diff --git a/src/test/ui/generic-associated-types/issue-91883.rs b/src/test/ui/generic-associated-types/issue-91883.rs new file mode 100644 index 0000000000000..3d4585a44df80 --- /dev/null +++ b/src/test/ui/generic-associated-types/issue-91883.rs @@ -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, ()> + 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, ()> + where + 'db: 'tx, + { + loop {} + } +} + +fn main() {} diff --git a/src/test/ui/generic-associated-types/issue-91883.stderr b/src/test/ui/generic-associated-types/issue-91883.stderr new file mode 100644 index 0000000000000..ed700876e02dd --- /dev/null +++ b/src/test/ui/generic-associated-types/issue-91883.stderr @@ -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`.