 		func toAbstract() throws -> AST? {
 			return AST.ExpressionList(
                 expression: try! expression.toAbstract() as! AST.Expression,
-                optExpression: try! repeatingOptionalExpressions?.toAbstract() as! AST.Expression)
+                optExpression: try! repeatingOptionalExpressions?.toAbstract() as? AST.Expression)
 		}
 	}
 

		}

		func toAbstract() throws -> AST? {
			return try! optionalIdent?.toAbstract(identifier)
		}
	}


		func toAbstract(repeatingCmds: ASTConvertible?) throws -> AST? {
			return AST.CmdCall(
				expressionList: try! expressionList.toAbstract() as! AST.ExpressionList,
				nextCmd: try! repeatingCmds?.toAbstract() as? AST.Cmd)
		}
	}

