Function ra_ap_syntax::algo::ancestors_at_offset

pub fn ancestors_at_offset(
    node: &SyntaxNode, 
    offset: TextSize
) -> impl Iterator<Item = SyntaxNode>

Returns ancestors of the node at the offset, sorted by length. This should do the right thing at an edge, e.g. when searching for expressions at { $0foo } we will get the name reference instead of the whole block, which we would get if we just did find_token_at_offset(...).flat_map(|t| t.parent().ancestors()).