# 0110: Function must return N values

Compiler found that number of values in return statement does not match [function signature](/language/functions.md#signature). It can happen if `return` has more or fewer values.

For example, if function has not declared any return type, it's incorrect to return values from it:

```pascal
function foo
  return 1 // error, `foo` should return nothing
end
```

Similarly, it is incorrect to return nothing, when the function has declared a return type:

```pascal
function bar: int
  return
end
```

#### Possible solutions:

* check a number of returned values following a `return` keyword. Make sure this number matches the number of return types declared in the function's signature
* if the function may, under some condition, return nothing ([a fallible function](/language/functions.md#optional-return-type)), its return type must be prepended with an `optional` keyword:

```pascal
function bar: optional int
  if ...
  then
    return 1
  else
   return
  end
end
```


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