// interface{ Error() string }
		ityp := &Interface{methods: []*Func{err}, complete: true}
		computeInterfaceTypeSet(nil, nopos, ityp) // prevent races due to lazy computation of tset

		typ.SetUnderlying(ityp)
		def(obj)
	}

	// type comparable interface{} // marked as comparable
	{
		obj := NewTypeName(nopos, nil, "comparable", nil)
		obj.setColor(black)
		typ := NewNamed(obj, nil, nil)

		// interface{ Error() string }
		ityp := &Interface{methods: []*Func{err}, complete: true}
		computeInterfaceTypeSet(nil, nopos, ityp) // prevent races due to lazy computation of tset

		typ.SetUnderlying(ityp)
		def(obj)
	}

	// type comparable interface{} // marked as comparable
	{
		obj := NewTypeName(nopos, nil, "comparable", nil)
		obj.setColor(black)
		typ := NewNamed(obj, nil, nil)

func scasetype() *types.Type {
	if scase == nil {
		n := ir.NewDeclNameAt(src.NoXPos, ir.OTYPE, ir.Pkgs.Runtime.Lookup("scase"))
		scase = types.NewNamed(n)
		n.SetType(scase)
		n.SetTypecheck(1)

		scase.SetUnderlying(types.NewStruct([]*types.Field{
			types.NewField(base.Pos, typecheck.Lookup("c"), types.Types[types.TUNSAFEPTR]),
			types.NewField(base.Pos, typecheck.Lookup("elem"), types.Types[types.TUNSAFEPTR]),
		}))
	}