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use crate::*;
impl<I: Interner> Fold<I> for FnPointer<I> {
type Result = FnPointer<I>;
fn fold_with<'i>(
self,
folder: &mut dyn Folder<'i, I>,
outer_binder: DebruijnIndex,
) -> Fallible<Self::Result>
where
I: 'i,
{
let FnPointer {
num_binders,
substitution,
sig,
} = self;
Ok(FnPointer {
num_binders,
substitution: substitution.fold_with(folder, outer_binder.shifted_in())?,
sig: FnSig {
abi: sig.abi,
safety: sig.safety,
variadic: sig.variadic,
},
})
}
}
impl<T, I: Interner> Fold<I> for Binders<T>
where
T: HasInterner<Interner = I> + Fold<I>,
<T as Fold<I>>::Result: HasInterner<Interner = I>,
I: Interner,
{
type Result = Binders<T::Result>;
fn fold_with<'i>(
self,
folder: &mut dyn Folder<'i, I>,
outer_binder: DebruijnIndex,
) -> Fallible<Self::Result>
where
I: 'i,
{
let Binders {
binders: self_binders,
value: self_value,
} = self;
let value = self_value.fold_with(folder, outer_binder.shifted_in())?;
let binders = VariableKinds {
interned: self_binders.interned().clone(),
};
Ok(Binders::new(binders, value))
}
}
impl<I, T> Fold<I> for Canonical<T>
where
I: Interner,
T: HasInterner<Interner = I> + Fold<I>,
<T as Fold<I>>::Result: HasInterner<Interner = I>,
{
type Result = Canonical<T::Result>;
fn fold_with<'i>(
self,
folder: &mut dyn Folder<'i, I>,
outer_binder: DebruijnIndex,
) -> Fallible<Self::Result>
where
I: 'i,
{
let Canonical {
binders: self_binders,
value: self_value,
} = self;
let value = self_value.fold_with(folder, outer_binder.shifted_in())?;
let binders = CanonicalVarKinds {
interned: self_binders.interned().clone(),
};
Ok(Canonical { binders, value })
}
}