Function rustc_trait_selection::traits::error_reporting::suggestions::suggest_trait_object_return_type_alternatives

pub(in traits::error_reporting::suggestions) fn suggest_trait_object_return_type_alternatives(
    err: &mut DiagnosticBuilder<'_>, 
    ret_ty: Span, 
    trait_obj: &str, 
    is_object_safe: bool
)