# `gno.land/p/nym-moultest123/errs`

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

```go
func Combine(errs ...error) error   // nil, the single error, or a *multiError
func 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).

```go
err1 := doSomething()
err2 := doSomethingElse()
if err := errs.Combine(err1, err2); err != nil {
	return err
}
```

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---

Part of **[moul/gno-contracts](https://github.com/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](https://github.com/moul/gno-contracts/blob/main/DISCLAIMER.md).

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