# E0069

Warning name: `declaration_implemented`

Declaration is already implemented.

This warning is emitted when a `declare` item already has a matching
implementation in the same package. At that point the declaration is redundant:
the implementation itself is enough for the compiler to know the API.

This warning is useful when declarations were added during a refactor and should
be removed after the implementation has landed.

## Erroneous example

```{literalinclude} /sources/error_codes/0069_error/top.mbt
:language: moonbit
```

## Suggestion

Remove the redundant declaration and keep the implementation:

```{literalinclude} /sources/error_codes/0069_fixed/top.mbt
:language: moonbit
```