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Replace remaining fold calls

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This commit is contained in:
Florian Diebold 2021-04-08 13:32:48 +02:00
parent caee3b6c2d
commit 0f058d61ce
3 changed files with 104 additions and 59 deletions
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27
crates/hir_ty/src/lib.rs
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@ -328,3 +328,30 @@ pub(crate) fn fold_free_vars<T: HasInterner<Interner = Interner> + Fold<Interner
}
t.fold_with(&mut FreeVarFolder(f), DebruijnIndex::INNERMOST).expect("fold failed unexpectedly")
}
pub(crate) fn fold_tys<T: HasInterner<Interner = Interner> + Fold<Interner>>(
t: T,
f: impl FnMut(Ty, DebruijnIndex) -> Ty,
binders: DebruijnIndex,
) -> T::Result {
use chalk_ir::{
fold::{Folder, SuperFold},
Fallible,
};
struct TyFolder<F>(F);
impl<'i, F: FnMut(Ty, DebruijnIndex) -> Ty + 'i> Folder<'i, Interner> for TyFolder<F> {
fn as_dyn(&mut self) -> &mut dyn Folder<'i, Interner> {
self
}
fn interner(&self) -> &'i Interner {
&Interner
}
fn fold_ty(&mut self, ty: Ty, outer_binder: DebruijnIndex) -> Fallible<Ty> {
let ty = ty.super_fold_with(self.as_dyn(), outer_binder)?;
Ok(self.0(ty, outer_binder))
}
}
t.fold_with(&mut TyFolder(f), binders).expect("fold failed unexpectedly")
}