Error code E0130

A pattern was declared as an argument in a foreign function declaration.

Erroneous code example:

extern "C" {
    fn foo((a, b): (u32, u32)); // error: patterns aren't allowed in foreign
                                //        function declarations
}

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To fix this error, replace the pattern argument with a regular one. Example:

struct SomeStruct {
    a: u32,
    b: u32,
}

extern "C" {
    fn foo(s: SomeStruct); // ok!
}

Run

Or:

extern "C" {
    fn foo(a: (u32, u32)); // ok!
}

Run

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