Clean up whitespace in listing related to pure functions

chapters/functions.tex

@@ -380,15 +380,15 @@ \section{Pure Modelica Functions}\label{pure-modelica-functions}
 
 Examples of restrictions on optimizing pure functions:
 \begin{lstlisting}[language=modelica]
-  Real x=if noEvent(abs(x))<1 then asin(x)  else 0; // May not move asin(x) out of then
+  Real x = if noEvent(abs(x)) < 1 then asin(x) else 0; // May not move asin(x) out of then
 algorithm
   assertCheck(p, T); // Must call function
 algorithm
   if b then
-    y:=2*someOtherFunction(x);
+    y := 2 * someOtherFunction(x);
   end if;
-  y:=y+asin(x);
-  y:=y+someOtherFunction(x);
+  y := y + asin(x);
+  y := y + someOtherFunction(x);
   // May not evaluate someOtherFunction(x) before asin(x) - unless b is true
   // The reason is that asin(x) may fail and someOtherFunction may hang,
   // and it might be possible to recover from this error.