[[Property:title|Eiffel language reserved words]]
[[Property:link_title|Eiffel programming language reserved words]]
[[Property:weight|1]]
[[Property:uuid|047ce062-45de-f25c-f356-ee8ec0fc2d1d]]
In the Eiffel language, there are certain words that are considered "reserved". These words have specific meanings recognized by the compiler. As such, it is invalid to attempt to use a reserved word as an ordinary language identifier.

The reserved words listed in the ISO/ECMA standard are show below with a brief explanation of their meanings.

==Reserved words==


===agent===

Used to specify an [[ET: Agents|agent]]. 

:[[Eiffel language syntax#Agents|Syntax.]]


===alias===

Used to identify an alternative or alias feature name. 

:[[Eiffel language syntax#Feature names|Syntax.]]

[[ET: The Dynamic Structure: Execution Model#Infix and prefix notations|Usage for infix/prefix notations.]]

[[ET: The Static Picture: System Organization#External software|Usage in interfaces to external software.]]

:[[Eiffel language syntax#External routines|Syntax.]]


===all===

Used in [[ET: Inheritance#Changing the export status|export adaptation]] to indicate that a chosen export status applies to all features inherited from a given parent.

:[[Eiffel language syntax#Export adaptation|Syntax.]]


===and===

The logical conjunction [[Eiffel language syntax#Operators|operator]]. Strict when used alone, nonstrict when used with [[#then|then]].


===as===


===assign===


===attribute===


===check===


===class===


===convert===


===create===


===Current===


===debug===


===deferred===


===do===


===else===


===elseif===


===end===


===ensure===


===expanded===


===export===


===external===


===False===


===feature===


===from===


===frozen===


===if===


===implies===


===inherit===


===inspect===


===invariant===


===like===


===local===


===loop===


===not===


===note===


===obsolete===


===old===


===once===


===only===


===or===


===Precursor===


===redefine===


===rename===


===require===


===rescue===


===Result===


===retry===


===select===


===separate===


===then===


===True===


===TUPLE===


===undefine===


===until===


===variant===


===Void===


===when===


===xor===