[Issue 12242] conflict error with public imports

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12242

--- Comment #7 from Kenji Hara <k.hara.pg at gmail.com> ---
One more test case of this issue:

module test01;

private mixin template MixTmp(T, int x)
{
    template foo(U) if (is(U == T))
    {
        enum foo = x;
    }
}

mixin MixTmp!(int,  1);
mixin MixTmp!(long, 2);

------------

module test02;

private mixin template MixTmp(T, int x)
{
    template foo(U) if (is(U == T))
    {
        enum foo = x;
    }
}

mixin MixTmp!(float, 3);
mixin MixTmp!(real,  4);


------------

import test01, test02;
import std.stdio;

void main()
{
    writeln( foo!int );
}

In module test01 and test02, 'foo' make individual overload sets. And in module
test03, the imported two overload sets 'foo' should be merged to a new overload
set 'foo' which contains four mixed-in templates.

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