Function rustc_middle::ty::suggest_constraining_type_param

pub fn suggest_constraining_type_param(
    tcx: TyCtxt<'_>, 
    generics: &Generics<'_>, 
    err: &mut DiagnosticBuilder<'_>, 
    param_name: &str, 
    constraint: &str, 
    def_id: Option<DefId>
) -> bool

Suggest restricting a type param with a new bound.