\item[@"decls"] A code fragment containing declarations to be inserted at the
head of the effective method body. The default is to insert nothing.
\item[@"before"] A code fragment containing initialization to be performed at
the beginning of the effective method body. The default is to insert
nothing.
\item[@"decls"] A code fragment containing declarations to be inserted at the
head of the effective method body. The default is to insert nothing.
\item[@"before"] A code fragment containing initialization to be performed at
the beginning of the effective method body. The default is to insert
nothing.