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# 0125: Unexpected return type in function

Compiler found a function's [return type](/language/functions.md#return-from-function) that wasn't expected in this position.

Function's return type is a combination of words `optional`, `logical`, primitive types such as `Int`, or `Float`, and class names.

`logical` type can't be mixes with other types:

```pascal
function foo: logical, int // Error: unexpected return type int in function foo.
```

`optional` modifier must precede the return type:

```pascal
function foo: int, optional // Error: unexpected return type int in function foo.
```

You can't return types that are not known to the compiler:

```pascal
function foo: unknown // Error: Unexpected return type unknown in function foo.
```

#### Possible solutions:

* check your function definition and provide correct order of return types.