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@c -*-texinfo-*-
@c This is part of the GNU Emacs Lisp Reference Manual.
@c Copyright (C) 1990-1993, 1999, 2001-2016 Free Software Foundation,
@c Inc.
@c See the file elisp.texi for copying conditions.
@node Standard Errors
@appendix Standard Errors
@cindex standard errors
Here is a list of the more important error symbols in standard Emacs, grouped
by concept. The list includes each symbol's message and a cross reference
to a description of how the error can occur.
Each error symbol has an set of parent error conditions that is a
list of symbols. Normally this list includes the error symbol itself
and the symbol @code{error}. Occasionally it includes additional
symbols, which are intermediate classifications, narrower than
@code{error} but broader than a single error symbol. For example, all
the errors in accessing files have the condition @code{file-error}. If
we do not say here that a certain error symbol has additional error
conditions, that means it has none.
As a special exception, the error symbol @code{quit} does not have the
condition @code{error}, because quitting is not considered an error.
Most of these error symbols are defined in C (mainly @file{data.c}),
but some are defined in Lisp. For example, the file @file{userlock.el}
defines the @code{file-locked} and @code{file-supersession} errors.
Several of the specialized Lisp libraries distributed with Emacs
define their own error symbols. We do not attempt to list of all
those here.
@xref{Errors}, for an explanation of how errors are generated and
handled.
@table @code
@item error
The message is @samp{error}. @xref{Errors}.
@item quit
The message is @samp{Quit}. @xref{Quitting}.
@item args-out-of-range
The message is @samp{Args out of range}. This happens when trying to
access an element beyond the range of a sequence, buffer, or other
container-like object. @xref{Sequences Arrays Vectors}, and
@xref{Text}.
@item arith-error
The message is @samp{Arithmetic error}. This occurs when trying to
perform integer division by zero. @xref{Numeric Conversions}, and
@xref{Arithmetic Operations}.
@item beginning-of-buffer
The message is @samp{Beginning of buffer}. @xref{Character Motion}.
@item buffer-read-only
The message is @samp{Buffer is read-only}. @xref{Read Only Buffers}.
@item circular-list
The message is @samp{List contains a loop}. This happens when a
circular structure is encountered. @xref{Circular Objects}.
@item cl-assertion-failed
The message is @samp{Assertion failed}. This happens when the
@code{cl-assert} macro fails a test. @xref{Assertions,,, cl, Common Lisp
Extensions}.
@item coding-system-error
The message is @samp{Invalid coding system}. @xref{Lisp and Coding
Systems}.
@item cyclic-function-indirection
The message is @samp{Symbol's chain of function indirections contains
a loop}. @xref{Function Indirection}.
@item cyclic-variable-indirection
The message is @samp{Symbol's chain of variable indirections contains
a loop}. @xref{Variable Aliases}.
@item dbus-error
The message is @samp{D-Bus error}. This is only defined if Emacs was
compiled with D-Bus support. @xref{Errors and Events,,, dbus, D-Bus
integration in Emacs}.
@item end-of-buffer
The message is @samp{End of buffer}. @xref{Character Motion}.
@item end-of-file
The message is @samp{End of file during parsing}. Note that this is
not a subcategory of @code{file-error}, because it pertains to the
Lisp reader, not to file I/O@. @xref{Input Functions}.
@item file-already-exists
This is a subcategory of @code{file-error}. @xref{Writing to Files}.
@item file-date-error
This is a subcategory of @code{file-error}. It occurs when
@code{copy-file} tries and fails to set the last-modification time of
the output file. @xref{Changing Files}.
@item file-error
We do not list the error-strings of this error and its subcategories,
because the error message is normally constructed from the data items
alone when the error condition @code{file-error} is present. Thus,
the error-strings are not very relevant. However, these error symbols
do have @code{error-message} properties, and if no data is provided,
the @code{error-message} property @emph{is} used. @xref{Files}.
@c jka-compr.el
@item compression-error
This is a subcategory of @code{file-error}, which results from
problems handling a compressed file. @xref{How Programs Do Loading}.
@c userlock.el
@item file-locked
This is a subcategory of @code{file-error}. @xref{File Locks}.
@c userlock.el
@item file-supersession
This is a subcategory of @code{file-error}. @xref{Modification Time}.
@c filenotify.el
@item file-notify-error
This is a subcategory of @code{file-error}. It happens, when a file
could not be watched for changes. @xref{File Notifications}.
@c net/ange-ftp.el
@item ftp-error
This is a subcategory of @code{file-error}, which results from
problems in accessing a remote file using ftp. @xref{Remote Files,,,
emacs, The GNU Emacs Manual}.
@item invalid-function
The message is @samp{Invalid function}. @xref{Function Indirection}.
@item invalid-read-syntax
The message is @samp{Invalid read syntax}. @xref{Printed
Representation}.
@item invalid-regexp
The message is @samp{Invalid regexp}. @xref{Regular Expressions}.
@c simple.el
@item mark-inactive
The message is @samp{The mark is not active now}. @xref{The Mark}.
@item no-catch
The message is @samp{No catch for tag}. @xref{Catch and Throw}.
@ignore
@c Not actually used for anything? Probably definition should be removed.
@item protected-field
The message is @samp{Attempt to modify a protected file}.
@end ignore
@item scan-error
The message is @samp{Scan error}. This happens when certain
syntax-parsing functions find invalid syntax or mismatched
parentheses. Conventionally raised with three argument: a
human-readable error message, the start of the obstacle that cannot be
moved over, and the end of the obstacle. @xref{List Motion}, and
@xref{Parsing Expressions}.
@item search-failed
The message is @samp{Search failed}. @xref{Searching and Matching}.
@item setting-constant
The message is @samp{Attempt to set a constant symbol}. This happens
when attempting to assign values to @code{nil}, @code{t}, and keyword
symbols. @xref{Constant Variables}.
@c simple.el
@item text-read-only
The message is @samp{Text is read-only}. This is a subcategory of
@code{buffer-read-only}. @xref{Special Properties}.
@item undefined-color
The message is @samp{Undefined color}. @xref{Color Names}.
@item user-error
The message is the empty string. @xref{Signaling Errors}.
@item void-function
The message is @samp{Symbol's function definition is void}.
@xref{Function Cells}.
@item void-variable
The message is @samp{Symbol's value as variable is void}.
@xref{Accessing Variables}.
@item wrong-number-of-arguments
The message is @samp{Wrong number of arguments}. @xref{Classifying
Lists}.
@item wrong-type-argument
The message is @samp{Wrong type argument}. @xref{Type Predicates}.
@end table
@ignore The following seem to be unused now.
The following kinds of error, which are classified as special cases of
@code{arith-error}, can occur on certain systems for invalid use of
mathematical functions. @xref{Math Functions}.
@table @code
@item domain-error
The message is @samp{Arithmetic domain error}.
@item overflow-error
The message is @samp{Arithmetic overflow error}. This is a subcategory
of @code{domain-error}.
@item range-error
The message is @code{Arithmetic range error}.
@item singularity-error
The message is @samp{Arithmetic singularity error}. This is a
subcategory of @code{domain-error}.
@item underflow-error
The message is @samp{Arithmetic underflow error}. This is a
subcategory of @code{domain-error}.
@end table
@end ignore
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