MarshalDirectiveException : Method's type signature is not PInvoke compatible.

Well, i'm having troubles with FFI on netcoreapp2 vs all good on netcoreapp3

[DllImport(LIB_NAME, CharSet = CharSet.Ansi)]
public static extern FFIExecResult ffi_exec_expr(FFIExpressionHandle ptr, FFIIdentifierKeyValue[] identifier_values, UIntPtr identifier_values_len);

I narrowed the problem to the function return type :

[StructLayout(LayoutKind.Sequential)]
internal unsafe struct FFIExecResult
{
    [MarshalAs(UnmanagedType.I1)]
    public bool is_error;
    public IntPtr content;

    public FFIStringHandle GetContent() => new FFIStringHandle(content);
}

Is there some other way to hack through this on netcore2 ?

jrouaix / csharp-expr-rs

MarshalDirectiveException : Method's type signature is not PInvoke compatible. #2