This returns an editable version of the item. @warning: Never change an entry that affects the hash, or the equals(..) function. That would completely

* Returns a not reference-counted IndexedString that represents the given index. * * @warning It is dangerous dealing with indices directly,

* @return whether the reason (result indication) of this record is an error */

@todo see whether it would be useful to create an own TypeAliasDeclaration sub-class for this

Returns the first valid index that has a data-value larger or equal to @p data. Returns -1 if nothing is found.

! Sets the error \a line number. */

Copies this item into the given one