391]: cycle detected when computing type of `cycle1::{opaque#0}`
- --> $DIR/auto-trait-leak.rs:12:16
+ --> $DIR/auto-trait-leak.rs:14:5
|
-LL | fn cycle1() -> impl Clone {
- | ^^^^^^^^^^
- |
-note: ...which requires borrow-checking `cycle1`...
- --> $DIR/auto-trait-leak.rs:12:1
- |
-LL | fn cycle1() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires processing `cycle1`...
- --> $DIR/auto-trait-leak.rs:12:1
- |
-LL | fn cycle1() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires processing MIR for `cycle1`...
- --> $DIR/auto-trait-leak.rs:12:1
- |
-LL | fn cycle1() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires unsafety-checking `cycle1`...
- --> $DIR/auto-trait-leak.rs:12:1
- |
-LL | fn cycle1() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires building MIR for `cycle1`...
- --> $DIR/auto-trait-leak.rs:12:1
- |
-LL | fn cycle1() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires type-checking `cycle1`...
- --> $DIR/auto-trait-leak.rs:12:1
- |
-LL | fn cycle1() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | send(cycle2().clone());
+ | ^^^^
+ = note: ...which requires evaluating trait selection obligation `impl core::clone::Clone: core::marker::Send`...
note: ...which requires computing type of `cycle2::{opaque#0}`...
- --> $DIR/auto-trait-leak.rs:20:16
+ --> $DIR/auto-trait-leak.rs:19:16
|
LL | fn cycle2() -> impl Clone {
| ^^^^^^^^^^
note: ...which requires borrow-checking `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
+ --> $DIR/auto-trait-leak.rs:19:1
|
LL | fn cycle2() -> impl Clone {
| ^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires processing `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
+ --> $DIR/auto-trait-leak.rs:19:1
|
LL | fn cycle2() -> impl Clone {
| ^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires processing MIR for `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
+ --> $DIR/auto-trait-leak.rs:19:1
|
LL | fn cycle2() -> impl Clone {
| ^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires unsafety-checking `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
+ --> $DIR/auto-trait-leak.rs:19:1
|
LL | fn cycle2() -> impl Clone {
| ^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires building MIR for `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
+ --> $DIR/auto-trait-leak.rs:19:1
|
LL | fn cycle2() -> impl Clone {
| ^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires type-checking `cycle2`...
- --> $DIR/auto-trait-leak.rs:20:1
+ --> $DIR/auto-trait-leak.rs:20:5
|
-LL | fn cycle2() -> impl Clone {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | send(cycle1().clone());
+ | ^^^^
+ = note: ...which requires evaluating trait selection obligation `impl core::clone::Clone: core::marker::Send`...
= note: ...which again requires computing type of `cycle1::{opaque#0}`, completing the cycle
note: cycle used when checking item types in top-level module
--> $DIR/auto-trait-leak.rs:1:1
@@ -166,6 +84,6 @@ LL | | Rc::new(String::from("foo"))
LL | | }
| |_^
-error: aborting due to 2 previous errors
+error: aborting due to previous error
For more information about this error, try `rustc --explain E0391`.
diff --git a/src/test/ui/type-alias-impl-trait/auto-trait-leakage3.rs b/src/test/ui/type-alias-impl-trait/auto-trait-leakage3.rs
index b456b1445e78..5fb7a9473d3d 100644
--- a/src/test/ui/type-alias-impl-trait/auto-trait-leakage3.rs
+++ b/src/test/ui/type-alias-impl-trait/auto-trait-leakage3.rs
@@ -6,7 +6,6 @@
mod m {
type Foo = impl std::fmt::Debug;
//~^ ERROR: cycle detected when computing type of `m::Foo::{opaque#0}` [E0391]
- //~| ERROR: cycle detected when computing type of `m::Foo::{opaque#0}` [E0391]
pub fn foo() -> Foo {
22_u32
diff --git a/src/test/ui/type-alias-impl-trait/auto-trait-leakage3.stderr b/src/test/ui/type-alias-impl-trait/auto-trait-leakage3.stderr
index 4c44875b4a54..1e9a45aac79e 100644
--- a/src/test/ui/type-alias-impl-trait/auto-trait-leakage3.stderr
+++ b/src/test/ui/type-alias-impl-trait/auto-trait-leakage3.stderr
@@ -5,10 +5,11 @@ LL | type Foo = impl std::fmt::Debug;
| ^^^^^^^^^^^^^^^^^^^^
|
note: ...which requires type-checking `m::bar`...
- --> $DIR/auto-trait-leakage3.rs:15:5
+ --> $DIR/auto-trait-leakage3.rs:15:9
|
-LL | pub fn bar() {
- | ^^^^^^^^^^^^
+LL | is_send(foo());
+ | ^^^^^^^
+ = note: ...which requires evaluating trait selection obligation `m::Foo: core::marker::Send`...
= note: ...which again requires computing type of `m::Foo::{opaque#0}`, completing the cycle
note: cycle used when checking item types in module `m`
--> $DIR/auto-trait-leakage3.rs:6:1
@@ -16,24 +17,6 @@ note: cycle used when checking item types in module `m`
LL | mod m {
| ^^^^^
-error[E0391]: cycle detected when computing type of `m::Foo::{opaque#0}`
- --> $DIR/auto-trait-leakage3.rs:7:16
- |
-LL | type Foo = impl std::fmt::Debug;
- | ^^^^^^^^^^^^^^^^^^^^
- |
-note: ...which requires type-checking `m::bar`...
- --> $DIR/auto-trait-leakage3.rs:15:5
- |
-LL | pub fn bar() {
- | ^^^^^^^^^^^^
- = note: ...which again requires computing type of `m::Foo::{opaque#0}`, completing the cycle
-note: cycle used when checking item types in module `m`
- --> $DIR/auto-trait-leakage3.rs:6:1
- |
-LL | mod m {
- | ^^^^^
-
-error: aborting due to 2 previous errors
+error: aborting due to previous error
For more information about this error, try `rustc --explain E0391`.
diff --git a/src/test/ui/type-alias-impl-trait/inference-cycle.rs b/src/test/ui/type-alias-impl-trait/inference-cycle.rs
index 608572978a35..79caddf79132 100644
--- a/src/test/ui/type-alias-impl-trait/inference-cycle.rs
+++ b/src/test/ui/type-alias-impl-trait/inference-cycle.rs
@@ -4,7 +4,6 @@
mod m {
type Foo = impl std::fmt::Debug;
//~^ ERROR cycle detected
- //~| ERROR cycle detected
// Cycle: error today, but it'd be nice if it eventually worked
diff --git a/src/test/ui/type-alias-impl-trait/inference-cycle.stderr b/src/test/ui/type-alias-impl-trait/inference-cycle.stderr
index 3ed86fae8a18..b9d646b927a6 100644
--- a/src/test/ui/type-alias-impl-trait/inference-cycle.stderr
+++ b/src/test/ui/type-alias-impl-trait/inference-cycle.stderr
@@ -5,10 +5,11 @@ LL | type Foo = impl std::fmt::Debug;
| ^^^^^^^^^^^^^^^^^^^^
|
note: ...which requires type-checking `m::bar`...
- --> $DIR/inference-cycle.rs:15:5
+ --> $DIR/inference-cycle.rs:15:9
|
-LL | pub fn bar() {
- | ^^^^^^^^^^^^
+LL | is_send(foo()); // Today: error
+ | ^^^^^^^
+ = note: ...which requires evaluating trait selection obligation `m::Foo: core::marker::Send`...
= note: ...which again requires computing type of `m::Foo::{opaque#0}`, completing the cycle
note: cycle used when checking item types in module `m`
--> $DIR/inference-cycle.rs:4:1
@@ -16,24 +17,6 @@ note: cycle used when checking item types in module `m`
LL | mod m {
| ^^^^^
-error[E0391]: cycle detected when computing type of `m::Foo::{opaque#0}`
- --> $DIR/inference-cycle.rs:5:16
- |
-LL | type Foo = impl std::fmt::Debug;
- | ^^^^^^^^^^^^^^^^^^^^
- |
-note: ...which requires type-checking `m::bar`...
- --> $DIR/inference-cycle.rs:15:5
- |
-LL | pub fn bar() {
- | ^^^^^^^^^^^^
- = note: ...which again requires computing type of `m::Foo::{opaque#0}`, completing the cycle
-note: cycle used when checking item types in module `m`
- --> $DIR/inference-cycle.rs:4:1
- |
-LL | mod m {
- | ^^^^^
-
-error: aborting due to 2 previous errors
+error: aborting due to previous error
For more information about this error, try `rustc --explain E0391`.
diff --git a/src/test/ui/type-alias-impl-trait/reveal_local.rs b/src/test/ui/type-alias-impl-trait/reveal_local.rs
index 145186baa1fa..7ecb55353010 100644
--- a/src/test/ui/type-alias-impl-trait/reveal_local.rs
+++ b/src/test/ui/type-alias-impl-trait/reveal_local.rs
@@ -4,7 +4,6 @@
type Foo = impl Debug;
//~^ ERROR cycle detected
-//~| ERROR cycle detected
fn is_send<T: Send>() { }
diff --git a/src/test/ui/type-alias-impl-trait/reveal_local.stderr b/src/test/ui/type-alias-impl-trait/reveal_local.stderr
index 5d48dd5b2bf7..27fded333292 100644
--- a/src/test/ui/type-alias-impl-trait/reveal_local.stderr
+++ b/src/test/ui/type-alias-impl-trait/reveal_local.stderr
@@ -5,10 +5,11 @@ LL | type Foo = impl Debug;
| ^^^^^^^^^^
|
note: ...which requires type-checking `not_good`...
- --> $DIR/reveal_local.rs:11:1
+ --> $DIR/reveal_local.rs:13:5
|
-LL | fn not_good() {
- | ^^^^^^^^^^^^^
+LL | is_send::<Foo>();
+ | ^^^^^^^^^^^^^^
+ = note: ...which requires evaluating trait selection obligation `Foo: core::marker::Send`...
= note: ...which again requires computing type of `Foo::{opaque#0}`, completing the cycle
note: cycle used when checking item types in top-level module
--> $DIR/reveal_local.rs:1:1
@@ -22,30 +23,6 @@ LL | |
LL | | fn main() {}
| |____________^
-error[E0391]: cycle detected when computing type of `Foo::{opaque#0}`
- --> $DIR/reveal_local.rs:5:12
- |
-LL | type Foo = impl Debug;
- | ^^^^^^^^^^
- |
-note: ...which requires type-checking `not_gooder`...
- --> $DIR/reveal_local.rs:17:1
- |
-LL | fn not_gooder() {
- | ^^^^^^^^^^^^^^^
- = note: ...which again requires computing type of `Foo::{opaque#0}`, completing the cycle
-note: cycle used when checking item types in top-level module
- --> $DIR/reveal_local.rs:1:1
- |
-LL | / #![feature(type_alias_impl_trait)]
-LL | |
-LL | | use std::fmt::Debug;
-LL | |
-... |
-LL | |
-LL | | fn main() {}
- | |____________^
-
-error: aborting due to 2 previous errors
+error: aborting due to previous error
For more information about this error, try `rustc --explain E0391`.
--
2.36.1
From 60ea1625bffb09786a8ed9c1d4db52312d2675df Mon Sep 17 00:00:00 2001
From: Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de>
Date: Thu, 7 Jul 2022 08:10:50 +0000
Subject: [PATCH 5/7] not knowing about opaque types is worse than not knowing
about regions, make sure we don't accidentally mark something as
ok-modulo-regions if there are opaque types involved
(cherry picked from commit 0b863e0024df84ca6f58bad3a7226e8d0ca6c5f6)
---
compiler/rustc_middle/src/traits/select.rs | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/compiler/rustc_middle/src/traits/select.rs b/compiler/rustc_middle/src/traits/select.rs
index 025059fcbcfb..854dd215a37c 100644
--- a/compiler/rustc_middle/src/traits/select.rs
+++ b/compiler/rustc_middle/src/traits/select.rs
@@ -174,12 +174,12 @@ pub enum SelectionCandidate<'tcx> {
pub enum EvaluationResult {
/// Evaluation successful.
EvaluatedToOk,
+ /// Evaluation successful, but there were unevaluated region obligations.
+ EvaluatedToOkModuloRegions,
/// Evaluation successful, but need to rerun because opaque types got
/// hidden types assigned without it being known whether the opaque types
/// are within their defining scope
EvaluatedToOkModuloOpaqueTypes,
- /// Evaluation successful, but there were unevaluated region obligations.
- EvaluatedToOkModuloRegions,
/// Evaluation is known to be ambiguous -- it *might* hold for some
/// assignment of inference variables, but it might not.
///
--
2.36.1
From 735b8590e78ffe0b0e0083ea08d75d03b92c43fb Mon Sep 17 00:00:00 2001
From: Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de>
Date: Fri, 8 Jul 2022 13:59:44 +0000
Subject: [PATCH 6/7] Only register hidden types for opaque types from the
current crate, nothing else would work anyway.
(cherry picked from commit d6b93eb79352149bae0fd1efc0bb181947a9e6f1)
---
compiler/rustc_infer/src/infer/opaque_types.rs | 2 +-
compiler/rustc_middle/src/ty/mod.rs | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/compiler/rustc_infer/src/infer/opaque_types.rs b/compiler/rustc_infer/src/infer/opaque_types.rs
index 92c0ed84057a..3b9b6f7a2af9 100644
--- a/compiler/rustc_infer/src/infer/opaque_types.rs
+++ b/compiler/rustc_infer/src/infer/opaque_types.rs
@@ -99,7 +99,7 @@ pub fn handle_opaque_type(
}
let (a, b) = if a_is_expected { (a, b) } else { (b, a) };
let process = |a: Ty<'tcx>, b: Ty<'tcx>| match *a.kind() {
- ty::Opaque(def_id, substs) => {
+ ty::Opaque(def_id, substs) if def_id.is_local() => {
let origin = if self.defining_use_anchor.is_some() {
// Check that this is `impl Trait` type is
// declared by `parent_def_id` -- i.e., one whose
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 1c552591b117..a254979162e8 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -1065,6 +1065,7 @@ pub fn is_empty(&self) -> bool {
Lift
)]
pub struct OpaqueTypeKey<'tcx> {
+ // FIXME(oli-obk): make this a LocalDefId
pub def_id: DefId,
pub substs: SubstsRef<'tcx>,
}
--
2.36.1
From 1d4d0122ac5cbf7f4b948df36f7e315734c171b9 Mon Sep 17 00:00:00 2001
From: Mark Rousskov <mark.simulacrum@gmail.com>
Date: Sat, 9 Jul 2022 18:16:53 -0400
Subject: [PATCH 7/7] Fix tests after beta backport
(cherry picked from commit 5a81254ef29b968f15f5296568c4b985657e8c49)
---
src/test/ui/type-alias-impl-trait/issue-98604.stderr | 2 +-
src/test/ui/type-alias-impl-trait/issue-98608.stderr | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/test/ui/type-alias-impl-trait/issue-98604.stderr b/src/test/ui/type-alias-impl-trait/issue-98604.stderr
index f04d1b4d7877..ad3982760c39 100644
--- a/src/test/ui/type-alias-impl-trait/issue-98604.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-98604.stderr
@@ -11,7 +11,7 @@ LL | async fn test() {}
| ^ checked the `Output` of this `async fn`, found opaque type
= note: expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
found opaque type `impl Future<Output = ()>`
- = note: required for the cast from `fn() -> impl Future<Output = ()> {test}` to the object type `dyn Fn() -> Pin<Box<(dyn Future<Output = ()> + 'static)>>`
+ = note: required for the cast to the object type `dyn Fn() -> Pin<Box<(dyn Future<Output = ()> + 'static)>>`
error: aborting due to previous error
diff --git a/src/test/ui/type-alias-impl-trait/issue-98608.stderr b/src/test/ui/type-alias-impl-trait/issue-98608.stderr
index 8f3ec7d9d161..6773b01112d8 100644
--- a/src/test/ui/type-alias-impl-trait/issue-98608.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-98608.stderr
@@ -9,7 +9,7 @@ LL | let b: Box<dyn Fn() -> Box<u8>> = Box::new(hi);
|
= note: expected struct `Box<u8>`
found opaque type `impl Sized`
- = note: required for the cast from `fn() -> impl Sized {hi}` to the object type `dyn Fn() -> Box<u8>`
+ = note: required for the cast to the object type `dyn Fn() -> Box<u8>`
error: aborting due to previous error
--
2.36.1