[structure.specification] p3 add note for "Mandates" item #2382
Description
Saying that it is expressly unspecified whether the "ill-formedness" is in the immediate context or not, i.e. is SFINAE-able or not.
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Saying that it is expressly unspecified whether the "ill-formedness" is in the immediate context or not, i.e. is SFINAE-able or not.