Reserved Words

{AI95-00284-02} {AI95-00395-01} {AI05-0091-1} The following are the reserved words. Within a program, some or all of the letters of a reserved word may be in upper case.

The syntactic category identifier no longer allows reserved words. We have added the few reserved words that are legal explicitly to the syntax for attribute_reference. Allowing identifier to include reserved words has been a source of confusion for some users, and differs from the way they are treated in the C and Pascal language definitions.

abort	else	new	return
abs	elsif	not	reverse
abstract	end	null
accept	entry		select
access	exception	of	separate
aliased	exit	or	some
all		others	subtype
and	for	out	synchronized
array	function	overriding
at			tagged
	generic	package	task
begin	goto	parallel	terminate
body		pragma	then
	if	private	type
case	in	procedure
constant	interface	protected	until
	is		use
declare		raise
delay	limited	range	when
delta	loop	record	while
digits		rem	with
do	mod	renames
		requeue	xor

NOTE {AI12-0440-1} The reserved words appear in lower case boldface in this document, except when used in the designator of an attribute (see 4.1.4). Lower case boldface is also used for a reserved word in a string_literal used as an operator_symbol. This is merely a convention — programs can be written in whatever typeface is desired and available.

Incompatibilities With Ada 83

The following words are not reserved in Ada 83, but are reserved in Ada 95: abstract, aliased, protected, requeue, tagged, until.

Wording Changes from Ada 83

Incompatibilities With Ada 95

{AI95-00284-02} The following words are not reserved in Ada 95, but are reserved in Ada 2005: interface, overriding, synchronized. A special allowance is made for pragma Interface (see J.12). Uses of these words as identifiers will need to be changed, but we do not expect them to be common.

Wording Changes from Ada 95

{AI95-00395-01} The definition of upper case equivalence has been modified to allow identifiers using all of the characters of ISO 10646. This change has no effect on the character sequences that are reserved words, but does make some unusual sequences of characters illegal.

Incompatibilities With Ada 2005

{AI05-0091-1} Correction: Removed other_format characters from reserved words in order to be compatible with the latest Unicode recommendations. This change can only affect programs written for original Ada 2005, and there is little reason to put other_format characters into reserved words in the first place, so there should be very few such programs.

{AI05-0176-1} The following word is not reserved in Ada 2005, but is reserved in Ada 2012: some. Uses of this word as an identifier will need to be changed, but we do not expect them to be common.

Incompatibilities With Ada 2012

{AI12-0119-1} The following word is not reserved in Ada 2012, but is reserved in Ada 2022: parallel. Uses of this word as an identifier will need to be changed, but we do not expect them to be common.