Rejection of self-referential closure signature in new solver due to lack of eager norm #191

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compiler-errors opened this issue Apr 29, 2025 · 0 comments

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compiler-errors commented Apr 29, 2025 •

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This affects polars

trait Indir<T>: FnOnce(T) -> Self::Ret {
    type Ret;
}
impl<F, T, R> Indir<T> for F where F: FnOnce(T) -> R {
    type Ret = R;
}

trait Mirror {
    type Assoc<'a>;
}

fn needs<T: Mirror>(_: impl for<'a> Indir<T::Assoc<'a>>) {}

fn test<T>() where for<'a> T: Mirror<Assoc<'a> = i32> {
    needs::<T>(|x| { x.to_string(); });
}

lcnr added the from-crater label

lcnr added this to -Znext-solver=globally

github-project-automation bot moved this to unknown in -Znext-solver=globally

compiler-errors self-assigned this

lcnr moved this from unknown to todo in -Znext-solver=globally

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