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837856d1
编写于
3月 11, 2019
作者:
F
Felix S. Klock II
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差异文件
Test illustrating that the nested_impl_trait lint should only catch shallow cases.
上级
c9930335
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2
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src/test/ui/impl-trait/issue-57979-deeply-nested-impl-trait-in-assoc-proj.rs
...ait/issue-57979-deeply-nested-impl-trait-in-assoc-proj.rs
+42
-0
src/test/ui/impl-trait/issue-57979-deeply-nested-impl-trait-in-assoc-proj.stderr
...issue-57979-deeply-nested-impl-trait-in-assoc-proj.stderr
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src/test/ui/impl-trait/issue-57979-deeply-nested-impl-trait-in-assoc-proj.rs
0 → 100644
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837856d1
// rust-lang/rust#57979 : the initial support for `impl Trait` didn't
// properly check syntax hidden behind an associated type projection,
// but it did catch *some cases*. This is checking that we continue to
// properly emit errors for those, even with the new
// future-incompatibility warnings.
//
// issue-57979-nested-impl-trait-in-assoc-proj.rs shows the main case
// that we were previously failing to catch.
struct
Deeper
<
T
>
(
T
);
mod
allowed
{
#![allow(nested_impl_trait)]
pub
trait
Foo
<
T
>
{
}
pub
trait
Bar
{
}
pub
trait
Quux
{
type
Assoc
;
}
pub
fn
demo
(
_
:
impl
Quux
<
Assoc
=
super
::
Deeper
<
impl
Foo
<
impl
Bar
>>>
)
{
}
//~^ ERROR nested `impl Trait` is not allowed
}
mod
warned
{
#![warn(nested_impl_trait)]
pub
trait
Foo
<
T
>
{
}
pub
trait
Bar
{
}
pub
trait
Quux
{
type
Assoc
;
}
pub
fn
demo
(
_
:
impl
Quux
<
Assoc
=
super
::
Deeper
<
impl
Foo
<
impl
Bar
>>>
)
{
}
//~^ ERROR nested `impl Trait` is not allowed
}
mod
denied
{
#![deny(nested_impl_trait)]
pub
trait
Foo
<
T
>
{
}
pub
trait
Bar
{
}
pub
trait
Quux
{
type
Assoc
;
}
pub
fn
demo
(
_
:
impl
Quux
<
Assoc
=
super
::
Deeper
<
impl
Foo
<
impl
Bar
>>>
)
{
}
//~^ ERROR nested `impl Trait` is not allowed
}
fn
main
()
{
}
src/test/ui/impl-trait/issue-57979-deeply-nested-impl-trait-in-assoc-proj.stderr
0 → 100644
浏览文件 @
837856d1
error[E0666]: nested `impl Trait` is not allowed
--> $DIR/issue-57979-deeply-nested-impl-trait-in-assoc-proj.rs:18:59
|
LL | pub fn demo(_: impl Quux<Assoc=super::Deeper<impl Foo<impl Bar>>>) { }
| ---------^^^^^^^^-
| | |
| | nested `impl Trait` here
| outer `impl Trait`
error[E0666]: nested `impl Trait` is not allowed
--> $DIR/issue-57979-deeply-nested-impl-trait-in-assoc-proj.rs:28:59
|
LL | pub fn demo(_: impl Quux<Assoc=super::Deeper<impl Foo<impl Bar>>>) { }
| ---------^^^^^^^^-
| | |
| | nested `impl Trait` here
| outer `impl Trait`
error[E0666]: nested `impl Trait` is not allowed
--> $DIR/issue-57979-deeply-nested-impl-trait-in-assoc-proj.rs:38:59
|
LL | pub fn demo(_: impl Quux<Assoc=super::Deeper<impl Foo<impl Bar>>>) { }
| ---------^^^^^^^^-
| | |
| | nested `impl Trait` here
| outer `impl Trait`
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0666`.
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