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Fix 'unused lifetime parameter' on lifetimes in with<> #36

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Fix 'unused lifetime parameter' on lifetimes in with<> #36

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11 changes: 10 additions & 1 deletion lender/src/higher_order.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -339,7 +339,16 @@ macro_rules! __covar__ {
)?
$hr
>(
::core::marker::PhantomData<fn() -> ($Ret, &$hr ())>
::core::marker::PhantomData<
(
fn() -> ($Ret, &$hr ()),
$(
$($(
&$lt (),
)+)?
)?
)
>
);

// This function only compiles if __CovarCheck (and thus $Ret)
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4 changes: 2 additions & 2 deletions lender/tests/fail/try_collect.stderr
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Expand Up @@ -25,5 +25,5 @@ error: implementation of `lender::FromLender` is not general enough
40 | let wrapper: ChangeOutputType<Result<(), _>, _> = lender.try_collect::<Wrapper<TryShunt<'_, _>>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ implementation of `lender::FromLender` is not general enough
|
= note: `Wrapper<lender::TryShunt<'2, &mut lender::FromFn<(), {closure@$DIR/src/higher_order.rs:381:15: 381:43}>>>` must implement `lender::FromLender<lender::TryShunt<'1, &mut lender::FromFn<(), {closure@$DIR/src/higher_order.rs:381:15: 381:43}>>>`, for any lifetime `'1`...
= note: ...but it actually implements `lender::FromLender<lender::TryShunt<'2, &mut lender::FromFn<(), {closure@$DIR/src/higher_order.rs:381:15: 381:43}>>>`, for some specific lifetime `'2`
= note: `Wrapper<lender::TryShunt<'2, &mut lender::FromFn<(), {closure@$DIR/src/higher_order.rs:390:15: 390:43}>>>` must implement `lender::FromLender<lender::TryShunt<'1, &mut lender::FromFn<(), {closure@$DIR/src/higher_order.rs:390:15: 390:43}>>>`, for any lifetime `'1`...
= note: ...but it actually implements `lender::FromLender<lender::TryShunt<'2, &mut lender::FromFn<(), {closure@$DIR/src/higher_order.rs:390:15: 390:43}>>>`, for some specific lifetime `'2`