Document MSVC intrinsic __builtin_is_implicit_lifetime (#172)

Author: GabrielDosReis

ltx/exprs.tex

@@ -1932,6 +1932,7 @@ \subsection{Monadic operators}
 	\enumerator{MsvcHasCopy}
 	\enumerator{MsvcHasAssign}
 	\enumerator{MsvcHasUserDestructor}
+	\enumerator{MsvcIsImplicitLifetime}
 
 	\setcounter{enumi}{4063}
 	\enumerator{MsvcConfusion}
@@ -2169,6 +2170,10 @@ \subsection{Monadic operators}
 Source-level ``\code{__has_user_destructor}'' operator (\sortref{MsvcHasUserDestructor}{SourceKeyword}).
 
 
+\ifcSortSection{MsvcIsImplicitLifetime}{MonadicOperator}
+Source-level ``\code{__builtin_is_implicit_lifetime}'' operator (\sortref{MsvcHasUserDestructor}{SourceKeyword}).
+
+
 \ifcSortSection{MsvcConfusion}{MonadicOperator}
 This is not a real operator, rather a sentinel value.  Monadic operator values greater than this
 have alternate representations, and signify some infelicities in the MSVC parser.  They are

ltx/words.tex

@@ -794,6 +794,7 @@ \subsubsection{\valueTag{WordSort::Keyword}}
 	\enumerator{MsvcPackCardinality}
 	\enumerator{MsvcConfusedSizeof}
 	\enumerator{MsvcConfusedAlignas}
+	\enumerator{MsvcImplicitLifetime}
 \end{Enumeration}
 
 In some circumstances, the use of a keyword (e.g. \code{new} in a \grammar{new-expression}) 
@@ -997,6 +998,7 @@ \subsubsection{\valueTag{WordSort::Keyword}}
 \ifcdoc{MsvcPackCardinality}{SourceKeyword} A reserved word for ``\code{sizeof...}''.
 \ifcdoc{MsvcConfusedSizeof}{SourceKeyword} A reserved word for ``\code{sizeof}''.
 \ifcdoc{MsvcConfusedAlignas}{SourceKeyword} A reserved word for ``\code{alignas}''.
+\ifcdoc{MsvcIsImplicitLifetime}{SourceKeyword} A reserved word for ``\code{__builtin_is_implicit_lifetime}''.