- Avoid overly optimistic switch-optimization

git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@9473 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

Author: sjoelund

Compiler/FrontEnd/Patternm.mo

@@ -749,7 +749,9 @@ algorithm
         ix = findMinMod(ixs,1);
       then (DAE.ET_STRING(),ix);
     case ({},_,_,_) then (ty,0);
-    case ({_},_,_,1) then (ty,0);
+    // Sadly, we cannot switch a default uniontype as the previous case in not guaranteed
+    // to succeed matching if it matches for subpatterns.
+    case ({_},_,DAE.ET_INT(),1) then (ty,0);
   end match;
 end findPatternToConvertToSwitch2;