[Issue 20025] New: alias this combined with a copy constructor seems to lead to undefined behaviour.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20025

          Issue ID: 20025
           Summary: alias this combined with a copy constructor seems to
                    lead to undefined behaviour.
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: big.friendian at gmail.com

Running the following code prints a random integer every time. If the copy
constructor is removed, the code functions as expected (prints '77').

import std.stdio;

struct B
{
        static int value = 77;
        alias value this;

        this(ref return scope inout B rhs) inout { }
}

void test(int x)
{
        writefln("x: %s", x);
}

int main()
{
        B b;
        test(b);

        return 0;
}

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