[NF] Various fixes.

- Changed ExpandExp.expandCref to return an array with the same
  dimensions as the input cref, even when the cref's type has
  zero-dimensions.
- Added case for Expression.TYPENAME in Expression.typeOf.
- Added better error checking when deducing unknown dimensions.
- Added check for negative dimension sizes.

Belonging to [master]:
  - #130
  - OpenModelica/OMCompiler#3042

Compiler/NFFrontEnd/NFExpandExp.mo

@@ -121,7 +121,7 @@ public
       case Expression.CREF(cref = ComponentRef.CREF())
         algorithm
           if Type.hasZeroDimension(crefExp.ty) then
-            arrayExp := Expression.makeEmptyArray(Type.ARRAY(Type.arrayElementType(crefExp.ty), {Dimension.fromInteger(0)}));
+            arrayExp := Expression.makeEmptyArray(crefExp.ty);
             expanded := true;
           elseif Type.hasKnownSize(crefExp.ty) then
             subs := expandCref2(crefExp.cref);

Compiler/NFFrontEnd/NFExpression.mo

@@ -778,6 +778,7 @@ public
       case ENUM_LITERAL()    then exp.ty;
       case CLKCONST()        then Type.CLOCK();
       case CREF()            then exp.ty;
+      case TYPENAME()        then exp.ty;
       case ARRAY()           then exp.ty;
       case RANGE()           then exp.ty;
       case TUPLE()           then exp.ty;

Compiler/NFFrontEnd/NFTyping.mo

@@ -522,6 +522,7 @@ algorithm
       Dimension dim;
       Binding b;
       Type ty;
+      TypingError ty_err;
 
     // Print an error when a dimension that's currently being processed is
     // found, which indicates a dependency loop. Another way of handling this
@@ -608,7 +609,7 @@ algorithm
           end if;
         end if;
 
-        dim := match b
+        (dim, ty_err) := match b
           // Print an error if there's no binding.
           case Binding.UNBOUND()
             algorithm
@@ -621,18 +622,25 @@ algorithm
           // to get the dimension we're looking for.
           case Binding.UNTYPED_BINDING()
             algorithm
-              dim := typeExpDim(b.bindingExp, index + Binding.countPropagatedDims(b),
-                ExpOrigin.setFlag(origin, ExpOrigin.DIMENSION), info);
+              (dim, _, ty_err) := typeExpDim(b.bindingExp, index + Binding.countPropagatedDims(b),
+                                             ExpOrigin.setFlag(origin, ExpOrigin.DIMENSION), info);
             then
-              dim;
+              (dim, ty_err);
 
           // A typed binding, get the dimension from the binding's type.
           case Binding.TYPED_BINDING()
+            then nthDimensionBoundsChecked(b.bindingType, index + Binding.countPropagatedDims(b));
+        end match;
+
+        () := match ty_err
+          case TypingError.OUT_OF_BOUNDS()
             algorithm
-              dim := nthDimensionBoundsChecked(b.bindingType, index + Binding.countPropagatedDims(b));
+              Error.addSourceMessage(Error.DIMENSION_DEDUCTION_FROM_BINDING_FAILURE,
+                {String(index), InstNode.name(component), Binding.toString(b)}, info);
             then
-              dim;
+              fail();
 
+          else ();
         end match;
 
         // Make sure the dimension is constant evaluted, and also mark it as structural.
@@ -644,6 +652,12 @@ algorithm
             then
               Dimension.fromExp(exp, dim.var);
 
+          case Dimension.UNKNOWN()
+            algorithm
+              Error.addInternalError(getInstanceName() + " returned unknown dimension in a non-function context", info);
+            then
+              fail();
+
           else dim;
         end match;
 
@@ -654,8 +668,31 @@ algorithm
     // Other kinds of dimensions are already typed.
     else dimension;
   end match;
+
+  verifyDimension(dimension, component, info);
 end typeDimension;
 
+function verifyDimension
+  input Dimension dimension;
+  input InstNode component;
+  input SourceInfo info;
+algorithm
+  () := match dimension
+    case Dimension.INTEGER()
+      algorithm
+        // Check that integer dimensions are not negative.
+        if dimension.size < 0 then
+          Error.addSourceMessage(Error.NEGATIVE_DIMENSION_INDEX,
+            {String(dimension.size), InstNode.name(component)}, info);
+          fail();
+        end if;
+      then
+        ();
+
+    else ();
+  end match;
+end verifyDimension;
+
 function getRecordElementBinding
   "Tries to fetch the binding for a given record field by using the binding of
    the record instance."
@@ -1885,13 +1922,6 @@ algorithm
     case Expression.SIZE()
       algorithm
         (exp, exp_ty, _) := typeExp(sizeExp.exp, next_origin, info);
-
-        // The first argument must be an array of any type.
-        if not Type.isArray(exp_ty) then
-          Error.addSourceMessage(Error.INVALID_ARGUMENT_TYPE_FIRST_ARRAY, {"size"}, info);
-          fail();
-        end if;
-
         sizeType := Type.sizeType(exp_ty);
       then
         (Expression.SIZE(exp, NONE()), sizeType, Variability.PARAMETER);

Compiler/Util/Error.mo

@@ -827,6 +827,8 @@ public constant Message INST_RECURSION_LIMIT_REACHED = MESSAGE(349, TRANSLATION(
   Util.gettext("Recursion limit reached while instantiating ‘%s‘."));
 public constant Message WHEN_IF_VARIABLE_MISMATCH = MESSAGE(350, TRANSLATION(), ERROR(),
   Util.gettext("The branches of an if-equation inside a when-equation must have the same set of component references on the left-hand side."));
+public constant Message DIMENSION_DEDUCTION_FROM_BINDING_FAILURE = MESSAGE(351, TRANSLATION(), ERROR(),
+  Util.gettext("Dimension %s of ‘%s‘ could not be deduced from the component's binding equation ‘%s‘."));
 public constant Message INITIALIZATION_NOT_FULLY_SPECIFIED = MESSAGE(496, TRANSLATION(), WARNING(),
   Util.gettext("The initial conditions are not fully specified. %s."));
 public constant Message INITIALIZATION_OVER_SPECIFIED = MESSAGE(497, TRANSLATION(), WARNING(),