}

func TestLookupFieldOrMethodOnNil(t *testing.T) {
	// LookupFieldOrMethod on a nil type is expected to produce a run-time panic.
	defer func() {
		const want = "LookupFieldOrMethod on nil type"
		p := recover()
		if s, ok := p.(string); !ok || s != want {
			t.Fatalf("got %v, want %s", p, want)
		}
	}()
	LookupFieldOrMethod(nil, false, nil, "")
}

func TestLookupFieldOrMethod(t *testing.T) {

			check.use(arg0)
			return
		}

		check.expr(nil, x, selx.X)
		if x.mode == invalid {
			return
		}

		base := derefStructPtr(x.typ)
		sel := selx.Sel.Name
		obj, index, indirect := lookupFieldOrMethod(base, false, check.pkg, sel, false)
		switch obj.(type) {
		case nil:
			check.errorf(x, MissingFieldOrMethod, invalidArg+"%s has no single field %s", base, sel)
			return
		case *Func:

		if xi != nil {
			// All xi methods must exist in y and corresponding signatures must unify.
			xmethods := xi.typeSet().methods
			for _, xm := range xmethods {
				obj, _, _ := LookupFieldOrMethod(y, false, xm.pkg, xm.name)
				if ym, _ := obj.(*Func); ym == nil || !u.nify(xm.typ, ym.typ, exact, p) {
					return false
				}
			}
			return true
		}
	}

			check.use(arg0)
			return
		}

		check.expr(nil, x, selx.X)
		if x.mode == invalid {
			return
		}

		base := derefStructPtr(x.typ)
		sel := selx.Sel.Value
		obj, index, indirect := lookupFieldOrMethod(base, false, check.pkg, sel, false)
		switch obj.(type) {
		case nil:
			check.errorf(x, MissingFieldOrMethod, invalidArg+"%s has no single field %s", base, sel)
			return
		case *Func:

		if xi != nil {
			// All xi methods must exist in y and corresponding signatures must unify.
			xmethods := xi.typeSet().methods
			for _, xm := range xmethods {
				obj, _, _ := LookupFieldOrMethod(y, false, xm.pkg, xm.name)
				if ym, _ := obj.(*Func); ym == nil || !u.nify(xm.typ, ym.typ, exact, p) {
					return false
				}
			}
			return true
		}
	}