Function peek_visible_in

pub fn peek_visible_in(
    db: &dyn DefsGroup,
    visibility_in_module: Visibility,
    containing_module_id: ModuleId,
    user_module_id: ModuleId,
) -> bool

Determine whether a module member is visible to user module given the visibility within it, ignoring or forgetting the visibility of the ancestors of the containing module for a moment.