Syntax level variant settings by version

The Eiffel Software compiler provides a set of options, available in Project Settings, which allows users to select a variant of the Eiffel programming language syntax that best suits their needs. The meanings of these options, and in fact the options themselves, are subject to change from one version to the next. Below you will find a table that defines the meaning of the syntax level variants for each version.

The options are distinguished by how the compiler handles the processing of certain words found in Eiffel text which may be:

Associated with language constructs, or
Allowed as identifiers, or
In the case of some options as either keywords or identifiers depending upon the context in which the words are found.

**Legend**
keyword	Accepted as a keyword
keyword	Accepted as a keyword with a warning
keyword	Accepted as a keyword or if grammar permits as an identifier with a warning
name	Accepted as an identifier with a warning
name	Accepted as an identifier

**Constructs affected by the *syntax* project setting**
Release	Setting value*
Release	Obsolete	Transitional	Standard	Provisional
7.0 and more recent	across	across	across	across
	assign	assign	assign	assign
	attached	attached	attached	attached
	attribute	attribute	attribute	attribute
	detachable	detachable	detachable	detachable
	indexing	indexing	indexing	indexing
	is	is	is	is
	note	note	note	note
	some	some	some	some
6.8, 6.7, 6.6	across	across	across	across
	assign	assign	assign	assign
	attached	attached	attached	attached
	attribute	attribute	attribute	attribute
	detachable	detachable	detachable	detachable
	indexing	indexing	indexing	indexing
	is	is	is	is
	note	note	note	note
	some	some	some	some

* A general explanation of what each variant setting means can be found in the section on setting the syntax variant.

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