[Issue 21073] New: Rebindable does not work when class has alias this to inout property

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21073

          Issue ID: 21073
           Summary: Rebindable does not work when class has alias this to
                    inout property
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: freeslave93 at gmail.com

import std.typecons;

class Internal
{
}

class Class
{
    inout(Internal) internal() inout {
        return _internal;
    }
    alias internal this;
    Internal _internal;
}

void main(string[] args)
{
    const c = new Class;
    auto r = c.rebindable;
}

When compiling with dmd (2.093.0) it reports the error:

/usr/include/dmd/phobos/std/typecons.d(2173): Error: pure function
std.typecons.Rebindable!(const(Class)).Rebindable.RebindableCommon!(const(Class),
Class, Rebindable!(const(Class))).opAssign cannot call impure delegate
std.typecons.Rebindable!(const(Class)).Rebindable.RebindableCommon!(const(Class),
Class, Rebindable!(const(Class))).opAssign.__lambda2
/usr/include/dmd/phobos/std/typecons.d(2173): Error: @nogc function
std.typecons.Rebindable!(const(Class)).Rebindable.RebindableCommon!(const(Class),
Class, Rebindable!(const(Class))).opAssign cannot call non- at nogc delegate
std.typecons.Rebindable!(const(Class)).Rebindable.RebindableCommon!(const(Class),
Class, Rebindable!(const(Class))).opAssign.__lambda2
main.d(20): Error: template instance std.typecons.rebindable!(const(Class))
error instantiating

This code was compilable on dmd 2.083.
Current workaround is to add 'pure' attribute to 'internal' method.

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