diff --git a/src/org/rascalmpl/core/library/lang/rascalcore/check/CollectExpression.rsc b/src/org/rascalmpl/core/library/lang/rascalcore/check/CollectExpression.rsc
index c285bc70..86fe6c45 100644
--- a/src/org/rascalmpl/core/library/lang/rascalcore/check/CollectExpression.rsc
+++ b/src/org/rascalmpl/core/library/lang/rascalcore/check/CollectExpression.rsc
@@ -646,16 +646,35 @@ void collect(current: (Expression) `<Expression expression> ( <{Expression ","}*
 void reportCallError(Expression current, Expression callee, list[Expression] actuals, (KeywordArguments[Expression]) `<KeywordArguments[Expression] keywordArguments>`, Solver s){
     kwactuals = keywordArguments is \default ? [ kwa.expression | kwa <- keywordArguments.keywordArgumentList] : [];
     
-    arguments = size(actuals) > 1 ? "arguments of types" : "argument of type";
-    kwarguments = size(kwactuals) > 1 ? "keyword arguments" : "keyword argument";
+    calleeType = s.getType(callee);
+    argumentsTypes = [s.getType(a)| a <- actuals];
+    argumentsTypesText = intercalate(", ", ["`<prettyAType(at)>`" | at <- argumentsTypes]);
+    argumentsText = "arguments of type<size(actuals) > 0 ? "s" : "">";
+    kwargumentsText = "keyword argument<size(kwactuals) > 1 ? "s" : "">";
     if(isEmpty(kwactuals)){
-        s.report(error(current, "%q is defined as %t and cannot be applied to %v %v",  "<callee>", callee, arguments, actuals));
+        someArityOk
+            = overloadedAType(rel[loc l, IdRole idRole, AType ftype] overloads) := calleeType 
+              && any(ovl <- overloads, size(argumentsTypes) == size(getFunctionArgumentTypes(ovl.ftype)));
+        wrongArity = someArityOk ? "" : " with <size(argumentsTypes)> ";
+        if(someArityOk){
+            s.report(error(current, "Cannot call %q with %v %v, given definitions %t",  "<callee>", argumentsText, argumentsTypesText, callee));
+        } else {
+            s.report(error(current, "Cannot call %q with %v argument(s), given definitions %t", "<callee>", size(argumentsTypes), callee));
+        }
     } else {
         kwargs = keywordArguments is \default ? [ kwa | kwa <- keywordArguments.keywordArgumentList] : [];
         kws = [ "`<kwa.name>` of type `<prettyAType(s.getType(kwa.expression))>`" | kwa <- kwargs ];
-        s.report(error(current, "%q is defined as %t and cannot be applied to %v `%v` and %v %v", 
-                                "<callee>", callee, arguments, actuals, kwarguments, 
-                                kws));
+       
+        someOverloadsPositionalOk
+            = overloadedAType(rel[loc l, IdRole idRole, AType ftype] overloads) := calleeType 
+              && any(ovl <- overloads, asubtypeList(argumentsTypes, getFunctionArgumentTypes(ovl.ftype)));
+        if(someOverloadsPositionalOk){
+            s.report(error(current, "Cannot call %q with %v %v, given definitions %t", 
+                                "<callee>", kwargumentsText, kws, callee));
+        } else {
+            s.report(error(current, "Cannot call %q with %v %v and %v %v, given definitions %t", 
+                                "<callee>", argumentsText, argumentsTypesText, kwargumentsText, kws, callee));
+        }
     }
 }
 
@@ -725,8 +744,6 @@ private tuple[rel[loc, IdRole, AType], list[bool]] filterOverloads(rel[loc, IdRo
     return <filteredOverloads, identicalFormals>;
 }
 
-
-
 // TODO: in order to reuse the function below `keywordArguments` is passed as where `keywordArguments[&T] keywordArguments` would make more sense.
 // The interpreter does not handle this well, so revisit this later
 
diff --git a/src/org/rascalmpl/core/library/lang/rascalcore/check/ComputeType.rsc b/src/org/rascalmpl/core/library/lang/rascalcore/check/ComputeType.rsc
index f6f8e567..cad8b1a6 100644
--- a/src/org/rascalmpl/core/library/lang/rascalcore/check/ComputeType.rsc
+++ b/src/org/rascalmpl/core/library/lang/rascalcore/check/ComputeType.rsc
@@ -300,6 +300,7 @@ AType computeADTReturnType(Tree current, str adtName, loc scope, list[AType] for
 void checkExpressionKwArgs(list[Keyword] kwFormals, (KeywordArguments[Expression]) `<KeywordArguments[Expression] keywordArgumentsExp>`, Bindings bindings, Solver s){
     if(keywordArgumentsExp is none) return;
  
+    msgs = [];
     next_arg:
     for(kwa <- keywordArgumentsExp.keywordArgumentList){ 
         kwName = prettyPrintName(kwa.name);
@@ -327,12 +328,15 @@ void checkExpressionKwArgs(list[Keyword] kwFormals, (KeywordArguments[Expression
             availableKws = "; available keyword parameters: <availableKws>";
         }
         
-       s.report(error(kwa, "Undefined keyword argument %q%v", kwName, availableKws));
+       msgs += error(kwa, "Undefined keyword argument %q%v", kwName, availableKws);
     }
+    s.reports(msgs);
 } 
 
 void checkPatternKwArgs(list[Keyword] kwFormals, (KeywordArguments[Pattern]) `<KeywordArguments[Pattern] keywordArgumentsPat>`, Bindings bindings, loc scope, Solver s){
     if(keywordArgumentsPat is none) return;
+    
+    msgs = [];
     next_arg:
     for(kwa <- keywordArgumentsPat.keywordArgumentList){ 
         kwName = prettyPrintName(kwa.name);
@@ -360,8 +364,9 @@ void checkPatternKwArgs(list[Keyword] kwFormals, (KeywordArguments[Pattern]) `<K
             availableKws = "; available keyword parameters: <availableKws>";
         }
         
-        s.report(error(kwa, "Undefined keyword argument %q%v", kwName, availableKws));
+        msgs += error(kwa, "Undefined keyword argument %q%v", kwName, availableKws);
     }
+    s.reports(msgs);
 }
 
 list[Keyword] computeKwFormals(list[KeywordFormal] kwFormals, Solver s){
diff --git a/src/org/rascalmpl/core/library/lang/rascalcore/check/RascalConfig.rsc b/src/org/rascalmpl/core/library/lang/rascalcore/check/RascalConfig.rsc
index b3d9885f..d8f4c40f 100644
--- a/src/org/rascalmpl/core/library/lang/rascalcore/check/RascalConfig.rsc
+++ b/src/org/rascalmpl/core/library/lang/rascalcore/check/RascalConfig.rsc
@@ -342,7 +342,7 @@ void checkOverloading(map[str,Tree] namedTrees, Solver s){
                          if(t1_kwNames != t2_kwNames){     
                             diffkws = t2_kwNames - t1_kwNames;  
                             plural = size(diffkws) > 1 ? "s" : "";
-                            msgs = [ error("Declaration clashes with other declaration of function `<id>` with different keyword parameter<plural> <intercalate(",", [ "`<k>`" | k <- diffkws])> at <d2.defined>", d1.defined) ];
+                            msgs = [ error("Other declaration of function `<id>` has different keyword parameter<plural> <intercalate(",", [ "`<k>`" | k <- diffkws])> at <d2.defined>", d1.defined) ];
                             s.addMessages(msgs);
                           }
                      }
diff --git a/src/org/rascalmpl/core/library/lang/rascalcore/compile/Examples/Tst5.rsc b/src/org/rascalmpl/core/library/lang/rascalcore/compile/Examples/Tst5.rsc
index 2044c473..a22ec9b3 100644
--- a/src/org/rascalmpl/core/library/lang/rascalcore/compile/Examples/Tst5.rsc
+++ b/src/org/rascalmpl/core/library/lang/rascalcore/compile/Examples/Tst5.rsc
@@ -1,5 +1,18 @@
 module lang::rascalcore::compile::Examples::Tst5
 
+
+int f(int a, int b, int c=1, int d=2) = a+b+c+d;
+
+str f(str a, int b, int x = 1, int y = 2) = "<a><b + x + y>";
+
+str f(str a, str b, int x = 1, int y = 2) = "<a><b><x+y>";
+
+value main(){
+    return f("a",2,x="a");
+}   
+
+
+
 //MH
 //public void showUsageCounts(Corpus corpus, lrel[str p, str v, QueryResult qr] res) {
 //    mr = ( p : size([ e | <p,_,e> <- res ]) | p <- corpus );
@@ -25,14 +38,4 @@ module lang::rascalcore::compile::Examples::Tst5
 //      && x == "x" && y == "y";
 //}
 
-import util::Memo;
-
-@memo=expireAfter(minutes=10)
-void foo() { }
-
-//value main(){
-//    if([1, int x] !:= [1]) return x;
-//    return -1;
-//}
-