[expr.const] Check the result object of a prvalue #6267
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A prvalue may not have a result object, at least in the scalar case. |
Although temporary materialization doesn't happen in some cases, I think it's harmless to require the result object for the purpose of checking whether the prvalue is a constant expression. |
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Rebased & force-pushed. @jensmaurer @tkoeppe |
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Fixes #5422.
The remain issue (modulo CWG2558) is that we shouldn't imply a prvalue is an object, which is not true since C++17.