[Bug c++/105841] New: Change in behavior of CTAD for alias templates

[avemilia at protonmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105841

            Bug ID: 105841
           Summary: Change in behavior of CTAD for alias templates
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: avemilia at protonmail dot com
  Target Milestone: ---

Created attachment 53080
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53080&action=edit
repro

Since GCC 12, this code does not compile: https://godbolt.org/z/sWvh7P4co
The code used to compile on GCC 10 and 11. If this is incorrect code, please
explain what is wrong.