diff options
Diffstat (limited to 'src/test/ui/underscore-lifetime')
30 files changed, 468 insertions, 0 deletions
diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore-in-struct.rs b/src/test/ui/underscore-lifetime/dyn-trait-underscore-in-struct.rs new file mode 100644 index 000000000..e1deab736 --- /dev/null +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore-in-struct.rs @@ -0,0 +1,12 @@ +// Check that the `'_` in `dyn Trait + '_` acts like ordinary elision, +// and not like an object lifetime default. +// +// cc #48468 + +use std::fmt::Debug; + +struct Foo { + x: Box<dyn Debug + '_>, //~ ERROR missing lifetime specifier +} + +fn main() {} diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore-in-struct.stderr b/src/test/ui/underscore-lifetime/dyn-trait-underscore-in-struct.stderr new file mode 100644 index 000000000..fd0860028 --- /dev/null +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore-in-struct.stderr @@ -0,0 +1,15 @@ +error[E0106]: missing lifetime specifier + --> $DIR/dyn-trait-underscore-in-struct.rs:9:24 + | +LL | x: Box<dyn Debug + '_>, + | ^^ expected named lifetime parameter + | +help: consider introducing a named lifetime parameter + | +LL ~ struct Foo<'a> { +LL ~ x: Box<dyn Debug + 'a>, + | + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0106`. diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.rs b/src/test/ui/underscore-lifetime/dyn-trait-underscore.rs new file mode 100644 index 000000000..fa6e65c7d --- /dev/null +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore.rs @@ -0,0 +1,20 @@ +// Check that the `'_` in `dyn Trait + '_` acts like ordinary elision, +// and not like an object lifetime default. +// +// cc #48468 + +fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T>> { + // ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static` + Box::new(items.iter()) + //~^ ERROR lifetime may not live long enough +} + +fn b<T>(items: &[T]) -> Box<dyn Iterator<Item=&T> + '_> { + Box::new(items.iter()) // OK, equivalent to c +} + +fn c<'a, T>(items: &'a [T]) -> Box<dyn Iterator<Item=&'a T> + 'a> { + Box::new(items.iter()) // OK, equivalent to b +} + +fn main() { } diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr new file mode 100644 index 000000000..60b0b3ee7 --- /dev/null +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr @@ -0,0 +1,16 @@ +error: lifetime may not live long enough + --> $DIR/dyn-trait-underscore.rs:8:5 + | +LL | fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T>> { + | - let's call the lifetime of this reference `'1` +LL | // ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static` +LL | Box::new(items.iter()) + | ^^^^^^^^^^^^^^^^^^^^^^ returning this value requires that `'1` must outlive `'static` + | +help: to declare that the trait object captures data from argument `items`, you can add an explicit `'_` lifetime bound + | +LL | fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T> + '_> { + | ++++ + +error: aborting due to previous error + diff --git a/src/test/ui/underscore-lifetime/in-binder.rs b/src/test/ui/underscore-lifetime/in-binder.rs new file mode 100644 index 000000000..74dc331b0 --- /dev/null +++ b/src/test/ui/underscore-lifetime/in-binder.rs @@ -0,0 +1,35 @@ +// Check that we error when `'_` appears as the name of a lifetime parameter. +// +// Regression test for #52098. + +struct IceCube<'a> { + v: Vec<&'a char> +} + +impl<'_> IceCube<'_> {} +//~^ ERROR `'_` cannot be used here + +struct Struct<'_> { + //~^ ERROR `'_` cannot be used here + v: Vec<&'static char> +} + +enum Enum<'_> { + //~^ ERROR `'_` cannot be used here + Variant +} + +union Union<'_> { + //~^ ERROR `'_` cannot be used here + a: u32 +} + +trait Trait<'_> { + //~^ ERROR `'_` cannot be used here +} + +fn foo<'_>() { + //~^ ERROR `'_` cannot be used here +} + +fn main() {} diff --git a/src/test/ui/underscore-lifetime/in-binder.stderr b/src/test/ui/underscore-lifetime/in-binder.stderr new file mode 100644 index 000000000..fcd7eddb5 --- /dev/null +++ b/src/test/ui/underscore-lifetime/in-binder.stderr @@ -0,0 +1,39 @@ +error[E0637]: `'_` cannot be used here + --> $DIR/in-binder.rs:9:6 + | +LL | impl<'_> IceCube<'_> {} + | ^^ `'_` is a reserved lifetime name + +error[E0637]: `'_` cannot be used here + --> $DIR/in-binder.rs:12:15 + | +LL | struct Struct<'_> { + | ^^ `'_` is a reserved lifetime name + +error[E0637]: `'_` cannot be used here + --> $DIR/in-binder.rs:17:11 + | +LL | enum Enum<'_> { + | ^^ `'_` is a reserved lifetime name + +error[E0637]: `'_` cannot be used here + --> $DIR/in-binder.rs:22:13 + | +LL | union Union<'_> { + | ^^ `'_` is a reserved lifetime name + +error[E0637]: `'_` cannot be used here + --> $DIR/in-binder.rs:27:13 + | +LL | trait Trait<'_> { + | ^^ `'_` is a reserved lifetime name + +error[E0637]: `'_` cannot be used here + --> $DIR/in-binder.rs:31:8 + | +LL | fn foo<'_>() { + | ^^ `'_` is a reserved lifetime name + +error: aborting due to 6 previous errors + +For more information about this error, try `rustc --explain E0637`. diff --git a/src/test/ui/underscore-lifetime/in-fn-return-illegal.rs b/src/test/ui/underscore-lifetime/in-fn-return-illegal.rs new file mode 100644 index 000000000..a46ece7d4 --- /dev/null +++ b/src/test/ui/underscore-lifetime/in-fn-return-illegal.rs @@ -0,0 +1,7 @@ +// Check that the `'_` used in structs/enums gives an error. + +use std::fmt::Debug; + +fn foo(x: &u32, y: &u32) -> &'_ u32 { loop { } } //~ ERROR missing lifetime specifier + +fn main() { } diff --git a/src/test/ui/underscore-lifetime/in-fn-return-illegal.stderr b/src/test/ui/underscore-lifetime/in-fn-return-illegal.stderr new file mode 100644 index 000000000..6a104e8f9 --- /dev/null +++ b/src/test/ui/underscore-lifetime/in-fn-return-illegal.stderr @@ -0,0 +1,15 @@ +error[E0106]: missing lifetime specifier + --> $DIR/in-fn-return-illegal.rs:5:30 + | +LL | fn foo(x: &u32, y: &u32) -> &'_ u32 { loop { } } + | ---- ---- ^^ expected named lifetime parameter + | + = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from `x` or `y` +help: consider introducing a named lifetime parameter + | +LL | fn foo<'a>(x: &'a u32, y: &'a u32) -> &'a u32 { loop { } } + | ++++ ++ ++ ~~ + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0106`. diff --git a/src/test/ui/underscore-lifetime/in-struct.rs b/src/test/ui/underscore-lifetime/in-struct.rs new file mode 100644 index 000000000..bed89c7dc --- /dev/null +++ b/src/test/ui/underscore-lifetime/in-struct.rs @@ -0,0 +1,13 @@ +// Check that the `'_` used in structs/enums gives an error. + +use std::fmt::Debug; + +struct Foo { + x: &'_ u32, //~ ERROR missing lifetime specifier +} + +enum Bar { + Variant(&'_ u32), //~ ERROR missing lifetime specifier +} + +fn main() { } diff --git a/src/test/ui/underscore-lifetime/in-struct.stderr b/src/test/ui/underscore-lifetime/in-struct.stderr new file mode 100644 index 000000000..84183f61e --- /dev/null +++ b/src/test/ui/underscore-lifetime/in-struct.stderr @@ -0,0 +1,27 @@ +error[E0106]: missing lifetime specifier + --> $DIR/in-struct.rs:6:9 + | +LL | x: &'_ u32, + | ^^ expected named lifetime parameter + | +help: consider introducing a named lifetime parameter + | +LL ~ struct Foo<'a> { +LL ~ x: &'a u32, + | + +error[E0106]: missing lifetime specifier + --> $DIR/in-struct.rs:10:14 + | +LL | Variant(&'_ u32), + | ^^ expected named lifetime parameter + | +help: consider introducing a named lifetime parameter + | +LL ~ enum Bar<'a> { +LL ~ Variant(&'a u32), + | + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0106`. diff --git a/src/test/ui/underscore-lifetime/underscore-lifetime-binders.rs b/src/test/ui/underscore-lifetime/underscore-lifetime-binders.rs new file mode 100644 index 000000000..3d049cc56 --- /dev/null +++ b/src/test/ui/underscore-lifetime/underscore-lifetime-binders.rs @@ -0,0 +1,22 @@ +struct Foo<'a>(&'a u8); +struct Baz<'a>(&'_ &'a u8); //~ ERROR missing lifetime specifier + +fn foo<'_> //~ ERROR cannot be used here +(_: Foo<'_>) {} + +trait Meh<'a> {} +impl<'a> Meh<'a> for u8 {} + +fn meh() -> Box<dyn for<'_> Meh<'_>> //~ ERROR cannot be used here +//~^ ERROR missing lifetime specifier +{ + Box::new(5u8) +} + +fn foo2(_: &'_ u8, y: &'_ u8) -> &'_ u8 { y } //~ ERROR missing lifetime specifier + +fn main() { + let x = 5; + foo(Foo(&x)); + let _ = meh(); +} diff --git a/src/test/ui/underscore-lifetime/underscore-lifetime-binders.stderr b/src/test/ui/underscore-lifetime/underscore-lifetime-binders.stderr new file mode 100644 index 000000000..50401791e --- /dev/null +++ b/src/test/ui/underscore-lifetime/underscore-lifetime-binders.stderr @@ -0,0 +1,51 @@ +error[E0106]: missing lifetime specifier + --> $DIR/underscore-lifetime-binders.rs:2:17 + | +LL | struct Baz<'a>(&'_ &'a u8); + | ^^ expected named lifetime parameter + | +help: consider using the `'a` lifetime + | +LL | struct Baz<'a>(&'a &'a u8); + | ~~ + +error[E0637]: `'_` cannot be used here + --> $DIR/underscore-lifetime-binders.rs:4:8 + | +LL | fn foo<'_> + | ^^ `'_` is a reserved lifetime name + +error[E0637]: `'_` cannot be used here + --> $DIR/underscore-lifetime-binders.rs:10:25 + | +LL | fn meh() -> Box<dyn for<'_> Meh<'_>> + | ^^ `'_` is a reserved lifetime name + +error[E0106]: missing lifetime specifier + --> $DIR/underscore-lifetime-binders.rs:10:33 + | +LL | fn meh() -> Box<dyn for<'_> Meh<'_>> + | ^^ expected named lifetime parameter + | + = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from +help: consider using the `'static` lifetime + | +LL | fn meh() -> Box<dyn for<'_> Meh<'static>> + | ~~~~~~~ + +error[E0106]: missing lifetime specifier + --> $DIR/underscore-lifetime-binders.rs:16:35 + | +LL | fn foo2(_: &'_ u8, y: &'_ u8) -> &'_ u8 { y } + | ------ ------ ^^ expected named lifetime parameter + | + = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from argument 1 or `y` +help: consider introducing a named lifetime parameter + | +LL | fn foo2<'a>(_: &'a u8, y: &'a u8) -> &'a u8 { y } + | ++++ ~~ ~~ ~~ + +error: aborting due to 5 previous errors + +Some errors have detailed explanations: E0106, E0637. +For more information about an error, try `rustc --explain E0106`. diff --git a/src/test/ui/underscore-lifetime/underscore-lifetime-elison-mismatch.rs b/src/test/ui/underscore-lifetime/underscore-lifetime-elison-mismatch.rs new file mode 100644 index 000000000..c61126884 --- /dev/null +++ b/src/test/ui/underscore-lifetime/underscore-lifetime-elison-mismatch.rs @@ -0,0 +1,4 @@ +fn foo(x: &mut Vec<&'_ u8>, y: &'_ u8) { x.push(y); } +//~^ ERROR lifetime may not live long enough + +fn main() {} diff --git a/src/test/ui/underscore-lifetime/underscore-lifetime-elison-mismatch.stderr b/src/test/ui/underscore-lifetime/underscore-lifetime-elison-mismatch.stderr new file mode 100644 index 000000000..2b34f0c55 --- /dev/null +++ b/src/test/ui/underscore-lifetime/underscore-lifetime-elison-mismatch.stderr @@ -0,0 +1,16 @@ +error: lifetime may not live long enough + --> $DIR/underscore-lifetime-elison-mismatch.rs:1:42 + | +LL | fn foo(x: &mut Vec<&'_ u8>, y: &'_ u8) { x.push(y); } + | - - ^^^^^^^^^ argument requires that `'1` must outlive `'2` + | | | + | | let's call the lifetime of this reference `'1` + | let's call the lifetime of this reference `'2` + | +help: consider introducing a named lifetime parameter + | +LL | fn foo<'a>(x: &mut Vec<&'a u8>, y: &'a u8) { x.push(y); } + | ++++ ~~ ~~ + +error: aborting due to previous error + diff --git a/src/test/ui/underscore-lifetime/underscore-outlives-bounds.rs b/src/test/ui/underscore-lifetime/underscore-outlives-bounds.rs new file mode 100644 index 000000000..567cc7a3f --- /dev/null +++ b/src/test/ui/underscore-lifetime/underscore-outlives-bounds.rs @@ -0,0 +1,8 @@ +// Regression test to check that `'b: '_` gets an error, because it's +// basically useless. +// +// #54902 + +trait Foo<'a> {} +impl<'b: '_> Foo<'b> for i32 {} //~ ERROR `'_` cannot be used here +fn main() { } diff --git a/src/test/ui/underscore-lifetime/underscore-outlives-bounds.stderr b/src/test/ui/underscore-lifetime/underscore-outlives-bounds.stderr new file mode 100644 index 000000000..4b38a26f9 --- /dev/null +++ b/src/test/ui/underscore-lifetime/underscore-outlives-bounds.stderr @@ -0,0 +1,9 @@ +error[E0637]: `'_` cannot be used here + --> $DIR/underscore-outlives-bounds.rs:7:10 + | +LL | impl<'b: '_> Foo<'b> for i32 {} + | ^^ `'_` is a reserved lifetime name + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0637`. diff --git a/src/test/ui/underscore-lifetime/where-clause-inherent-impl-ampersand.rs b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-ampersand.rs new file mode 100644 index 000000000..43de30944 --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-ampersand.rs @@ -0,0 +1,18 @@ +// revisions: rust2015 rust2018 +//[rust2018] edition:2018 + +trait WithType<T> {} +trait WithRegion<'a> { } + +struct Foo<T> { + t: T +} + +impl<T> Foo<T> +where + T: WithType<&u32> +//[rust2015]~^ ERROR `&` without an explicit lifetime name cannot be used here +//[rust2018]~^^ ERROR `&` without an explicit lifetime name cannot be used here +{ } + +fn main() {} diff --git a/src/test/ui/underscore-lifetime/where-clause-inherent-impl-ampersand.rust2015.stderr b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-ampersand.rust2015.stderr new file mode 100644 index 000000000..fe726cb49 --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-ampersand.rust2015.stderr @@ -0,0 +1,9 @@ +error[E0637]: `&` without an explicit lifetime name cannot be used here + --> $DIR/where-clause-inherent-impl-ampersand.rs:13:17 + | +LL | T: WithType<&u32> + | ^ explicit lifetime name needed here + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0637`. diff --git a/src/test/ui/underscore-lifetime/where-clause-inherent-impl-ampersand.rust2018.stderr b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-ampersand.rust2018.stderr new file mode 100644 index 000000000..fe726cb49 --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-ampersand.rust2018.stderr @@ -0,0 +1,9 @@ +error[E0637]: `&` without an explicit lifetime name cannot be used here + --> $DIR/where-clause-inherent-impl-ampersand.rs:13:17 + | +LL | T: WithType<&u32> + | ^ explicit lifetime name needed here + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0637`. diff --git a/src/test/ui/underscore-lifetime/where-clause-inherent-impl-underscore.rs b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-underscore.rs new file mode 100644 index 000000000..38189816d --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-underscore.rs @@ -0,0 +1,17 @@ +// revisions: rust2015 rust2018 +//[rust2018] edition:2018 + +trait WithType<T> {} +trait WithRegion<'a> { } + +struct Foo<T> { + t: T +} + +impl<T> Foo<T> +where + T: WithRegion<'_> +//[rust2015,rust2018]~^ ERROR `'_` cannot be used here +{ } + +fn main() {} diff --git a/src/test/ui/underscore-lifetime/where-clause-inherent-impl-underscore.rust2015.stderr b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-underscore.rust2015.stderr new file mode 100644 index 000000000..95939fd6b --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-underscore.rust2015.stderr @@ -0,0 +1,9 @@ +error[E0637]: `'_` cannot be used here + --> $DIR/where-clause-inherent-impl-underscore.rs:13:19 + | +LL | T: WithRegion<'_> + | ^^ `'_` is a reserved lifetime name + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0637`. diff --git a/src/test/ui/underscore-lifetime/where-clause-inherent-impl-underscore.rust2018.stderr b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-underscore.rust2018.stderr new file mode 100644 index 000000000..95939fd6b --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-inherent-impl-underscore.rust2018.stderr @@ -0,0 +1,9 @@ +error[E0637]: `'_` cannot be used here + --> $DIR/where-clause-inherent-impl-underscore.rs:13:19 + | +LL | T: WithRegion<'_> + | ^^ `'_` is a reserved lifetime name + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0637`. diff --git a/src/test/ui/underscore-lifetime/where-clause-trait-impl-region.rs b/src/test/ui/underscore-lifetime/where-clause-trait-impl-region.rs new file mode 100644 index 000000000..09e5bbd84 --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-trait-impl-region.rs @@ -0,0 +1,15 @@ +// revisions: rust2015 rust2018 +//[rust2018] edition:2018 + +trait WithType<T> {} +trait WithRegion<'a> { } + +trait Foo { } + +impl<T> Foo for Vec<T> +where + T: WithType<&u32> +//[rust2015,rust2018]~^ ERROR `&` without an explicit lifetime name cannot be used here +{ } + +fn main() {} diff --git a/src/test/ui/underscore-lifetime/where-clause-trait-impl-region.rust2015.stderr b/src/test/ui/underscore-lifetime/where-clause-trait-impl-region.rust2015.stderr new file mode 100644 index 000000000..fbd14de21 --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-trait-impl-region.rust2015.stderr @@ -0,0 +1,9 @@ +error[E0637]: `&` without an explicit lifetime name cannot be used here + --> $DIR/where-clause-trait-impl-region.rs:11:17 + | +LL | T: WithType<&u32> + | ^ explicit lifetime name needed here + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0637`. diff --git a/src/test/ui/underscore-lifetime/where-clause-trait-impl-region.rust2018.stderr b/src/test/ui/underscore-lifetime/where-clause-trait-impl-region.rust2018.stderr new file mode 100644 index 000000000..fbd14de21 --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-trait-impl-region.rust2018.stderr @@ -0,0 +1,9 @@ +error[E0637]: `&` without an explicit lifetime name cannot be used here + --> $DIR/where-clause-trait-impl-region.rs:11:17 + | +LL | T: WithType<&u32> + | ^ explicit lifetime name needed here + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0637`. diff --git a/src/test/ui/underscore-lifetime/where-clause-trait-impl-underscore.rs b/src/test/ui/underscore-lifetime/where-clause-trait-impl-underscore.rs new file mode 100644 index 000000000..371d2e4ba --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-trait-impl-underscore.rs @@ -0,0 +1,15 @@ +// revisions: rust2015 rust2018 +//[rust2018] edition:2018 + +trait WithType<T> {} +trait WithRegion<'a> { } + +trait Foo { } + +impl<T> Foo for Vec<T> +where + T: WithRegion<'_> +//[rust2015,rust2018]~^ ERROR `'_` cannot be used here +{ } + +fn main() {} diff --git a/src/test/ui/underscore-lifetime/where-clause-trait-impl-underscore.rust2015.stderr b/src/test/ui/underscore-lifetime/where-clause-trait-impl-underscore.rust2015.stderr new file mode 100644 index 000000000..92caff0dc --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-trait-impl-underscore.rust2015.stderr @@ -0,0 +1,9 @@ +error[E0637]: `'_` cannot be used here + --> $DIR/where-clause-trait-impl-underscore.rs:11:19 + | +LL | T: WithRegion<'_> + | ^^ `'_` is a reserved lifetime name + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0637`. diff --git a/src/test/ui/underscore-lifetime/where-clause-trait-impl-underscore.rust2018.stderr b/src/test/ui/underscore-lifetime/where-clause-trait-impl-underscore.rust2018.stderr new file mode 100644 index 000000000..92caff0dc --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clause-trait-impl-underscore.rust2018.stderr @@ -0,0 +1,9 @@ +error[E0637]: `'_` cannot be used here + --> $DIR/where-clause-trait-impl-underscore.rs:11:19 + | +LL | T: WithRegion<'_> + | ^^ `'_` is a reserved lifetime name + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0637`. diff --git a/src/test/ui/underscore-lifetime/where-clauses.rs b/src/test/ui/underscore-lifetime/where-clauses.rs new file mode 100644 index 000000000..ee6823b80 --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clauses.rs @@ -0,0 +1,7 @@ +trait Foo<'a> {} + +impl<'b: '_> Foo<'b> for i32 {} //~ ERROR `'_` cannot be used here + +impl<T: '_> Foo<'static> for Vec<T> {} //~ ERROR `'_` cannot be used here + +fn main() { } diff --git a/src/test/ui/underscore-lifetime/where-clauses.stderr b/src/test/ui/underscore-lifetime/where-clauses.stderr new file mode 100644 index 000000000..1a3ea4af7 --- /dev/null +++ b/src/test/ui/underscore-lifetime/where-clauses.stderr @@ -0,0 +1,15 @@ +error[E0637]: `'_` cannot be used here + --> $DIR/where-clauses.rs:3:10 + | +LL | impl<'b: '_> Foo<'b> for i32 {} + | ^^ `'_` is a reserved lifetime name + +error[E0637]: `'_` cannot be used here + --> $DIR/where-clauses.rs:5:9 + | +LL | impl<T: '_> Foo<'static> for Vec<T> {} + | ^^ `'_` is a reserved lifetime name + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0637`. |