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[expr.prim.lambda] Avoid decl-specifier-seq in lambda-declarator CWG2509 #2338

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[expr.prim.lambda] Avoid decl-specifier-seq in lambda-declarator CWG2509 #2338

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23 changes: 18 additions & 5 deletions source/expressions.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -1688,7 +1688,20 @@

\begin{bnf}
\nontermdef{lambda-specifiers}\br
\opt{decl-specifier-seq} \opt{noexcept-specifier} \opt{attribute-specifier-seq} \opt{trailing-return-type}
\opt{lambda-specifier-seq} \opt{noexcept-specifier} \opt{attribute-specifier-seq} \opt{trailing-return-type}
\end{bnf}

\begin{bnf}
\nontermdef{lambda-specifier}\br
\terminal{consteval}\br
\terminal{constexpr}\br
\terminal{mutable}
\end{bnf}

\begin{bnf}
\nontermdef{lambda-specifier-seq}\br
lambda-specifier\br
lambda-specifier lambda-specifier-seq
\end{bnf}

\pnum
Expand All @@ -1713,12 +1726,12 @@
\end{note}

\pnum
In the \grammarterm{decl-specifier-seq} of the \grammarterm{lambda-declarator},
each \grammarterm{decl-specifier}
shall be one of \keyword{mutable}, \keyword{constexpr}, or \keyword{consteval}.
A \grammarterm{lambda-specifier-seq} shall contain
at most one of each \grammarterm{lambda-specifier} and
shall not contain both \keyword{constexpr} and \keyword{consteval}.
If the \grammarterm{lambda-declarator} contains
an explicit object parameter\iref{dcl.fct},
then no \grammarterm{decl-specifier} in the \grammarterm{decl-specifier-seq}
then no \grammarterm{lambda-specifier} in the \grammarterm{lambda-specifier-seq}
shall be \keyword{mutable}.
\begin{note}
The trailing \grammarterm{requires-clause} is described in \ref{dcl.decl}.
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