Address makeindex warnings

chapters/classes.tex

@@ -202,7 +202,7 @@ \subsection{Component Declaration Static Semantics}\label{component-declaration-
 
 \subsubsection{Declaration Equations}\label{declaration-equations}
 
-An environment that defines the value of a component of built-in type is said to define a \firstuse{declaration equation}\index{declaration equation}\index{declaration equation|seealso{binding equation}} associated with the declared component.
+An environment that defines the value of a component of built-in type is said to define a \firstuse{declaration equation}\index{declaration equation}\index{declaration equation!zzzzz@\igobble |seealso{binding equation}} associated with the declared component.
 % Note: In variability-of-expressions, it's called a "binding equation", not "declaration equation".
 The declaration equation is of the form \lstinline!x = expression! defined by a component declaration, where \lstinline!expression! must not have higher variability than the declared component \lstinline!x! (see \cref{variability-of-expressions}).
 Unlike other equations, a declaration equation can be overridden (replaced or removed) by an element modification.

chapters/synchronous.tex

@@ -813,7 +813,7 @@ \subsection{Sub-clock conversion operators}\label{sub-clock-conversion-operators
 
 \section{Clocked When-Clause}\label{clocked-when-clause}
 
-In addition to the previously discussed conditional \lstinline!when!-clause, a \emph{clocked} \lstinline!when!-clause\index{clocked!\lstinline!when!-clause}\index{\lstinline!when!-clause!clocked} is introduced:
+In addition to the previously discussed conditional \lstinline!when!-clause, a \emph{clocked} \lstinline!when!-clause\index{clocked!when-clause@\robustinline{when}-clause}\index{when-clause@\robustinline{when}-clause!clocked} is introduced:
 % TODO: Can't have angle brackets and \emph in the same mathescape due to LaTeXML issue:
 % - https://github.com/brucemiller/LaTeXML/issues/1477
 % Once we cut the MathJax dependency, change to single mathescape for better character spacing.

preamble.tex

@@ -88,6 +88,10 @@
 \fi
 \makeindex
 
+% For solving issue with see-also entries in index, see
+% - https://tex.stackexchange.com/questions/231840/what-is-the-proper-use-of-several-seealso-in-the-same-index-entry-with-makeinde
+\def\igobble#1 {}
+
 % Providing command that other authors seem to take for granted.
 \newcommand*\seealso[2]{\emph{\alsoname} #1}