Thanks to visit codestin.com
Credit goes to github.com

Skip to content

Add a ui test for issue #91883 #98538

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Jun 26, 2022
Merged

Add a ui test for issue #91883 #98538

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
42 changes: 42 additions & 0 deletions src/test/ui/generic-associated-types/issue-91883.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,42 @@
#![feature(generic_associated_types)]

use std::fmt::Debug;
use std::marker::PhantomData;

#[derive(Debug)]
pub struct TransactionImpl<'db> {
_marker: PhantomData<&'db ()>,
}

#[derive(Debug)]
pub struct CursorImpl<'txn> {
_marker: PhantomData<&'txn ()>,
}

pub trait Cursor<'txn> {}

pub trait Transaction<'db>: Send + Sync + Debug + Sized {
type Cursor<'tx>: Cursor<'tx>
where
'db: 'tx,
Self: 'tx;

fn cursor<'tx>(&'tx self) -> Result<Self::Cursor<'tx>, ()>
where
'db: 'tx;
}

impl<'tx> Cursor<'tx> for CursorImpl<'tx> {}

impl<'db> Transaction<'db> for TransactionImpl<'db> {
type Cursor<'tx> = CursorImpl<'tx>; //~ ERROR lifetime bound not satisfied

fn cursor<'tx>(&'tx self) -> Result<Self::Cursor<'tx>, ()>
where
'db: 'tx,
{
loop {}
}
}

fn main() {}
26 changes: 26 additions & 0 deletions src/test/ui/generic-associated-types/issue-91883.stderr
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
error[E0478]: lifetime bound not satisfied
--> $DIR/issue-91883.rs:32:24
|
LL | / type Cursor<'tx>: Cursor<'tx>
LL | | where
LL | | 'db: 'tx,
LL | | Self: 'tx;
| |__________________- definition of `Cursor` from trait
...
LL | type Cursor<'tx> = CursorImpl<'tx>;
| ^^^^^^^^^^^^^^^- help: try copying these clauses from the trait: `where 'db: 'tx, Self: 'tx`
|
note: lifetime parameter instantiated with the lifetime `'db` as defined here
--> $DIR/issue-91883.rs:31:6
|
LL | impl<'db> Transaction<'db> for TransactionImpl<'db> {
| ^^^
note: but lifetime parameter must outlive the lifetime `'tx` as defined here
--> $DIR/issue-91883.rs:32:17
|
LL | type Cursor<'tx> = CursorImpl<'tx>;
| ^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0478`.