# Drop redundant Err field from unsupportedVersionError

`2427edd`→[main](/content/gh/entireio/cli/commits/main/index.html)·pfleidi·3w ago·1 file·+2 added/-4 removed

The field always held the package sentinel errUnsupportedVersion and was
read only by this type's Error and Unwrap methods. Wire both to the
sentinel directly so the error carries only its per-instance context
(checkpoint ID and version). The error string and errors.Is chain are
unchanged.

## Sessions

35a0d0ce56a6View transcript

## Changes

1

- cmd/entire/cli/checkpointpolicy

- Mversion.go+2/-4

```
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return unsupportedVersionError{
			CheckpointID: checkpointID,
			Version:      version,
			Err:          errUnsupportedVersion,
		}
	}
	return nil
2 unmodified lines

type unsupportedVersionError struct {
	CheckpointID string
	Version      string
	Err          error
}

func (e unsupportedVersionError) Error() string {
	return fmt.Sprintf("checkpoint %s uses unsupported checkpoint_version %q: %v", e.CheckpointID, e.Version, e.Err)
	return fmt.Sprintf("checkpoint %s uses unsupported checkpoint_version %q: %v", e.CheckpointID, e.Version, errUnsupportedVersion)
}

func (e unsupportedVersionError) Unwrap() error {
	return e.Err
	return errUnsupportedVersion
}
```

Mcmd/entire/cli/checkpointpolicy/version.go+2/-4