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-# errwrap
-
-`errwrap` is a package for Go that formalizes the pattern of wrapping errors
-and checking if an error contains another error.
-
-There is a common pattern in Go of taking a returned `error` value and
-then wrapping it (such as with `fmt.Errorf`) before returning it. The problem
-with this pattern is that you completely lose the original `error` structure.
-
-Arguably the _correct_ approach is that you should make a custom structure
-implementing the `error` interface, and have the original error as a field
-on that structure, such [as this example](http://golang.org/pkg/os/#PathError).
-This is a good approach, but you have to know the entire chain of possible
-rewrapping that happens, when you might just care about one.
-
-`errwrap` formalizes this pattern (it doesn't matter what approach you use
-above) by giving a single interface for wrapping errors, checking if a specific
-error is wrapped, and extracting that error.
-
-## Installation and Docs
-
-Install using `go get github.com/hashicorp/errwrap`.
-
-Full documentation is available at
-http://godoc.org/github.com/hashicorp/errwrap
-
-## Usage
-
-#### Basic Usage
-
-Below is a very basic example of its usage:
-
-```go
-// A function that always returns an error, but wraps it, like a real
-// function might.
-func tryOpen() error {
-	_, err := os.Open("/i/dont/exist")
-	if err != nil {
-		return errwrap.Wrapf("Doesn't exist: {{err}}", err)
-	}
-
-	return nil
-}
-
-func main() {
-	err := tryOpen()
-
-	// We can use the Contains helpers to check if an error contains
-	// another error. It is safe to do this with a nil error, or with
-	// an error that doesn't even use the errwrap package.
-	if errwrap.Contains(err, "does not exist") {
-		// Do something
-	}
-	if errwrap.ContainsType(err, new(os.PathError)) {
-		// Do something
-	}
-
-	// Or we can use the associated `Get` functions to just extract
-	// a specific error. This would return nil if that specific error doesn't
-	// exist.
-	perr := errwrap.GetType(err, new(os.PathError))
-}
-```
-
-#### Custom Types
-
-If you're already making custom types that properly wrap errors, then
-you can get all the functionality of `errwraps.Contains` and such by
-implementing the `Wrapper` interface with just one function. Example:
-
-```go
-type AppError {
-  Code ErrorCode
-  Err  error
-}
-
-func (e *AppError) WrappedErrors() []error {
-  return []error{e.Err}
-}
-```
-
-Now this works:
-
-```go
-err := &AppError{Err: fmt.Errorf("an error")}
-if errwrap.ContainsType(err, fmt.Errorf("")) {
-	// This will work!
-}
-```