In the C++ Standard (9.6 Structured binding declarations, p.#1) there is written:
 
If the assignment-expression in the initializer has array type A and no ref-qualifier is present, e is defined by
 
attribute-specifier-seqopt S cv A e ;
 
and then
 
Otherwise, e is defined as-if by
 
attribute-specifier-seqopt decl-specifier-seq ref-qualifieropt e initializer ;
 
Should ref_qualifier be mandatory (instead of optional) in the second case?
 
With best regards
(Vlad from Moscow)
 
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