https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100384

            Bug ID: 100384
           Summary: Compiling in c++17 mode breaks compilation of
                    functions named visit()
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: aacid at kde dot org
  Target Milestone: ---

Created attachment 50733
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50733&action=edit
main.cpp

The attached code fails to compile with 

g++ --std=c++17 main.cpp 

I've tried with gcc 11.1 too and it fails too.

To me it seems a bug in the implementation in which std::visit is leaking into
the non std:: namespace, but maybe it's a bug in C++ specification?

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