variant,tuple: fix/silence misc warnings #564
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variant,tuple: fix/silence misc warnings
msvc:
https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/c5267
Similar to neighboring C4625
Fix for warnings (errors in /WX mode) like
.../variant.h(759): warning C5267: definition of implicit copy constructor for '...' is deprecated because it has a user-provided destructor
(ditto for tuple).
Also fix for -Wunused-parameter in variant.h (
visit_throw_bad_variant_access
)