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30 lines
630 B
Go
30 lines
630 B
Go
// +build !go1.13
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package errors
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// Cause recursively unwraps an error chain and returns the underlying cause of
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// the error, if possible. An error value has a cause if it implements the
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// following interface:
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//
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// type causer interface {
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// Cause() error
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// }
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//
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// If the error does not implement Cause, the original error will
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// be returned. If the error is nil, nil will be returned without further
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// investigation.
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func Cause(err error) error {
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type causer interface {
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Cause() error
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}
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for err != nil {
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cause, ok := err.(causer)
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if !ok {
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break
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}
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err = cause.Cause()
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}
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return err
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}
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