gno.land/p/nym-moultest123/errs

Combine several errors into one. A port of the core of uber-go/multierr (MIT), trimmed to what gno needs.

1func Combine(errs ...error) error   // nil, the single error, or a *multiError
2func Errors(err error) []error      // unwrap back to the flat list

Combine has three behaviours worth knowing, because they are what make it safe to call unconditionally:

• all inputs nil gives nil, so if err := errs.Combine(...); err != nil works as written;
• exactly one non-nil input is returned as itself, not wrapped, so a type assertion or errors.Is upstream still matches;
• nested *multiError inputs are flattened, so combining in a loop does not build a tree.

The combined error prints two ways: Error() gives one line with ; between messages (for logs and panics), String() gives one error per line (for a Render block).

1err1 := doSomething()
2err2 := doSomethingElse()
3if err := errs.Combine(err1, err2); err != nil {
4	return err
5}

Part of moul/gno-contracts — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage.

⚠️ Disclaimer: provided as-is, without warranty; not security-audited. Full disclaimer: DISCLAIMER.