Issue 166644
Summary [-Wunsafe-buffer-usage] Warn about two-arg string view constructors
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Reporter tsepez
    The two-arg form of std::span<> will currently produce a warning when used along with the -Wunsafe-buffer-usage-in-container option, subject to heuristics that try to determine suspicious arguments.

The string view types, (actually std::basic_string_view<>) have the same issues as does std::span<> when used with a two-argument constructor.

Since the name of the -W flag says "container", I humbly propose covering this case under the same warning, and produce the same waring when encountered.  

A small task is removing the specific mention of std::span<> from the diagnostic, expanding it to imply other containers.

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