Function is_fn_unsafe_to_call 

pub fn is_fn_unsafe_to_call(
    db: &(dyn HirDatabase + 'static),
    func: FunctionId,
    caller_target_features: &TargetFeatures<'_>,
    call_edition: Edition,
    target_feature_is_safe: TargetFeatureIsSafeInTarget,
) -> Unsafety