Commit c986813b authored by Chong Yidong's avatar Chong Yidong

(Derived Modes): Note that define-derive-mode sets the mode-class

parent 31c9eebb
......@@ -738,7 +738,7 @@ documentation of the major mode.
one. An easy way to do this is to use @code{define-derived-mode}.
@defmac define-derived-mode variant parent name docstring keyword-args@dots{} body@dots{}
This construct defines @var{variant} as a major mode command, using
This macro defines @var{variant} as a major mode command, using
@var{name} as the string form of the mode name. @var{variant} and
@var{parent} should be unquoted symbols.
......@@ -776,6 +776,12 @@ In addition, you can specify how to override other aspects of
evaluates the forms in @var{body} after setting up all its usual
overrides, just before running the mode hooks.
If @var{parent} has a non-@code{nil} @code{mode-class} symbol
property, then @code{define-derived-mode} sets the @code{mode-class}
property of @var{variant} to the same value. This ensures, for
example, that if @var{parent} is a special mode, then @var{variant} is
also a special mode (@pxref{Major Mode Conventions}).
You can also specify @code{nil} for @var{parent}. This gives the new
mode no parent. Then @code{define-derived-mode} behaves as described
above, but, of course, omits all actions connected with @var{parent}.
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