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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package json

import (
	"reflect"
)

// A SyntaxError is a description of a JSON syntax error.
// Unmarshal will return a SyntaxError if the JSON can't be parsed.
type SyntaxError struct {
	msg    string // description of error
	Offset int64  // error occurred after reading Offset bytes
}

func (e *SyntaxError) Error() string { return e.msg }

// A MarshalerError represents an error from calling a MarshalJSON or MarshalText method.
type MarshalerError struct {
	Type       reflect.Type
	Err        error
	sourceFunc string
}

func (e *MarshalerError) Error() string {
	srcFunc := e.sourceFunc
	if srcFunc == "" {
		srcFunc = "MarshalJSON"
	}
	return "json: error calling " + srcFunc +
		" for type " + e.Type.String() +
		": " + e.Err.Error()
}

// Unwrap returns the underlying error.
func (e *MarshalerError) Unwrap() error { return e.Err }