Description Sebastian Zarnekow 2011-11-27 12:11:22 EST

1) Create a new Xtext project with this initial grammar ([] indicate the selection)

==

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

[generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"]

Model:
	greetings+=Greeting*;
	
Greeting:
	'Hello' name=ID '!';


==

2) Replace the selection with this import 

import "http://www.eclipse.org/xtext/xbase/Xbase"

==

3) Wait for the reconciler to mark both rules as erroneous

4) Cmd+Z (undo)

5) See the dangling error marker on

Greeting:
	'Hello' name=ID '!';
                    ^^^^^^^^

which is probably the length difference between the replace region and the replacement string