[NF] Add missing cases to Expression.compare.

Belonging to [master]:
  - #2820

Author: perost

Compiler/NFFrontEnd/NFExpression.mo

@@ -431,6 +431,7 @@ public
         Call c;
         list<Subscript> subs;
         ClockKind clk1, clk2;
+        Mutable<Expression> me;
 
       case INTEGER()
         algorithm
@@ -511,6 +512,13 @@ public
         then
           compareList(exp1.elements, expl);
 
+      case RECORD()
+        algorithm
+          RECORD(path = p, elements = expl) := exp2;
+          comp := Absyn.pathCompare(exp1.path, p);
+        then
+          if comp == 0 then compareList(exp1.elements, expl) else comp;
+
       case CALL()
         algorithm
           CALL(call = c) := exp2;
@@ -651,6 +659,24 @@ public
         then
           comp;
 
+      case BOX()
+        algorithm
+          BOX(exp = e2) := exp2;
+        then
+          compare(exp1.exp, e2);
+
+      case MUTABLE()
+        algorithm
+          MUTABLE(exp = me) := exp2;
+        then
+          compare(Mutable.access(exp1.exp), Mutable.access(me));
+
+      case EMPTY()
+        algorithm
+          EMPTY(ty = ty) := exp2;
+        then
+          valueCompare(exp1.ty, ty);
+
       else
         algorithm
           Error.assertion(false, getInstanceName() + " got unknown expression.", sourceInfo());