[NF] Add type checking for reductions.

Belonging to [master]:
  - #2881
  - OpenModelica/OpenModelica-testsuite#1107

Author: perost

Compiler/NFFrontEnd/NFCall.mo

@@ -1053,6 +1053,7 @@ protected
           next_origin := intBitOr(origin, ExpOrigin.FOR);
           (arg, ty) := Typing.typeExp(call.exp, next_origin, info);
           {fn} := Function.typeRefCache(call.ref);
+          TypeCheck.checkReductionType(ty, Function.name(fn), call.exp, info);
         then
           (TYPED_REDUCTION(fn, ty, variability, arg, iters), ty, variability);
 

Compiler/NFFrontEnd/NFTypeCheck.mo

@@ -78,6 +78,8 @@ import MetaModelica.Dangerous.*;
 import OperatorOverloading = NFOperatorOverloading;
 import ExpandExp = NFExpandExp;
 import NFFunction.Slot;
+import Util;
+import System;
 
 public
 type MatchKind = enumeration(
@@ -3015,5 +3017,60 @@ algorithm
   end if;
 end checkDimensionType;
 
+function checkReductionType
+  input Type ty;
+  input Absyn.Path name;
+  input Expression exp;
+  input SourceInfo info;
+protected
+  Type ety;
+  String err;
+algorithm
+  err := match name
+    case Absyn.Path.IDENT("sum")
+      then
+        match Type.arrayElementType(ty)
+          case Type.INTEGER() then "";
+          case Type.REAL() then "";
+          else "Integer or Real";
+        end match;
+
+    case Absyn.Path.IDENT("product")
+      then
+        match ty
+          case Type.INTEGER() then "";
+          case Type.REAL() then "";
+          else "scalar Integer or Real";
+        end match;
+
+    case Absyn.Path.IDENT("min")
+      then
+        match ty
+          case Type.INTEGER() then "";
+          case Type.REAL() then "";
+          case Type.BOOLEAN() then "";
+          case Type.ENUMERATION() then "";
+          else "scalar enumeration, Boolean, Integer or Real";
+        end match;
+
+    case Absyn.Path.IDENT("max")
+      then
+        match ty
+          case Type.INTEGER() then "";
+          case Type.REAL() then "";
+          case Type.BOOLEAN() then "";
+          case Type.ENUMERATION() then "";
+          else "scalar enumeration, Boolean, Integer or Real";
+        end match;
+
+    else "";
+  end match;
+
+  if not stringEmpty(err) then
+    Error.addSourceMessageAndFail(Error.INVALID_REDUCTION_TYPE,
+      {Expression.toString(exp), Type.toString(ty), Absyn.pathString(name), err}, info);
+  end if;
+end checkReductionType;
+
 annotation(__OpenModelica_Interface="frontend");
 end NFTypeCheck;

Compiler/Util/Error.mo

@@ -814,6 +814,8 @@ public constant Message OPERATOR_NOT_ENCAPSULATED = MESSAGE(342, TRANSLATION(),
   Util.gettext("Operator %s is not encapsulated."));
 public constant Message NO_SUCH_INPUT_PARAMETER = MESSAGE(343, TRANSLATION(), ERROR(),
   Util.gettext("Function %s has no input parameter named %s."));
+public constant Message INVALID_REDUCTION_TYPE = MESSAGE(344, TRANSLATION(), ERROR(),
+  Util.gettext("Invalid expression ‘%s‘ of type %s in %s reduction, expected %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(),