Support Go 1.20 Unwrap() []error#69
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Go 1.20 includes native support for wrapping multiple errors.
Errors which wrap multiple other errors must implement,
Unwrap() []error
If an error implements this method, `errors.Is` and `errors.As`
will descend into the list and continue matching.
Versions of Go prior to 1.20, however, still need the old
`Is` and `As` method implementations on the error object
to get a similar behavior.
This change adds the `Unwrap() []error` method
gated by a build constraint requiring Go 1.20 or higher.
It similarly moves the existing `Is` and `As` methods
to a file that is ignored on Go 1.20 or higher.
Once Go 1.21 is released and 1.19 is no longer supported,
the pre-go1.20 file may be deleted and the build constraints removed.
For details, see also the section,
"How should existing multierror types adopt the new interface?"
of the [multiple errors proposal][1].
[1]: golang/go#53435
Codecov Report
@@ Coverage Diff @@
## master #69 +/- ##
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Coverage 100.00% 100.00%
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Files 1 3 +2
Lines 109 110 +1
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+ Hits 109 110 +1
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r-hang
approved these changes
Feb 10, 2023
r-hang
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Thank you for the contribution! lgtm!
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Go 1.20 includes native support for wrapping multiple errors.
Errors which wrap multiple other errors must implement,
If an error implements this method,
errors.Isanderrors.Aswill descend into the list and continue matching.
Versions of Go prior to 1.20, however, still need the old
IsandAsmethod implementations on the error objectto get a similar behavior.
This change adds the
Unwrap() []errormethodgated by a build constraint requiring Go 1.20 or higher.
It similarly moves the existing
IsandAsmethodsto a file that is ignored on Go 1.20 or higher.
Once Go 1.21 is released and 1.19 is no longer supported,
the pre-go1.20 file may be deleted and the build constraints removed.
For details, see also the section,
"How should existing multierror types adopt the new interface?"
of the multiple errors proposal.
Refs #64