parsert is not a messaget

Use a messaget member "log" for output. The member is public for now to
facilitate a step-by-step transition towards not constructing messaget objects
without a configured message handler, which is deprecated.

Author: tautschnig

src/util/parser.cpp

@@ -35,12 +35,6 @@ void parsert::parse_error(
   if(!before.empty())
     tmp += " before '" + before + "'";
 
-#if 0
-  source_locationt tmp_source_location=source_location;
-  tmp_source_location.set_column(column-before.size());
-  print(1, tmp, -1, tmp_source_location);
-#else
   log.error().source_location = source_location;
   log.error() << tmp << messaget::eom;
-#endif
 }

src/util/parser.h

@@ -39,7 +39,7 @@ class parsert
     last_line.clear();
   }
 
-  parsert():in(nullptr) { clear(); }
+  parsert():in(nullptr), log(null_message_handler) { clear(); }
   virtual ~parsert() { }
 
   // The following are for the benefit of the scanner
@@ -133,6 +133,7 @@ class parsert
 
   // should be protected or even just be a reference to a message handler, but
   // for now enables a step-by-step transition
+  null_message_handlert null_message_handler;
   messaget log;
 
 protected: