diff options
Diffstat (limited to 'tests')
6 files changed, 79 insertions, 0 deletions
diff --git a/tests/ui/lazy-type-alias/auxiliary/eager.rs b/tests/ui/lazy-type-alias/auxiliary/eager.rs new file mode 100644 index 00000000000..8793a1701ec --- /dev/null +++ b/tests/ui/lazy-type-alias/auxiliary/eager.rs @@ -0,0 +1,6 @@ +// This crate does *not* have lazy type aliases enabled. + +#![allow(type_alias_bounds)] + +// The `Copy` bound is ignored both locally and externally for backward compatibility. +pub type Alias<T: Copy> = Option<T>; diff --git a/tests/ui/lazy-type-alias/auxiliary/lazy.rs b/tests/ui/lazy-type-alias/auxiliary/lazy.rs new file mode 100644 index 00000000000..caa7999b4f7 --- /dev/null +++ b/tests/ui/lazy-type-alias/auxiliary/lazy.rs @@ -0,0 +1,4 @@ +#![feature(lazy_type_alias)] +#![allow(incomplete_features)] + +pub type Alias<T: Copy> = Option<T>; diff --git a/tests/ui/lazy-type-alias/extern-crate-has-eager-type-aliases.rs b/tests/ui/lazy-type-alias/extern-crate-has-eager-type-aliases.rs new file mode 100644 index 00000000000..07389961c4c --- /dev/null +++ b/tests/ui/lazy-type-alias/extern-crate-has-eager-type-aliases.rs @@ -0,0 +1,23 @@ +// This test serves as a regression test for issue #114468 and it also ensures that we consider +// type aliases from external crates that don't have `lazy_type_alias` enabled to be eager. + +// aux-crate:eager=eager.rs +// edition: 2021 +// check-pass + +#![feature(lazy_type_alias)] +#![allow(incomplete_features)] + +// This used to crash when we were computing the variances of `Struct` since we would convert +// `eager::Alias<T>` to a weak projection due to the presence of `#![feature(lazy_type_alias)]` in +// this (!) crate and subsequently attempt to obtain the variances of the type alias associated with +// the weak projection which would panic because we don't compute this information for eager type +// aliases at all. +struct Struct<T>(eager::Alias<T>); + +fn main() { + // We want to ignore (or rather “end up ignoring”) the bound `T: Copy` since `Alias` should be + // treated as an eager type alias not just inside the crate it is defined in but also in + // dependent crates (like this one). + let _: eager::Alias<String>; +} diff --git a/tests/ui/lazy-type-alias/extern-crate-has-lazy-type-aliases.locally_eager.stderr b/tests/ui/lazy-type-alias/extern-crate-has-lazy-type-aliases.locally_eager.stderr new file mode 100644 index 00000000000..9e0e2bfa872 --- /dev/null +++ b/tests/ui/lazy-type-alias/extern-crate-has-lazy-type-aliases.locally_eager.stderr @@ -0,0 +1,15 @@ +error[E0277]: the trait bound `String: Copy` is not satisfied + --> $DIR/extern-crate-has-lazy-type-aliases.rs:15:12 + | +LL | let _: lazy::Alias<String>; + | ^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `String` + | +note: required by a bound on the type alias `Alias` + --> $DIR/auxiliary/lazy.rs:4:19 + | +LL | pub type Alias<T: Copy> = Option<T>; + | ^^^^ required by this bound + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0277`. diff --git a/tests/ui/lazy-type-alias/extern-crate-has-lazy-type-aliases.locally_lazy.stderr b/tests/ui/lazy-type-alias/extern-crate-has-lazy-type-aliases.locally_lazy.stderr new file mode 100644 index 00000000000..9e0e2bfa872 --- /dev/null +++ b/tests/ui/lazy-type-alias/extern-crate-has-lazy-type-aliases.locally_lazy.stderr @@ -0,0 +1,15 @@ +error[E0277]: the trait bound `String: Copy` is not satisfied + --> $DIR/extern-crate-has-lazy-type-aliases.rs:15:12 + | +LL | let _: lazy::Alias<String>; + | ^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `String` + | +note: required by a bound on the type alias `Alias` + --> $DIR/auxiliary/lazy.rs:4:19 + | +LL | pub type Alias<T: Copy> = Option<T>; + | ^^^^ required by this bound + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0277`. diff --git a/tests/ui/lazy-type-alias/extern-crate-has-lazy-type-aliases.rs b/tests/ui/lazy-type-alias/extern-crate-has-lazy-type-aliases.rs new file mode 100644 index 00000000000..31a19161b6c --- /dev/null +++ b/tests/ui/lazy-type-alias/extern-crate-has-lazy-type-aliases.rs @@ -0,0 +1,16 @@ +// revisions: locally_eager locally_lazy +// aux-crate:lazy=lazy.rs +// edition: 2021 + +// Test that we treat lazy type aliases from external crates as lazy independently of whether the +// local crate enables `lazy_type_alias` or not. + +#![cfg_attr( + locally_lazy, + feature(lazy_type_alias), + allow(incomplete_features) +)] + +fn main() { + let _: lazy::Alias<String>; //~ ERROR the trait bound `String: Copy` is not satisfied +} |