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1df7defd80
Be more systematic about using "@." (not ".") at end of sentence that ends in a capital letter, and about appending "@:" after non-ends of sentences that end in a lower case letter followed by "." followed by whitespace. Omit unnecessary use of "@:" and "@.". Similarly for "?" and "!". Be more consistent about putting a comma after "i.e." and "e.g."; this is the typical American style and it's easier to code in Texinfo. Fixes: debbugs:12973
219 lines
7.4 KiB
Plaintext
219 lines
7.4 KiB
Plaintext
@c -*-texinfo-*-
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@c This is part of the GNU Emacs Lisp Reference Manual.
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@c Copyright (C) 1990-1993, 1999, 2001-2012 Free Software Foundation, Inc.
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@c See the file elisp.texi for copying conditions.
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@node Standard Errors
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@appendix Standard Errors
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@cindex standard errors
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Here is a list of the more important error symbols in standard Emacs,
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grouped by concept. The list includes each symbol's message (on the
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@code{error-message} property of the symbol) and a cross reference to a
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description of how the error can occur.
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Each error symbol has an @code{error-conditions} property that is a
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list of symbols. Normally this list includes the error symbol itself
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and the symbol @code{error}. Occasionally it includes additional
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symbols, which are intermediate classifications, narrower than
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@code{error} but broader than a single error symbol. For example, all
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the errors in accessing files have the condition @code{file-error}. If
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we do not say here that a certain error symbol has additional error
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conditions, that means it has none.
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As a special exception, the error symbol @code{quit} does not have the
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condition @code{error}, because quitting is not considered an error.
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@c You can grep for "(put 'foo 'error-conditions ...) to find
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@c examples defined in Lisp. E.g., soap-client.el, sasl.el.
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Most of these error symbols are defined in C (mainly @file{data.c}),
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but some are defined in Lisp. For example, the file @file{userlock.el}
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defines the @code{file-locked} and @code{file-supersession} errors.
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Several of the specialized Lisp libraries distributed with Emacs
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define their own error symbols. We do not attempt to list of all
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those here.
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@xref{Errors}, for an explanation of how errors are generated and
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handled.
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@table @code
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@item error
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The message is @samp{error}. @xref{Errors}.
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@item quit
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The message is @samp{Quit}. @xref{Quitting}.
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@item args-out-of-range
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The message is @samp{Args out of range}. This happens when trying to
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access an element beyond the range of a sequence, buffer, or other
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container-like object. @xref{Sequences Arrays Vectors}, and
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@xref{Text}.
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@item arith-error
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The message is @samp{Arithmetic error}. This occurs when trying to
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perform integer division by zero. @xref{Numeric Conversions}, and
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@xref{Arithmetic Operations}.
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@item beginning-of-buffer
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The message is @samp{Beginning of buffer}. @xref{Character Motion}.
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@item buffer-read-only
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The message is @samp{Buffer is read-only}. @xref{Read Only Buffers}.
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@item circular-list
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The message is @samp{List contains a loop}. This happens when a
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circular structure is encountered. @xref{Circular Objects}.
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@item cl-assertion-failed
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The message is @samp{Assertion failed}. This happens when the
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@code{cl-assert} macro fails a test. @xref{Assertions,,, cl, Common Lisp
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Extensions}.
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@item coding-system-error
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The message is @samp{Invalid coding system}. @xref{Lisp and Coding
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Systems}.
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@item cyclic-function-indirection
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The message is @samp{Symbol's chain of function indirections contains
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a loop}. @xref{Function Indirection}.
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@item cyclic-variable-indirection
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The message is @samp{Symbol's chain of variable indirections contains
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a loop}. @xref{Variable Aliases}.
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@item dbus-error
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The message is @samp{D-Bus error}. This is only defined if Emacs was
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compiled with D-Bus support. @xref{Errors and Events,,, dbus, D-Bus
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integration in Emacs}.
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@item end-of-buffer
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The message is @samp{End of buffer}. @xref{Character Motion}.
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@item end-of-file
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The message is @samp{End of file during parsing}. Note that this is
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not a subcategory of @code{file-error}, because it pertains to the
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Lisp reader, not to file I/O@. @xref{Input Functions}.
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@item file-already-exists
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This is a subcategory of @code{file-error}. @xref{Writing to Files}.
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@item file-date-error
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This is a subcategory of @code{file-error}. It occurs when
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@code{copy-file} tries and fails to set the last-modification time of
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the output file. @xref{Changing Files}.
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@item file-error
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We do not list the error-strings of this error and its subcategories,
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because the error message is normally constructed from the data items
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alone when the error condition @code{file-error} is present. Thus,
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the error-strings are not very relevant. However, these error symbols
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do have @code{error-message} properties, and if no data is provided,
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the @code{error-message} property @emph{is} used. @xref{Files}.
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@c jka-compr.el
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@item compression-error
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This is a subcategory of @code{file-error}, which results from
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problems handling a compressed file. @xref{How Programs Do Loading}.
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@c userlock.el
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@item file-locked
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This is a subcategory of @code{file-error}. @xref{File Locks}.
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@c userlock.el
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@item file-supersession
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This is a subcategory of @code{file-error}. @xref{Modification Time}.
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@c net/ange-ftp.el
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@item ftp-error
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This is a subcategory of @code{file-error}, which results from
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problems in accessing a remote file using ftp. @xref{Remote Files,,,
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emacs, The GNU Emacs Manual}.
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@item invalid-function
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The message is @samp{Invalid function}. @xref{Function Indirection}.
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@item invalid-read-syntax
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The message is @samp{Invalid read syntax}. @xref{Printed
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Representation}.
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@item invalid-regexp
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The message is @samp{Invalid regexp}. @xref{Regular Expressions}.
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@c simple.el
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@item mark-inactive
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The message is @samp{The mark is not active now}. @xref{The Mark}.
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@item no-catch
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The message is @samp{No catch for tag}. @xref{Catch and Throw}.
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@ignore
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@c Not actually used for anything? Probably definition should be removed.
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@item protected-field
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The message is @samp{Attempt to modify a protected file}.
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@end ignore
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@item scan-error
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The message is @samp{Scan error}. This happens when certain
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syntax-parsing functions find invalid syntax or mismatched
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parentheses. @xref{List Motion}, and @xref{Parsing Expressions}.
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@item search-failed
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The message is @samp{Search failed}. @xref{Searching and Matching}.
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@item setting-constant
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The message is @samp{Attempt to set a constant symbol}. This happens
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when attempting to assign values to @code{nil}, @code{t}, and keyword
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symbols. @xref{Constant Variables}.
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@c simple.el
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@item text-read-only
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The message is @samp{Text is read-only}. This is a subcategory of
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@code{buffer-read-only}. @xref{Special Properties}.
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@item undefined-color
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The message is @samp{Undefined color}. @xref{Color Names}.
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@item user-error
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The message is the empty string. @xref{Signaling Errors}.
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@item void-function
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The message is @samp{Symbol's function definition is void}.
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@xref{Function Cells}.
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@item void-variable
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The message is @samp{Symbol's value as variable is void}.
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@xref{Accessing Variables}.
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@item wrong-number-of-arguments
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The message is @samp{Wrong number of arguments}. @xref{Classifying
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Lists}.
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@item wrong-type-argument
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The message is @samp{Wrong type argument}. @xref{Type Predicates}.
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@end table
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@ignore The following seem to be unused now.
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The following kinds of error, which are classified as special cases of
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@code{arith-error}, can occur on certain systems for invalid use of
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mathematical functions. @xref{Math Functions}.
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@table @code
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@item domain-error
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The message is @samp{Arithmetic domain error}.
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@item overflow-error
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The message is @samp{Arithmetic overflow error}. This is a subcategory
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of @code{domain-error}.
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@item range-error
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The message is @code{Arithmetic range error}.
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@item singularity-error
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The message is @samp{Arithmetic singularity error}. This is a
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subcategory of @code{domain-error}.
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@item underflow-error
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The message is @samp{Arithmetic underflow error}. This is a
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subcategory of @code{domain-error}.
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@end table
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@end ignore
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