[BUILD] Avoid buggy "should be explicitly initialized in the copy constructor" warning with gcc <= 8 #3087
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gcc <= 8, when building with -Wextra (and -Werror) wrongly raises this:
See on Compiler Explorer here: https://godbolt.org/z/ed5rv74nT
I believe Jason Merrill fixed it in gcc for all gcc >= 9 with: https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=f3f7cefecc833b4ab652215ceb8b408c21dca225;hp=777083bb806dbe31ab97002b7d445191d3ee7a2d
Workaround this by calling explicitly the empty Span constructor.