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traits diagnostics: Don't print closure/generator upvar_tys tuple

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Co-authored-by: Roxane Fruytier <roxane.fruytier@hotmail.com>
This commit is contained in:
Aman Arora 2020-10-08 00:28:53 -04:00
parent 08d1ab0bf1
commit 3c46fd67f8
11 changed files with 23 additions and 13 deletions
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24
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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@ -1922,7 +1922,29 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
return;
}
err.note(&format!("required because it appears within the type `{}`", ty));
// If the obligation for a tuple is set directly by a Generator or Closure,
// then the tuple must be the one containing capture types.
let is_upvar_tys_infer_tuple = if !matches!(ty.kind(), ty::Tuple(..)) {
false
} else {
if let ObligationCauseCode::BuiltinDerivedObligation(ref data) =
*data.parent_code
{
let parent_trait_ref =
self.resolve_vars_if_possible(&data.parent_trait_ref);
let ty = parent_trait_ref.skip_binder().self_ty();
matches!(ty.kind(), ty::Generator(..))
|| matches!(ty.kind(), ty::Closure(..))
} else {
false
}
};
// Don't print the tuple of capture types
if !is_upvar_tys_infer_tuple {
err.note(&format!("required because it appears within the type `{}`", ty));
}
obligated_types.push(ty);
let parent_predicate = parent_trait_ref.without_const().to_predicate(tcx);

1
src/test/ui/async-await/issue-68112.stderr
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@ -41,7 +41,6 @@ LL | require_send(send_fut);
|
= help: the trait `Sync` is not implemented for `RefCell<i32>`
= note: required because of the requirements on the impl of `Send` for `Arc<RefCell<i32>>`
= note: required because it appears within the type `(Arc<RefCell<i32>>,)`
= note: required because it appears within the type `[static generator@$DIR/issue-68112.rs:47:31: 47:36 {}]`
= note: required because it appears within the type `from_generator::GenFuture<[static generator@$DIR/issue-68112.rs:47:31: 47:36 {}]>`
= note: required because it appears within the type `impl Future`

2
src/test/ui/closures/closure-move-sync.stderr
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@ -11,7 +11,6 @@ LL | F: Send + 'static,
|
= help: the trait `Sync` is not implemented for `std::sync::mpsc::Receiver<()>`
= note: required because of the requirements on the impl of `Send` for `&std::sync::mpsc::Receiver<()>`
= note: required because it appears within the type `(&std::sync::mpsc::Receiver<()>,)`
= note: required because it appears within the type `[closure@$DIR/closure-move-sync.rs:6:27: 9:6]`
error[E0277]: `Sender<()>` cannot be shared between threads safely
@ -27,7 +26,6 @@ LL | F: Send + 'static,
|
= help: the trait `Sync` is not implemented for `Sender<()>`
= note: required because of the requirements on the impl of `Send` for `&Sender<()>`
= note: required because it appears within the type `(&Sender<()>,)`
= note: required because it appears within the type `[closure@$DIR/closure-move-sync.rs:18:19: 18:42]`
error: aborting due to 2 previous errors

1
src/test/ui/generator/issue-68112.stderr
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@ -29,7 +29,6 @@ LL | require_send(send_gen);
|
= help: the trait `Sync` is not implemented for `RefCell<i32>`
= note: required because of the requirements on the impl of `Send` for `Arc<RefCell<i32>>`
= note: required because it appears within the type `(Arc<RefCell<i32>>,)`
= note: required because it appears within the type `[generator@$DIR/issue-68112.rs:38:5: 41:6 {()}]`
= note: required because it appears within the type `impl Generator`
= note: required because it appears within the type `impl Generator`

1
src/test/ui/generator/not-send-sync.stderr
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@ -9,7 +9,6 @@ LL | assert_send(|| {
|
= help: the trait `Sync` is not implemented for `Cell<i32>`
= note: required because of the requirements on the impl of `Send` for `&Cell<i32>`
= note: required because it appears within the type `(&Cell<i32>,)`
= note: required because it appears within the type `[generator@$DIR/not-send-sync.rs:16:17: 20:6 _]`
error: generator cannot be shared between threads safely

1
src/test/ui/generator/print/generator-print-verbose-1.stderr
View File

@ -29,7 +29,6 @@ LL | require_send(send_gen);
|
= help: the trait `Sync` is not implemented for `RefCell<i32>`
= note: required because of the requirements on the impl of `Send` for `Arc<RefCell<i32>>`
= note: required because it appears within the type `(Arc<RefCell<i32>>,)`
= note: required because it appears within the type `[make_gen2<Arc<RefCell<i32>>>::{closure#0} upvar_tys=(Arc<RefCell<i32>>) {()}]`
= note: required because it appears within the type `Opaque(DefId(0:29 ~ generator_print_verbose_1[317d]::make_gen2::{opaque#0}), [std::sync::Arc<std::cell::RefCell<i32>>])`
= note: required because it appears within the type `Opaque(DefId(0:32 ~ generator_print_verbose_1[317d]::make_non_send_generator2::{opaque#0}), [])`

1
src/test/ui/generator/print/generator-print-verbose-2.stderr
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@ -9,7 +9,6 @@ LL | assert_send(|| {
|
= help: the trait `Sync` is not implemented for `Cell<i32>`
= note: required because of the requirements on the impl of `Send` for `&'_#3r Cell<i32>`
= note: required because it appears within the type `(&'_#3r Cell<i32>,)`
= note: required because it appears within the type `[main::{closure#1} upvar_tys=(&'_#3r Cell<i32>) _#17t]`
error: generator cannot be shared between threads safely

2
src/test/ui/impl-trait/auto-trait-leak2.stderr
View File

@ -11,7 +11,6 @@ LL | send(before());
| ^^^^ `Rc<Cell<i32>>` cannot be sent between threads safely
|
= help: within `impl Fn<(i32,)>`, the trait `Send` is not implemented for `Rc<Cell<i32>>`
= note: required because it appears within the type `(Rc<Cell<i32>>,)`
= note: required because it appears within the type `[closure@$DIR/auto-trait-leak2.rs:7:5: 7:22]`
= note: required because it appears within the type `impl Fn<(i32,)>`
@ -28,7 +27,6 @@ LL | fn after() -> impl Fn(i32) {
| ------------ within this `impl Fn<(i32,)>`
|
= help: within `impl Fn<(i32,)>`, the trait `Send` is not implemented for `Rc<Cell<i32>>`
= note: required because it appears within the type `(Rc<Cell<i32>>,)`
= note: required because it appears within the type `[closure@$DIR/auto-trait-leak2.rs:24:5: 24:22]`
= note: required because it appears within the type `impl Fn<(i32,)>`

1
src/test/ui/interior-mutability/interior-mutability.stderr
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@ -12,7 +12,6 @@ LL | pub fn catch_unwind<F: FnOnce() -> R + UnwindSafe, R>(f: F) -> Result<R> {
= help: within `Cell<i32>`, the trait `RefUnwindSafe` is not implemented for `UnsafeCell<i32>`
= note: required because it appears within the type `Cell<i32>`
= note: required because of the requirements on the impl of `UnwindSafe` for `&Cell<i32>`
= note: required because it appears within the type `(&Cell<i32>,)`
= note: required because it appears within the type `[closure@$DIR/interior-mutability.rs:5:18: 5:35]`
error: aborting due to previous error

1
src/test/ui/kindck/kindck-nonsendable-1.stderr
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@ -10,7 +10,6 @@ LL | bar(move|| foo(x));
| `Rc<usize>` cannot be sent between threads safely
|
= help: within `[closure@$DIR/kindck-nonsendable-1.rs:9:9: 9:22]`, the trait `Send` is not implemented for `Rc<usize>`
= note: required because it appears within the type `(Rc<usize>,)`
= note: required because it appears within the type `[closure@$DIR/kindck-nonsendable-1.rs:9:9: 9:22]`
error: aborting due to previous error

1
src/test/ui/no-send-res-ports.stderr
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@ -19,7 +19,6 @@ LL | F: Send + 'static,
= help: within `[closure@$DIR/no-send-res-ports.rs:25:19: 29:6]`, the trait `Send` is not implemented for `Rc<()>`
= note: required because it appears within the type `Port<()>`
= note: required because it appears within the type `Foo`
= note: required because it appears within the type `(Foo,)`
= note: required because it appears within the type `[closure@$DIR/no-send-res-ports.rs:25:19: 29:6]`
error: aborting due to previous error