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Auto merge of #95250 - matthiaskrgr:rollup-ma4zl69, r=matthiaskrgr

Browse Source 
Rollup of 5 pull requests

Successful merges:

 - #94249 (Better errors when a Copy impl on a Struct is not self-consistent)
 - #95069 (Fix auto traits in rustdoc)
 - #95221 (interpret/memory: simplify check_and_deref_ptr)
 - #95225 (remove `[async output]` from `impl Future` pretty-printing)
 - #95238 (Stop emitting E0026 for struct enums with underscores)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
This commit is contained in:
bors 2022-03-23 23:02:17 +00:00
commit 37b55c8a0c
34 changed files with 203 additions and 66 deletions
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20
compiler/rustc_const_eval/src/interpret/memory.rs
View File

@ -427,22 +427,12 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> Memory<'mir, 'tcx, M> {
}
}
// Extract from the pointer an `Option<AllocId>` and an offset, which is relative to the
// allocation or (if that is `None`) an absolute address.
let ptr_or_addr = if size.bytes() == 0 {
// Let's see what we can do, but don't throw errors if there's nothing there.
self.ptr_try_get_alloc(ptr)
} else {
// A "real" access, we insist on getting an `AllocId`.
Ok(self.ptr_get_alloc(ptr)?)
};
Ok(match ptr_or_addr {
Ok(match self.ptr_try_get_alloc(ptr) {
Err(addr) => {
// No memory is actually being accessed.
debug_assert!(size.bytes() == 0);
// Must be non-null.
if addr == 0 {
throw_ub!(DanglingIntPointer(0, msg))
// We couldn't get a proper allocation. This is only okay if the access size is 0,
// and the address is not null.
if size.bytes() > 0 || addr == 0 {
throw_ub!(DanglingIntPointer(addr, msg));
}
// Must be aligned.
if let Some(align) = align {

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

@ -41,6 +41,7 @@
#![feature(new_uninit)]
#![feature(nll)]
#![feature(once_cell)]
#![feature(let_chains)]
#![feature(let_else)]
#![feature(min_specialization)]
#![feature(trusted_len)]

36
compiler/rustc_middle/src/ty/print/pretty.rs
View File

@ -896,44 +896,48 @@ pub trait PrettyPrinter<'tcx>:
);
if !generics.is_empty() || !assoc_items.is_empty() {
p!("<");
let mut first = true;
for ty in generics {
if !first {
if first {
p!("<");
first = false;
} else {
p!(", ");
}
p!(print(trait_ref.rebind(*ty)));
first = false;
}
for (assoc_item_def_id, term) in assoc_items {
if !first {
// Skip printing `<[generator@] as Generator<_>>::Return` from async blocks
if let Some(ty) = term.skip_binder().ty() &&
let ty::Projection(ty::ProjectionTy { item_def_id, .. }) = ty.kind() &&
Some(*item_def_id) == self.tcx().lang_items().generator_return() {
continue;
}
if first {
p!("<");
first = false;
} else {
p!(", ");
}
p!(write("{} = ", self.tcx().associated_item(assoc_item_def_id).name));
match term.skip_binder() {
Term::Ty(ty) => {
// Skip printing `<[generator@] as Generator<_>>::Return` from async blocks
if matches!(
ty.kind(), ty::Projection(ty::ProjectionTy { item_def_id, .. })
if Some(*item_def_id) == self.tcx().lang_items().generator_return()
) {
p!("[async output]")
} else {
p!(print(ty))
}
p!(print(ty))
}
Term::Const(c) => {
p!(print(c));
}
};
first = false;
}
p!(">");
if !first {
p!(">");
}
}
first = false;

4
compiler/rustc_trait_selection/src/traits/misc.rs
View File

@ -11,7 +11,7 @@ use crate::traits::error_reporting::InferCtxtExt;
#[derive(Clone)]
pub enum CopyImplementationError<'tcx> {
InfrigingFields(Vec<&'tcx ty::FieldDef>),
InfrigingFields(Vec<(&'tcx ty::FieldDef, Ty<'tcx>)>),
NotAnAdt,
HasDestructor,
}
@ -67,7 +67,7 @@ pub fn can_type_implement_copy<'tcx>(
match traits::fully_normalize(&infcx, ctx, cause, param_env, ty) {
Ok(ty) => {
if !infcx.type_is_copy_modulo_regions(param_env, ty, span) {
infringing.push(field);
infringing.push((field, ty));
}
}
Err(errors) => {

4
compiler/rustc_trait_selection/src/traits/select/mod.rs
View File

@ -1270,7 +1270,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
// the master cache. Since coherence executes pretty quickly,
// it's not worth going to more trouble to increase the
// hit-rate, I don't think.
if self.intercrate {
if self.intercrate || self.allow_negative_impls {
return false;
}
@ -1287,7 +1287,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
// mode, so don't do any caching. In particular, we might
// re-use the same `InferCtxt` with both an intercrate
// and non-intercrate `SelectionContext`
if self.intercrate {
if self.intercrate || self.allow_negative_impls {
return None;
}
let tcx = self.tcx();

6
compiler/rustc_typeck/src/check/pat.rs
View File

@ -17,7 +17,7 @@ use rustc_session::lint::builtin::NON_EXHAUSTIVE_OMITTED_PATTERNS;
use rustc_span::hygiene::DesugaringKind;
use rustc_span::lev_distance::find_best_match_for_name;
use rustc_span::source_map::{Span, Spanned};
use rustc_span::symbol::{sym, Ident};
use rustc_span::symbol::{kw, sym, Ident};
use rustc_span::{BytePos, MultiSpan, DUMMY_SP};
use rustc_trait_selection::autoderef::Autoderef;
use rustc_trait_selection::traits::{ObligationCause, Pattern};
@ -1275,7 +1275,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
.filter(|(_, ident)| !used_fields.contains_key(ident))
.collect::<Vec<_>>();
let inexistent_fields_err = if !(inexistent_fields.is_empty() || variant.is_recovered()) {
let inexistent_fields_err = if !(inexistent_fields.is_empty() || variant.is_recovered())
&& !inexistent_fields.iter().any(|field| field.name == kw::Underscore)
{
Some(self.error_inexistent_fields(
adt.variant_descr(),
&inexistent_fields,

36
compiler/rustc_typeck/src/coherence/builtin.rs
View File

@ -91,8 +91,40 @@ fn visit_implementation_of_copy(tcx: TyCtxt<'_>, impl_did: LocalDefId) {
E0204,
"the trait `Copy` may not be implemented for this type"
);
for span in fields.iter().map(|f| tcx.def_span(f.did)) {
err.span_label(span, "this field does not implement `Copy`");
for (field, ty) in fields {
let field_span = tcx.def_span(field.did);
err.span_label(field_span, "this field does not implement `Copy`");
// Spin up a new FulfillmentContext, so we can get the _precise_ reason
// why this field does not implement Copy. This is useful because sometimes
// it is not immediately clear why Copy is not implemented for a field, since
// all we point at is the field itself.
tcx.infer_ctxt().enter(|infcx| {
let mut fulfill_cx = traits::FulfillmentContext::new_ignoring_regions();
fulfill_cx.register_bound(
&infcx,
param_env,
ty,
tcx.lang_items().copy_trait().unwrap(),
traits::ObligationCause::dummy_with_span(field_span),
);
for error in fulfill_cx.select_all_or_error(&infcx) {
let error_predicate = error.obligation.predicate;
// Only note if it's not the root obligation, otherwise it's trivial and
// should be self-explanatory (i.e. a field literally doesn't implement Copy).
// FIXME: This error could be more descriptive, especially if the error_predicate
// contains a foreign type or if it's a deeply nested type...
if error_predicate != error.root_obligation.predicate {
err.span_note(
error.obligation.cause.span,
&format!(
"the `Copy` impl for `{}` requires that `{}`",
ty, error_predicate
),
);
}
}
});
}
err.emit();
}

8
src/test/rustdoc/auto-trait-not-send.rs Normal file
View File

@ -0,0 +1,8 @@
#![crate_name = "foo"]
// @has 'foo/struct.Foo.html'
// @has - '//*[@id="impl-Send"]' 'impl !Send for Foo'
// @has - '//*[@id="impl-Sync"]' 'impl !Sync for Foo'
pub struct Foo(*const i8);
pub trait Whatever: Send {}
impl<T: Send + ?Sized> Whatever for T {}

2
src/test/ui/async-await/async-block-control-flow-static-semantics.rs
View File

@ -24,7 +24,7 @@ async fn return_targets_async_block_not_async_fn() -> u8 {
return 0u8;
};
let _: &dyn Future<Output = ()> = &block;
//~^ ERROR type mismatch resolving `<impl Future<Output = [async output]> as Future>::Output == ()`
//~^ ERROR type mismatch resolving `<impl Future as Future>::Output == ()`
}
fn no_break_in_async_block() {

4
src/test/ui/async-await/async-block-control-flow-static-semantics.stderr
View File

@ -31,7 +31,7 @@ LL | |
LL | | }
| |_^ expected `u8`, found `()`
error[E0271]: type mismatch resolving `<impl Future<Output = [async output]> as Future>::Output == ()`
error[E0271]: type mismatch resolving `<impl Future as Future>::Output == ()`
--> $DIR/async-block-control-flow-static-semantics.rs:26:39
|
LL | let _: &dyn Future<Output = ()> = &block;
@ -47,7 +47,7 @@ LL | fn return_targets_async_block_not_fn() -> u8 {
| |
| implicitly returns `()` as its body has no tail or `return` expression
error[E0271]: type mismatch resolving `<impl Future<Output = [async output]> as Future>::Output == ()`
error[E0271]: type mismatch resolving `<impl Future as Future>::Output == ()`
--> $DIR/async-block-control-flow-static-semantics.rs:17:39
|
LL | let _: &dyn Future<Output = ()> = &block;

4
src/test/ui/async-await/generator-desc.stderr
View File

@ -46,8 +46,8 @@ LL | pub const fn from_generator<T>(gen: T) -> impl Future<Output = T::Return>
| the expected opaque type
| the found opaque type
|
= note: expected opaque type `impl Future<Output = [async output]>` (`async` closure body)
found opaque type `impl Future<Output = [async output]>` (`async` closure body)
= note: expected opaque type `impl Future` (`async` closure body)
found opaque type `impl Future` (`async` closure body)
error: aborting due to 3 previous errors

2
src/test/ui/async-await/issue-67252-unnamed-future.stderr
View File

@ -4,7 +4,7 @@ error: future cannot be sent between threads safely
LL | spawn(async {
| ^^^^^ future created by async block is not `Send`
|
= help: within `impl Future<Output = [async output]>`, the trait `Send` is not implemented for `*mut ()`
= help: within `impl Future`, the trait `Send` is not implemented for `*mut ()`
note: future is not `Send` as this value is used across an await
--> $DIR/issue-67252-unnamed-future.rs:20:16
|

4
src/test/ui/async-await/issue-68112.stderr
View File

@ -44,13 +44,13 @@ LL | require_send(send_fut);
= note: required because of the requirements on the impl of `Send` for `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<Output = [async output]>`
= note: required because it appears within the type `impl Future`
= note: required because it appears within the type `impl Future<Output = Arc<RefCell<i32>>>`
= note: required because it appears within the type `impl Future<Output = Arc<RefCell<i32>>>`
= note: required because it appears within the type `{ResumeTy, impl Future<Output = Arc<RefCell<i32>>>, (), i32, Ready<i32>}`
= note: required because it appears within the type `[static generator@$DIR/issue-68112.rs:55:26: 59:6]`
= note: required because it appears within the type `from_generator::GenFuture<[static generator@$DIR/issue-68112.rs:55:26: 59:6]>`
= note: required because it appears within the type `impl Future<Output = [async output]>`
= note: required because it appears within the type `impl Future`
note: required by a bound in `require_send`
--> $DIR/issue-68112.rs:11:25
|

2
src/test/ui/async-await/issues/issue-65436-raw-ptr-not-send.stderr
View File

@ -4,7 +4,7 @@ error: future cannot be sent between threads safely
LL | assert_send(async {
| ^^^^^^^^^^^ future created by async block is not `Send`
|
= help: within `impl Future<Output = [async output]>`, the trait `Send` is not implemented for `*const u8`
= help: within `impl Future`, the trait `Send` is not implemented for `*const u8`
note: future is not `Send` as this value is used across an await
--> $DIR/issue-65436-raw-ptr-not-send.rs:14:35
|

2
src/test/ui/async-await/partial-drop-partial-reinit.stderr
View File

@ -14,7 +14,7 @@ LL | async fn foo() {
= note: required because it appears within the type `{ResumeTy, (NotSend,), impl Future<Output = ()>, ()}`
= note: required because it appears within the type `[static generator@$DIR/partial-drop-partial-reinit.rs:22:16: 27:2]`
= note: required because it appears within the type `from_generator::GenFuture<[static generator@$DIR/partial-drop-partial-reinit.rs:22:16: 27:2]>`
= note: required because it appears within the type `impl Future<Output = [async output]>`
= note: required because it appears within the type `impl Future`
= note: required because it appears within the type `impl Future<Output = ()>`
note: required by a bound in `gimme_send`
--> $DIR/partial-drop-partial-reinit.rs:10:18

2
src/test/ui/chalkify/bugs/async.stderr
View File

@ -28,7 +28,7 @@ note: required by a bound in `from_generator`
LL | T: Generator<ResumeTy, Yield = ()>,
| ^^^^^^^^^^ required by this bound in `from_generator`
error[E0280]: the requirement `<impl Future<Output = [async output]> as Future>::Output == u32` is not satisfied
error[E0280]: the requirement `<impl Future as Future>::Output == u32` is not satisfied
--> $DIR/async.rs:7:25
|
LL | async fn foo(x: u32) -> u32 {

40
src/test/ui/coherence/deep-bad-copy-reason.rs Normal file
View File

@ -0,0 +1,40 @@
#![feature(extern_types)]
extern "Rust" {
type OpaqueListContents;
}
pub struct ListS<T> {
len: usize,
data: [T; 0],
opaque: OpaqueListContents,
}
pub struct Interned<'a, T>(&'a T);
impl<'a, T> Clone for Interned<'a, T> {
fn clone(&self) -> Self {
*self
}
}
impl<'a, T> Copy for Interned<'a, T> {}
pub struct List<'tcx, T>(Interned<'tcx, ListS<T>>);
//~^ NOTE this field does not implement `Copy`
//~| NOTE the `Copy` impl for `Interned<'tcx, ListS<T>>` requires that `OpaqueListContents: Sized`
impl<'tcx, T> Clone for List<'tcx, T> {
fn clone(&self) -> Self {
*self
}
}
impl<'tcx, T> Copy for List<'tcx, T> {}
//~^ ERROR the trait `Copy` may not be implemented for this type
fn assert_is_copy<T: Copy>() {}
fn main() {
assert_is_copy::<List<'static, ()>>();
}

18
src/test/ui/coherence/deep-bad-copy-reason.stderr Normal file
View File

@ -0,0 +1,18 @@
error[E0204]: the trait `Copy` may not be implemented for this type
--> $DIR/deep-bad-copy-reason.rs:33:15
|
LL | pub struct List<'tcx, T>(Interned<'tcx, ListS<T>>);
| ------------------------ this field does not implement `Copy`
...
LL | impl<'tcx, T> Copy for List<'tcx, T> {}
| ^^^^
|
note: the `Copy` impl for `Interned<'tcx, ListS<T>>` requires that `OpaqueListContents: Sized`
--> $DIR/deep-bad-copy-reason.rs:23:26
|
LL | pub struct List<'tcx, T>(Interned<'tcx, ListS<T>>);
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0204`.

2
src/test/ui/consts/const-deref-ptr.stderr
View File

@ -2,7 +2,7 @@ error[E0080]: could not evaluate static initializer
--> $DIR/const-deref-ptr.rs:4:29
|
LL | static C: u64 = unsafe {*(0xdeadbeef as *const u64)};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ 0xdeadbeef is not a valid pointer
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ dereferencing pointer failed: 0xdeadbeef is not a valid pointer
error: aborting due to previous error

4
src/test/ui/consts/const-eval/const_raw_ptr_ops2.stderr
View File

@ -2,13 +2,13 @@ error[E0080]: evaluation of constant value failed
--> $DIR/const_raw_ptr_ops2.rs:7:26
|
LL | const Z2: i32 = unsafe { *(42 as *const i32) };
| ^^^^^^^^^^^^^^^^^^^ 0x2a is not a valid pointer
| ^^^^^^^^^^^^^^^^^^^ dereferencing pointer failed: 0x2a is not a valid pointer
error[E0080]: evaluation of constant value failed
--> $DIR/const_raw_ptr_ops2.rs:9:26
|
LL | const Z3: i32 = unsafe { *(44 as *const i32) };
| ^^^^^^^^^^^^^^^^^^^ 0x2c is not a valid pointer
| ^^^^^^^^^^^^^^^^^^^ dereferencing pointer failed: 0x2c is not a valid pointer
error: aborting due to 2 previous errors

2
src/test/ui/consts/const-eval/ub-wide-ptr.32bit.stderr
View File

@ -296,7 +296,7 @@ error[E0080]: could not evaluate static initializer
--> $DIR/ub-wide-ptr.rs:135:5
|
LL | mem::transmute::<_, &dyn Trait>((&92u8, 0usize))
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ null pointer is not a valid pointer for this operation
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is not a valid pointer
error[E0080]: could not evaluate static initializer
--> $DIR/ub-wide-ptr.rs:139:5

2
src/test/ui/consts/const-eval/ub-wide-ptr.64bit.stderr
View File

@ -296,7 +296,7 @@ error[E0080]: could not evaluate static initializer
--> $DIR/ub-wide-ptr.rs:135:5
|
LL | mem::transmute::<_, &dyn Trait>((&92u8, 0usize))
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ null pointer is not a valid pointer for this operation
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is not a valid pointer
error[E0080]: could not evaluate static initializer
--> $DIR/ub-wide-ptr.rs:139:5

2
src/test/ui/consts/const-mut-refs/mut_ref_in_final_dynamic_check.stderr
View File

@ -4,7 +4,7 @@ error[E0080]: evaluation of constant value failed
LL | Some(&mut *(42 as *mut i32))
| ^^^^^^^^^^^^^^^^^^^^^^
| |
| 0x2a is not a valid pointer
| dereferencing pointer failed: 0x2a is not a valid pointer
| inside `helper` at $DIR/mut_ref_in_final_dynamic_check.rs:13:10
...
LL | const A: Option<&mut i32> = helper();

4
src/test/ui/consts/offset_ub.stderr
View File

@ -130,7 +130,7 @@ error[E0080]: evaluation of constant value failed
LL | unsafe { intrinsics::offset(self, count) as *mut T }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| 0x1 is not a valid pointer
| pointer arithmetic failed: 0x1 is not a valid pointer
| inside `ptr::mut_ptr::<impl *mut u8>::offset` at $SRC_DIR/core/src/ptr/mut_ptr.rs:LL:COL
|
::: $DIR/offset_ub.rs:19:42
@ -158,7 +158,7 @@ error[E0080]: evaluation of constant value failed
LL | unsafe { intrinsics::offset(self, count) }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| 0x7f..f is not a valid pointer
| pointer arithmetic failed: 0x7f..f is not a valid pointer
| inside `ptr::const_ptr::<impl *const u8>::offset` at $SRC_DIR/core/src/ptr/const_ptr.rs:LL:COL
|
::: $DIR/offset_ub.rs:25:47

2
src/test/ui/error-codes/E0396-fixed.stderr
View File

@ -2,7 +2,7 @@ error[E0080]: evaluation of constant value failed
--> $DIR/E0396-fixed.rs:5:28
|
LL | const VALUE: u8 = unsafe { *REG_ADDR };
| ^^^^^^^^^ 0x5f3759df is not a valid pointer
| ^^^^^^^^^ dereferencing pointer failed: 0x5f3759df is not a valid pointer
error: aborting due to previous error

2
src/test/ui/generic-associated-types/bugs/issue-89008.stderr
View File

@ -1,4 +1,4 @@
error[E0271]: type mismatch resolving `<impl Future<Output = [async output]> as Future>::Output == impl Stream<Item = Repr>`
error[E0271]: type mismatch resolving `<impl Future as Future>::Output == impl Stream<Item = Repr>`
--> $DIR/issue-89008.rs:39:43
|
LL | type LineStream<'a, Repr> = impl Stream<Item = Repr>;

2
src/test/ui/impl-trait/issue-55872-2.rs
View File

@ -12,7 +12,7 @@ impl<S> Bar for S {
type E = impl std::marker::Copy;
fn foo<T>() -> Self::E {
//~^ ERROR type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
//~| ERROR the trait bound `impl Future<Output = [async output]>: Copy` is not satisfied
//~| ERROR the trait bound `impl Future: Copy` is not satisfied
async {}
}
}

4
src/test/ui/impl-trait/issue-55872-2.stderr
View File

@ -1,8 +1,8 @@
error[E0277]: the trait bound `impl Future<Output = [async output]>: Copy` is not satisfied
error[E0277]: the trait bound `impl Future: Copy` is not satisfied
--> $DIR/issue-55872-2.rs:13:20
|
LL | fn foo<T>() -> Self::E {
| ^^^^^^^ the trait `Copy` is not implemented for `impl Future<Output = [async output]>`
| ^^^^^^^ the trait `Copy` is not implemented for `impl Future`
error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
--> $DIR/issue-55872-2.rs:13:28

2
src/test/ui/impl-trait/issues/issue-78722.stderr
View File

@ -15,7 +15,7 @@ LL | pub const fn from_generator<T>(gen: T) -> impl Future<Output = T::Return>
| ------------------------------- the found opaque type
|
= note: expected opaque type `impl Future<Output = u8>`
found opaque type `impl Future<Output = [async output]>`
found opaque type `impl Future`
= note: distinct uses of `impl Trait` result in different opaque types
error: aborting due to previous error

2
src/test/ui/pattern/non-structural-match-types.stderr
View File

@ -4,7 +4,7 @@ error: `[closure@$DIR/non-structural-match-types.rs:9:17: 9:22]` cannot be used
LL | const { || {} } => {},
| ^^^^^^^^^^^^^^^
error: `impl Future<Output = [async output]>` cannot be used in patterns
error: `impl Future` cannot be used in patterns
--> $DIR/non-structural-match-types.rs:12:9
|
LL | const { async {} } => {},

12
src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.rs Normal file
View File

@ -0,0 +1,12 @@
enum Foo {
Bar { bar: bool },
Other,
}
fn main() {
let foo = Some(Foo::Other);
if let Some(Foo::Bar {_}) = foo {}
//~^ ERROR expected identifier, found reserved identifier `_`
//~| ERROR pattern does not mention field `bar` [E0027]
}

24
src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.stderr Normal file
View File

@ -0,0 +1,24 @@
error: expected identifier, found reserved identifier `_`
--> $DIR/struct-enum-ignoring-field-with-underscore.rs:9:27
|
LL | if let Some(Foo::Bar {_}) = foo {}
| ^ expected identifier, found reserved identifier
error[E0027]: pattern does not mention field `bar`
--> $DIR/struct-enum-ignoring-field-with-underscore.rs:9:17
|
LL | if let Some(Foo::Bar {_}) = foo {}
| ^^^^^^^^^^^^ missing field `bar`
|
help: include the missing field in the pattern
|
LL | if let Some(Foo::Bar {_, bar }) = foo {}
| ~~~~~~~
help: if you don't care about this missing field, you can explicitly ignore it
|
LL | if let Some(Foo::Bar {_, .. }) = foo {}
| ~~~~~~
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0027`.

2
src/test/ui/suggestions/expected-boxed-future-isnt-pinned.stderr
View File

@ -81,7 +81,7 @@ LL | pub const fn from_generator<T>(gen: T) -> impl Future<Output = T::Return>
| ------------------------------- the found opaque type
|
= note: expected struct `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>`
found opaque type `impl Future<Output = [async output]>`
found opaque type `impl Future`
help: you need to pin and box this expression
|
LL ~ Box::pin(async {

6
src/test/ui/union/union-copy.stderr
View File

@ -6,6 +6,12 @@ LL | a: std::mem::ManuallyDrop<String>
...
LL | impl Copy for W {}
| ^^^^
|
note: the `Copy` impl for `ManuallyDrop<String>` requires that `String: Copy`
--> $DIR/union-copy.rs:8:5
|
LL | a: std::mem::ManuallyDrop<String>
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error