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// +build go1.13 |
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package errors |
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import ( |
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stderrors "errors" |
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) |
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// Is reports whether any error in err's chain matches target. |
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// |
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// The chain consists of err itself followed by the sequence of errors obtained by |
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// repeatedly calling Unwrap. |
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// |
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// An error is considered to match a target if it is equal to that target or if |
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// it implements a method Is(error) bool such that Is(target) returns true. |
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func Is(err, target error) bool { return stderrors.Is(err, target) } |
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// As finds the first error in err's chain that matches target, and if so, sets |
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// target to that error value and returns true. |
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// |
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// The chain consists of err itself followed by the sequence of errors obtained by |
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// repeatedly calling Unwrap. |
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// |
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// An error matches target if the error's concrete value is assignable to the value |
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// pointed to by target, or if the error has a method As(interface{}) bool such that |
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// As(target) returns true. In the latter case, the As method is responsible for |
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// setting target. |
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// |
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// As will panic if target is not a non-nil pointer to either a type that implements |
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// error, or to any interface type. As returns false if err is nil. |
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func As(err error, target interface{}) bool { return stderrors.As(err, target) } |
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// Unwrap returns the result of calling the Unwrap method on err, if err's |
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// type contains an Unwrap method returning error. |
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// Otherwise, Unwrap returns nil. |
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func Unwrap(err error) error { |
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return stderrors.Unwrap(err) |
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} |