Enable turbofish for impls

[signorecello]

Problem

Some code like this should compile:

struct MerkleTree<let N: u32> {
    root: Field,
    hasher: fn([Field; N]) -> Field,
}

impl<let N: u32> MerkleTree<N> {
    fn new(root: Field, hasher: fn([Field; N]) -> Field) -> Self {
        Self { root, hasher }
    }
}

#[test]
fn test_merkle_tree_membership() {
    let root = 0x1c59022dba1d97f63021cc5a23e4fe80f019465e0ccb54de9aa91935495354a3;
    let mt = MerkleTree::<2>::new(root, dep::std::hash::pedersen_hash);
}

But it doesn't, because MerkleTree doesn't accept turbofish

Happy Case

The above code would compile and work :)

Project Impact

None

Impact Context

No response

Workaround

None

Workaround Description

No response

Additional Context

No response

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Support Needs

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