P2042¶

Code: P2042
Message: Return type is not declared

This error occurs when a function or method declares a return type that has not been declared.

The return type decides how much storage the result needs and which operations a caller may apply to it. Without a declaration, the compiler cannot know either, so it reports the name here rather than letting every call site fail with a less specific error. A misspelled type name, or a type that lives in a file that is not part of the project, are the usual causes.

Example¶

The following code will generate error P2042:

FUNCTION GetMode : E_Mode  (* Error: E_Mode is not declared *)
    GetMode := 0;
END_FUNCTION

The function GetMode returns E_Mode, but no type with that name has been declared.

To fix this error, declare the type:

TYPE
    E_Mode : (Idle, Running);
END_TYPE

FUNCTION GetMode : E_Mode  (* Correct: E_Mode is declared *)
    GetMode := Idle;
END_FUNCTION

Alternatively, return a built-in type:

FUNCTION GetMode : INT  (* Correct: INT is a built-in type *)
    GetMode := 0;
END_FUNCTION

P2042¶

Example¶

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