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(Defining Abbrevs): Mention `define-abbrev' 'force

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value for system-flag argument.
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Glenn Morris 2006-12-10 03:05:30 +00:00
parent 8d4a66af92
commit 4e34846db4
1 changed files with 4 additions and 1 deletions
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5
lispref/abbrevs.texi
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@ -165,7 +165,10 @@ returns @code{nil}, @code{expand-abbrev} also returns @code{nil}, as
if expansion had not really occurred.
If @var{system-flag} is non-@code{nil}, that marks the abbrev as a
``system'' abbrev with the @code{system-type} property.
``system'' abbrev with the @code{system-type} property. Unless
@var{system-flag} has the value @code{force}, a ``system'' abbrev will
not overwrite an existing definition for a non-``system'' abbrev of the
same name.
Normally the function @code{define-abbrev} sets the variable
@code{abbrevs-changed} to @code{t}, if it actually changes the abbrev.