https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104078

            Bug ID: 104078
           Summary: Some type determination weirdness
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: linux at carewolf dot com
  Target Milestone: ---

In an attempt to compile Qt and specifically Qt WebEngine with latest gcc 12
from git today, I git the follow weird error, from Skia inside Chromium inside
QtWebengine:

./../../../../../qtwebengine/src/3rdparty/chromium/third_party/skia/src/gpu/GrRefCnt.h:173:73:
error: ‘‘dependent_operator_type’ not supported by dump_type<type error>’ is
not a valid type for a template non-type parameter
  173 |         gr_sp<T, &T::addCommandBufferUsage,
&T::removeCommandBufferUsage>;
      |                                                                        
^
../../../../../../qtwebengine/src/3rdparty/chromium/third_party/skia/src/gpu/GrRefCnt.h:173:73:
error: ‘‘dependent_operator_type’ not supported by dump_type<type error>’ is
not a valid type for a template non-type parameter

The error triggers in C++17 mode only, and the file compiles fine in C++20 mode
(and in c++17 mode on older gccs, and clang and msvc, etc).

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