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Add more tests.
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‎tests/ui/parallel-rustc/ty-variance-issue-124423.rs

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// Test for #124423, which causes an ice bug: only `variances_of` returns `&[ty::Variance]`
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//
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//@ compile-flags: -Z threads=16
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//@ check-fail
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//@ parallel-front-end
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use std::fmt::Debug;
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fn elided(_: &impl Copy + 'a) -> _ { x }
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//~^ ERROR ambiguous `+` in a type
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR the placeholder `_` is not allowed within types on item signatures for return types
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fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
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//~^ ERROR ambiguous `+` in a type
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//~| ERROR at least one trait must be specified
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR use of undeclared lifetime name `'a`
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fn elided2( impl 'b) -> impl 'a + 'a { x }
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//~^ ERROR expected one of `:` or `|`, found `'b`
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//~| ERROR expected identifier, found keyword `impl`
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//~| ERROR at least one trait must be specified
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR use of undeclared lifetime name `'a`
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fn explicit2<'a>(_: &'a impl Copy + 'a) -> impl Copy + 'a { x }
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//~^ ERROR ambiguous `+` in a type
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fn foo<'a>(_: &impl Copy + 'a) -> impl 'b + 'a { x }
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//~^ ERROR ambiguous `+` in a type
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//~| ERROR at least one trait must be specified
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//~| ERROR use of undeclared lifetime name `'b`
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fn elided3(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
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//~^ ERROR ambiguous `+` in a type
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR at least one trait is required for an object type
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fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
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//~^ ERROR ambiguous `+` in a type
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR at least one trait is required for an object type
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//~| ERROR no function or associated item named `u32` found for struct `Box<_, _>` in the current scope
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fn elided4(_: &impl Copy + 'a) -> new { x(x) }
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//~^ ERROR ambiguous `+` in a type
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR cannot find type `new` in this scope
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trait LifetimeTrait<'a> {}
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impl<'a> LifetimeTrait<'a> for &'a Box<dyn 'a> {}
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//~^ ERROR at least one trait is required for an object type
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fn main() {}

‎tests/ui/parallel-rustc/ty-variance-issue-124423.stderr

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error: ambiguous `+` in a type
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|
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LL | fn elided(_: &impl Copy + 'a) -> _ { x }
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| ^^^^^^^^^^^^^^
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|
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help: try adding parentheses
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|
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LL | fn elided(_: &(impl Copy + 'a)) -> _ { x }
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| + +
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error: ambiguous `+` in a type
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|
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LL | fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
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| ^^^^^^^^^^^^^^
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|
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help: try adding parentheses
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|
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LL | fn explicit<'b>(_: &'a (impl Copy + 'a)) -> impl 'a { x }
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| + +
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error: expected identifier, found keyword `impl`
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|
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LL | fn elided2( impl 'b) -> impl 'a + 'a { x }
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| ^^^^ expected identifier, found keyword
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error: expected one of `:` or `|`, found `'b`
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|
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LL | fn elided2( impl 'b) -> impl 'a + 'a { x }
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| ^^ expected one of `:` or `|`
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error: ambiguous `+` in a type
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|
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LL | fn explicit2<'a>(_: &'a impl Copy + 'a) -> impl Copy + 'a { x }
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| ^^^^^^^^^^^^^^
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|
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help: try adding parentheses
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|
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LL | fn explicit2<'a>(_: &'a (impl Copy + 'a)) -> impl Copy + 'a { x }
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| + +
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error: ambiguous `+` in a type
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|
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LL | fn foo<'a>(_: &impl Copy + 'a) -> impl 'b + 'a { x }
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| ^^^^^^^^^^^^^^
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|
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help: try adding parentheses
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|
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LL | fn foo<'a>(_: &(impl Copy + 'a)) -> impl 'b + 'a { x }
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| + +
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error: ambiguous `+` in a type
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|
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LL | fn elided3(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
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| ^^^^^^^^^^^^^^
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|
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help: try adding parentheses
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|
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LL | fn elided3(_: &(impl Copy + 'a)) -> Box<dyn 'a> { Box::new(x) }
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| + +
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error: ambiguous `+` in a type
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|
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LL | fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
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| ^^^^^^^^^^^^^^
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|
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help: try adding parentheses
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|
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LL | fn x<'b>(_: &'a (impl Copy + 'a)) -> Box<dyn 'b> { Box::u32(x) }
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| + +
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error: ambiguous `+` in a type
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|
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LL | fn elided4(_: &impl Copy + 'a) -> new { x(x) }
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| ^^^^^^^^^^^^^^
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|
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help: try adding parentheses
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|
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LL | fn elided4(_: &(impl Copy + 'a)) -> new { x(x) }
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| + +
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error: at least one trait must be specified
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|
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LL | fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
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| ^^^^^^^
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error: at least one trait must be specified
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|
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LL | fn elided2( impl 'b) -> impl 'a + 'a { x }
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| ^^^^^^^^^^^^
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error: at least one trait must be specified
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|
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LL | fn foo<'a>(_: &impl Copy + 'a) -> impl 'b + 'a { x }
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| ^^^^^^^^^^^^
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn elided(_: &impl Copy + 'a) -> _ { x }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn elided<'a>(_: &impl Copy + 'a) -> _ { x }
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| ++++
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn explicit<'a, 'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
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| +++
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn explicit<'a, 'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
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| +++
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn explicit<'a, 'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
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| +++
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn elided2( impl 'b) -> impl 'a + 'a { x }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn elided2<'a>( impl 'b) -> impl 'a + 'a { x }
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| ++++
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn elided2( impl 'b) -> impl 'a + 'a { x }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn elided2<'a>( impl 'b) -> impl 'a + 'a { x }
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| ++++
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error[E0261]: use of undeclared lifetime name `'b`
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|
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LL | fn foo<'a>(_: &impl Copy + 'a) -> impl 'b + 'a { x }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'b` here
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|
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LL | fn foo<'b, 'a>(_: &impl Copy + 'a) -> impl 'b + 'a { x }
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| +++
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn elided3(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn elided3<'a>(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
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| ++++
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn elided3(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn elided3<'a>(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
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| ++++
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn x<'a, 'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
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| +++
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn x<'a, 'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
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| +++
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error[E0261]: use of undeclared lifetime name `'a`
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|
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LL | fn elided4(_: &impl Copy + 'a) -> new { x(x) }
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| ^^ undeclared lifetime
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|
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help: consider introducing lifetime `'a` here
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|
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LL | fn elided4<'a>(_: &impl Copy + 'a) -> new { x(x) }
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| ++++
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error[E0412]: cannot find type `new` in this scope
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LL | fn elided4(_: &impl Copy + 'a) -> new { x(x) }
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| ^^^ not found in this scope
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error[E0224]: at least one trait is required for an object type
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|
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LL | fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
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| ^^^^^^
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error[E0224]: at least one trait is required for an object type
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|
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LL | impl<'a> LifetimeTrait<'a> for &'a Box<dyn 'a> {}
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| ^^^^^^
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error[E0224]: at least one trait is required for an object type
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|
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LL | fn elided3(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
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| ^^^^^^
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error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
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LL | fn elided(_: &impl Copy + 'a) -> _ { x }
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| ^ not allowed in type signatures
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error[E0599]: no function or associated item named `u32` found for struct `Box<_, _>` in the current scope
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|
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LL | fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
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| ^^^ function or associated item not found in `Box<_, _>`
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|
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note: if you're trying to build a new `Box<_, _>` consider using one of the following associated functions:
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Box::<T>::new
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Box::<T>::new_uninit
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Box::<T>::new_zeroed
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Box::<T>::try_new
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and 22 others
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--> $SRC_DIR/alloc/src/boxed.rs:LL:COL
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error: aborting due to 30 previous errors
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Some errors have detailed explanations: E0121, E0224, E0261, E0412, E0599.
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For more information about an error, try `rustc --explain E0121`.

‎tests/ui/parallel-rustc/ty-variance-issue-127971.rs

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// Test for #127971, which causes an ice bug: only `variances_of` returns `&[ty::Variance]`
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//
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//@ compile-flags: -Z threads=16
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//@ check-fail
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//@ parallel-front-end
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use std::fmt::Debug;
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fn elided(_: &impl Copy + 'a) -> _ { x }
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//~^ ERROR ambiguous `+` in a type
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR the placeholder `_` is not allowed within types on item signatures for return types
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fn foo<'a>(_: &impl Copy + 'a) -> impl 'b + 'a { x }
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//~^ ERROR ambiguous `+` in a type
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//~| ERROR at least one trait must be specified
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//~| ERROR use of undeclared lifetime name `'b`
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fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
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//~^ ERROR ambiguous `+` in a type
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR use of undeclared lifetime name `'a`
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//~| ERROR at least one trait is required for an object type
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//~| ERROR no function or associated item named `u32` found for struct `Box<_, _>` in the current scope
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fn main() {}

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