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public object Field1;
public int Field2;
public static void Main()
var a = new Data();
a.Field1 = new object();
Expected result: TypeLoadException: Could not load type Test.Data' from assembly 'Test, Version=188.8.131.52, Culture=neutral, PublicKeyToken=null' because it contains an object field at offset 0 that is incorrectly aligned or overlapped by a non-object field.
Actual result: Code runs and prints an integer which is probably object's address
By default mono does not verify that assemblies are correct.
Run mono with the --verify-all option to get (the admittedly bad) error message:
System.TypeLoadException: Error verifying Program:Main (): Could not load type .Data at 0x0000
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeLoadException: Error verifying Program:Main (): Could not load type .Data at 0x0000