cplusplus / cplusplus/draft

[expr.prim.req.nested] misuse of term "unevaluated operand"

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@jensmaurer is already working on this.

Since Aug 20, 2021.

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Description

[expr.prim.req.nested]p2: "A local parameter shall only appear as an unevaluated operand (7.2) within the constraint-expression."

This allows requires (T a) { requires sizeof(a) == 4; } but does not allow requires (T a) { requires sizeof(f(a)) == 4; }, because the term "unevaluated operand" only applies to the immediate operand of various contexts. I believe the intent here is "An unqualified-id naming a local parameter shall not be potentially evaluated." or similar.

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