mirror of https://github.com/rust-lang/rust
117 lines
2.9 KiB
Rust
117 lines
2.9 KiB
Rust
// FIXME: the following cases need to suggest more things to make users reach a working end state.
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mod bav {
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trait OtherTrait<'a> {}
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impl<'a> OtherTrait<'a> for &'a () {}
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trait ObjectTrait {
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type Assoc: Bar;
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}
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trait MyTrait {
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fn use_self(&self) -> &() { panic!() }
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}
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trait Bar {}
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impl MyTrait for Box<dyn ObjectTrait<Assoc = i32>> {
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fn use_self(&self) -> &() { panic!() }
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}
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impl Bar for i32 {}
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fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = i32>>) -> impl OtherTrait<'a> {
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val.use_self() //~ ERROR cannot return value referencing function parameter
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}
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}
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mod bap {
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trait OtherTrait<'a> {}
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impl<'a> OtherTrait<'a> for &'a () {}
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trait ObjectTrait {
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type Assoc: Bar;
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}
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trait MyTrait {
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fn use_self(&self) -> &() { panic!() }
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}
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trait Bar {}
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impl MyTrait for Box<dyn ObjectTrait<Assoc = i32>> {
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fn use_self(&self) -> &() { panic!() }
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}
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impl Bar for i32 {}
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fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = i32>>) -> impl OtherTrait<'a> + 'a {
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val.use_self() //~ ERROR E0515
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}
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}
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// This case in particular requires the user to write all of the bounds we have in `mod bax`.
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mod bay {
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trait OtherTrait<'a> {}
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impl<'a> OtherTrait<'a> for &'a () {}
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trait ObjectTrait {
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type Assoc: Bar;
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}
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trait MyTrait {
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fn use_self(&self) -> &() { panic!() }
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}
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trait Bar {}
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impl MyTrait for Box<dyn ObjectTrait<Assoc = i32>> {
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fn use_self(&self) -> &() { panic!() }
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}
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impl Bar for i32 {}
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fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = i32> + 'a>) -> &'a () {
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val.use_self()
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//~^ ERROR: cannot return value referencing function parameter `val`
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//~| ERROR: borrowed data escapes outside of function
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}
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}
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mod bax {
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trait OtherTrait<'a> {}
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impl<'a> OtherTrait<'a> for &'a () {}
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trait ObjectTrait {
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type Assoc: Bar;
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}
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trait MyTrait<'a> {
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fn use_self(&'a self) -> &'a () { panic!() }
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}
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trait Bar {}
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impl<'a> MyTrait<'a> for Box<dyn ObjectTrait<Assoc = i32> + 'a> {
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fn use_self(&'a self) -> &'a () { panic!() }
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}
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impl Bar for i32 {}
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fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = i32> + 'a>) -> &'a () {
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val.use_self()
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//~^ ERROR: cannot return value referencing function parameter `val`
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}
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}
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mod baw {
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trait OtherTrait<'a> {}
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impl<'a> OtherTrait<'a> for &'a () {}
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trait ObjectTrait {
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type Assoc: Bar;
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}
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trait MyTrait {
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fn use_self(&self) -> &() { panic!() }
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}
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trait Bar {}
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impl<'a> MyTrait for Box<dyn ObjectTrait<Assoc = Box<dyn Bar>>> {
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fn use_self(&self) -> &() { panic!() }
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}
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fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = Box<dyn Bar>>>) -> impl OtherTrait<'a> + 'a{
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val.use_self() //~ ERROR E0515
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}
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}
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fn main() {}
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