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package errors
// Causer is the type of an error that may provide an error cause for
// error diagnosis. Cause may return nil if there is no cause (for
// example because the cause has been masked).
type Causer interface {
Cause() error
}
// Wrapper is the type of an error that wraps another error. It is
// exposed so that external types may implement it, but should in
// general not be used otherwise.
type Wrapper interface {
// Message returns the top level error message,
// not including the message from the underlying
// error.
Message() string
// Underlying returns the underlying error, or nil
// if there is none.
Underlying() error
}
// Deprecated: Locationer is the old name for Locator,
// kept for backward compatibility only.
type Locationer = Locator
// Locator can be implemented by any error type that wants to expose
// the source location of an error.
type Locator interface {
// Location returns the name of the file and the line number
// associated with an error.
Location() (file string, line int)
}
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