squash merge from dev branch

vendor/go.uber.org/multierr/example_test.go

@@ -0,0 +1,72 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package multierr_test
+
+import (
+	"errors"
+	"fmt"
+
+	"go.uber.org/multierr"
+)
+
+func ExampleCombine() {
+	err := multierr.Combine(
+		errors.New("call 1 failed"),
+		nil, // successful request
+		errors.New("call 3 failed"),
+		nil, // successful request
+		errors.New("call 5 failed"),
+	)
+	fmt.Printf("%+v", err)
+	// Output:
+	// the following errors occurred:
+	//  -  call 1 failed
+	//  -  call 3 failed
+	//  -  call 5 failed
+}
+
+func ExampleAppend() {
+	var err error
+	err = multierr.Append(err, errors.New("call 1 failed"))
+	err = multierr.Append(err, errors.New("call 2 failed"))
+	fmt.Println(err)
+	// Output:
+	// call 1 failed; call 2 failed
+}
+
+func ExampleErrors() {
+	err := multierr.Combine(
+		nil, // successful request
+		errors.New("call 2 failed"),
+		errors.New("call 3 failed"),
+	)
+	err = multierr.Append(err, nil) // successful request
+	err = multierr.Append(err, errors.New("call 5 failed"))
+
+	errors := multierr.Errors(err)
+	for _, err := range errors {
+		fmt.Println(err)
+	}
+	// Output:
+	// call 2 failed
+	// call 3 failed
+	// call 5 failed
+}