dmd/compiler/test/compilable/must_use_initialize.d

// https://issues.dlang.org/show_bug.cgi?id=23236
// can't initialize a @mustuse member in constructor

import core.attribute;

@mustuse struct MyError { }

struct S
{
    MyError lastError;

    this(int x)
    {
        this.lastError = MyError();
    }
}