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[expr.prim.req] Fix uses of 'unevaluated operand' #4832

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[expr.prim.req] Fix uses of 'unevaluated operand' #4832

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12 changes: 7 additions & 5 deletions source/expressions.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -2694,8 +2694,6 @@
\pnum
A \grammarterm{requires-expression} is a prvalue of type \tcode{bool}
whose value is described below.
Expressions appearing within a \grammarterm{requirement-body}
are unevaluated operands\iref{term.unevaluated.operand}.

\pnum
\begin{example}
Expand Down Expand Up @@ -2779,6 +2777,7 @@
\pnum
A \grammarterm{simple-requirement} asserts
the validity of an \grammarterm{expression}.
The \grammarterm{expression} is an unevaluated operand\iref{expr.context}.
\begin{note}
The enclosing \grammarterm{requires-expression} will evaluate to \keyword{false}
if substitution of template arguments into the \grammarterm{expression} fails.
Expand Down Expand Up @@ -2848,7 +2847,9 @@

\pnum
A \grammarterm{compound-requirement} asserts properties
of the \grammarterm{expression} $E$. Substitution
of the \grammarterm{expression} $E$.
The \grammarterm{expression} is an unevaluated operand\iref{expr.context}.
Substitution
of template arguments (if any) and verification of
semantic properties proceed in the following order:

Expand Down Expand Up @@ -2957,8 +2958,9 @@
\end{example}

\pnum
A local parameter shall only appear as an unevaluated operand\iref{term.unevaluated.operand}
within the \grammarterm{constraint-expression}.
Within the \grammarterm{constraint-expression},
an \grammarterm{unqualified-id} naming a local parameter shall not be
potentially evaluated\iref{basic.def.odr}.
\begin{example}
\begin{codeblock}
template<typename T> concept C = requires (T a) {
Expand Down