[Bug libstdc++/87641] std::valarray::sum() fails for types where T() is not a neutral element for addition

[frederic.jardon at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87641

--- Comment #1 from Frederic Jardon <frederic.jardon at gmail dot com> ---
Created attachment 44852
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44852&action=edit
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