docs: public final void this_key() throws RecognitionException {
  		Token id=null;
  
  		try {
  			// src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:796:5: ({...}? =>id= ID )
  			// src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:796:12: {...}? =>id= ID
  			{
  			if ( !(((helper.validateIdentifierKey(DroolsSoftKeywords.THIS)))) ) {
  				if (state.backtracking>0) {state.failed=true; return;}
  				throw new FailedPredicateException(input, "this_key", "(helper.validateIdentifierKey(DroolsSoftKeywords.THIS))");
  			}
  			id=(Token)match(input,ID,FOLLOW_ID_in_this_key5085); if (state.failed) return;
  			if ( state.backtracking==0 ) { helper.emit(id, DroolsEditorType.KEYWORD); }
  			}
  
  		}
  
  		catch (RecognitionException re) {
  		    throw re;
  		}
  
  		finally {
  			// do for sure before leaving
  		}
  	}