Expected output.

Belonging to [master]:
  - OpenModelica/OMCompiler#2235
  - OpenModelica/OpenModelica-testsuite#860

flattening/modelica/scodeinst/FuncOverloadAmbiguousDefault.mo

@@ -23,12 +23,11 @@ model FuncOverloadAmbiguousDefault
 end FuncOverloadAmbiguousDefault;
 
 // Result:
-// Ambiguous call: OV(1)
-// Candidates:
+// Error processing file: FuncOverloadAmbiguousDefault.mo
+// [flattening/modelica/scodeinst/FuncOverloadAmbiguousDefault.mo:22:3-22:20:writable] Error: Ambiguous matching functions found for OV(/*Integer*/ 1).
+// Candidates are:
 //   OV(Integer g1, Integer g2 = 1) => Integer
 //   OV(Integer f1) => Integer
-// Error processing file: FuncOverloadAmbiguousDefault.mo
-// Error: Internal error Instantiation of FuncOverloadAmbiguousDefault failed with no error message.
 //
 // # Error encountered! Exiting...
 // # Please check the error message and the flags.