https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88897

--- Comment #1 from Rafael Avila de Espindola <rafael at espindo dot la> ---
Created attachment 45453
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45453&action=edit
reduced the test a bit more

It now compiles with older gcc too.

The warning is there in gcc 7, but not gcc 6.

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