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@eisenwave eisenwave commented Aug 2, 2023

A relation which is asymmetric must also be irreflexive. Asymmetry is defined as:

A sequenced before B  =>  !(A sequenced before B)

If any evaluation E was sequenced before itself, this would yield:

E sequenced-before E  =>  !(E sequenced before E)
true                  =>  false

This is a contradiction of the asymmetry requirement, meaning that sequenced before is implied to be irreflexive. Ideally, this should be clearly stated, and it should be stated that it is a strict partial order since it fulfills all requirements of one.

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I initially thought that this is a core issue, but it looks to be purely editorial.

See cplusplus/CWG#387

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