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Walk: add support for go1.20 multi errors (Unwrap() []error) #18

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Walk: add support for go1.20 multi errors (Unwrap() []error) #18

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11 changes: 10 additions & 1 deletion errwrap.go
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,9 @@ type WalkFunc func(error)
// wrapped error in addition to the wrapper itself. Since all the top-level
// functions in errwrap use Walk, this means that all those functions work
// with your custom type.
//
// Note: since Go 1.20 wrappers should instead implement Unwrap() []error
// as documented in package [errors] and [errors.Join].
type Wrapper interface {
WrappedErrors() []error
}
Expand Down Expand Up @@ -150,9 +153,15 @@ func Walk(err error, cb WalkFunc) {
for _, err := range e.WrappedErrors() {
Walk(err, cb)
}
case interface{ Unwrap() error }:
case interface{ Unwrap() error }: // Go 1.13
cb(err)
Walk(e.Unwrap(), cb)
case interface{ Unwrap() []error }: // Go 1.20
cb(err)

for _, err := range e.Unwrap() {
Walk(err, cb)
}
default:
cb(err)
}
Expand Down