Description Knut Wannheden 2011-05-17 03:06:24 EDT

The following grammar:

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

import "platform:/resource/org.eclipse.xtext.xbase/model/Xbase.ecore" as xbase
generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
    greetings+=Greeting*;

Greeting returns xbase::XExpression :
    {Greeting} 'Hello';

// copied from Terminals
terminal ID : '^'?('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'_'|'0'..'9')*;

results in a strange error marker on the ID rule: "Cannot inherit from DataType XSwitchExpression".

The reason that the error is reported against the ID rule is that the UnexpectedClassInfoException's superInfo is null as is the EClassifierInfo for a terminal rule ID as the Ecore metamodel hasn't been explicitly imported.

Adding an import for the Ecore metamodel gets rid of the error marker. But note that the UnexpectedClassInfoException are still being thrown but not reported.