lispref/errors.texi

   1 @c -*-texinfo-*-
   2 @c This is part of the GNU Emacs Lisp Reference Manual.
   3 @c Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
   4 @c See the file elisp.texi for copying conditions.
   5 @setfilename ../info/errors
   6 @node Standard Errors, Standard Buffer-Local Variables, GNU Emacs Internals, Top
   7 @appendix Standard Errors
   8
   9   Here is the complete list of the error symbols in standard Emacs,
  10 grouped by concept.  The list includes each symbol's message (on the
  11 @code{error-message} property of the symbol) and a cross reference to a
  12 description of how the error can occur.
  13
  14   Each error symbol has an @code{error-conditions} property that is a
  15 list of symbols.  Normally this list includes the error symbol itself
  16 and the symbol @code{error}.  Occasionally it includes additional
  17 symbols, which are intermediate classifications, narrower than
  18 @code{error} but broader than a single error symbol.  For example, all
  19 the errors in accessing files have the condition @code{file-error}.
  20
  21   As a special exception, the error symbol @code{quit} does not have the
  22 condition @code{error}, because quitting is not considered an error.
  23
  24   @xref{Errors}, for an explanation of how errors are generated and
  25 handled.
  26
  27 @table @code
  28 @item @var{symbol}
  29 @var{string}; @var{reference}.
  30
  31 @item error
  32 @code{"error"}@*
  33 @xref{Errors}.
  34
  35 @item quit
  36 @code{"Quit"}@*
  37 @xref{Quitting}.
  38
  39 @item args-out-of-range
  40 @code{"Args out of range"}@*
  41 @xref{Sequences Arrays Vectors}.
  42
  43 @item arith-error
  44 @code{"Arithmetic error"}@*
  45 See @code{/} and @code{%} in @ref{Numbers}.
  46
  47 @item beginning-of-buffer
  48 @code{"Beginning of buffer"}@*
  49 @xref{Motion}.
  50
  51 @item buffer-read-only
  52 @code{"Buffer is read-only"}@*
  53 @xref{Read Only Buffers}.
  54
  55 @item cyclic-function-indirection
  56 @code{"Symbol's chain of function indirections contains a loop"}@*
  57 @xref{Function Indirection}.
  58
  59 @item end-of-buffer
  60 @code{"End of buffer"}@*
  61 @xref{Motion}.
  62
  63 @item end-of-file
  64 @code{"End of file during parsing"}@*
  65 This is not a @code{file-error}.@*
  66 @xref{Input Functions}.
  67
  68 @item file-error
  69 This error and its subcategories do not have error-strings, because the
  70 error message is constructed from the data items alone when the error
  71 condition @code{file-error} is present.@*
  72 @xref{Files}.
  73
  74 @item file-locked
  75 This is a @code{file-error}.@*
  76 @xref{File Locks}.
  77
  78 @item file-already-exists
  79 This is a @code{file-error}.@*
  80 @xref{Writing to Files}.
  81
  82 @item file-supersession
  83 This is a @code{file-error}.@*
  84 @xref{Modification Time}.
  85
  86 @item invalid-function
  87 @code{"Invalid function"}@*
  88 @xref{Classifying Lists}.
  89
  90 @item invalid-read-syntax
  91 @code{"Invalid read syntax"}@*
  92 @xref{Input Functions}.
  93
  94 @item invalid-regexp
  95 @code{"Invalid regexp"}@*
  96 @xref{Regular Expressions}.
  97
  98 @item no-catch
  99 @code{"No catch for tag"}@*
 100 @xref{Catch and Throw}.
 101
 102 @item search-failed
 103 @code{"Search failed"}@*
 104 @xref{Searching and Matching}.
 105
 106 @item setting-constant
 107 @code{"Attempt to set a constant symbol"}@*
 108 The values of the symbols @code{nil} and @code{t}
 109 may not be changed.@*
 110 @xref{Constant Variables, , Variables that Never Change}.
 111
 112 @item undefined-color
 113 @code{"Undefined color"}@*
 114 @xref{Color Names}.
 115
 116 @item void-function
 117 @code{"Symbol's function definition is void"}@*
 118 @xref{Function Cells}.
 119
 120 @item void-variable
 121 @code{"Symbol's value as variable is void"}@*
 122 @xref{Accessing Variables}.
 123
 124 @item wrong-number-of-arguments
 125 @code{"Wrong number of arguments"}@*
 126 @xref{Classifying Lists}.
 127
 128 @item wrong-type-argument
 129 @code{"Wrong type argument"}@*
 130 @xref{Type Predicates}.
 131 @end table
 132
 133   These error types, which are all classified as special cases of
 134 @code{arith-error}, can occur on certain systems for invalid use of
 135 mathematical functions.
 136
 137 @table @code
 138 @item domain-error
 139 @code{"Arithmetic domain error"}@*
 140 @xref{Math Functions}.
 141
 142 @item overflow-error
 143 @code{"Arithmetic overflow error"}@*
 144 @xref{Math Functions}.
 145
 146 @item range-error
 147 @code{"Arithmetic range error"}@*
 148 @xref{Math Functions}.
 149
 150 @item singularity-error
 151 @code{"Arithmetic singularity error"}@*
 152 @xref{Math Functions}.
 153
 154 @item underflow-error
 155 @code{"Arithmetic underflow error"}@*
 156 @xref{Math Functions}.
 157 @end table