Show where the lexer is in {RubyLexer,ParserSupport}#toString()

Author: eregon

src/main/java/org/truffleruby/parser/lexer/RubyLexer.java

@@ -3779,4 +3779,13 @@ private boolean isFirstCodepointUppercase(Rope rope) {
             return ropeEncoding.isUpper(firstCharacter);
         }
     }
+
+    public String getLocation() {
+        return getFile() + ":" + ruby_sourceline;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString() + " @ " + getLocation();
+    }
 }

src/main/java/org/truffleruby/parser/parser/ParserSupport.java

@@ -191,6 +191,11 @@ public void reset() {
         inDefinition = false;
     }
 
+    @Override
+    public String toString() {
+        return super.toString() + " @ " + lexer.getLocation();
+    }
+
     public StaticScope getCurrentScope() {
         return currentScope;
     }