On 12/03/2022 14:47, Vladimir Grigoriev via Std-Discussion wrote:
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> In the C++ Standard (9.6 Structured binding declarations, p.#1) there is written:
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> If the assignment-expression in the initializer has array type A and no ref-qualifier is present, e is defined by
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> attribute-specifier-seqopt S cv A e ;
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> and then
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> Otherwise, e is defined as-if by
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> attribute-specifier-seqopt decl-specifier-seq ref-qualifieropt e initializer ;
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> Should ref_qualifier be mandatory (instead of optional) in the second case?

There are two conditions after «If». «Otherwise» part is applied when either (or both) of them is false.