annotate doc/manual/wm.tex @ 1:60d3ca9d3f6b

Fix stupid bug in help2html.
author David A. Holland
date Tue, 12 Aug 2008 00:13:42 -0400
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1 \chapter{Warning and Error Messages}
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2 \index{Warning messages}\index{Error messages}\index{Messages}\index{Messages}
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3
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4 AnaGram provides diagnostic messages in the \agwindow{Warnings} window
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5 when it finds constructs in your grammar which might be incorrect, or
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6 when it finds that it cannot continue its analysis of your grammar.
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7 AnaGram gives up only if it encounters a syntax error or finds that
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8 you have not specified a \index{Grammar token}\index{Token}grammar
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9 token. Otherwise, it continues its analysis. If AnaGram succeeds in
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10 analyzing your grammar, it will be in a position to build a parser for
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11 you, if you should want one.
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12
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13 When AnaGram finds a syntax error in its input it attempts to continue
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14 scanning for syntax errors but it does no further analysis of the
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15 input.
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16
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17 When AnaGram identifies a problem while it is scanning your syntax
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18 file, it precedes the diagnostic with the line number and column
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19 number at which it found the problem. It does not provide line and
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20 column numbers for those problems it discovers when it is actually
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21 analyzing the grammar.
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22
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23 As an aid to debugging, for all warnings developed while scanning the
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24 syntax file, AnaGram locks the cursor in the syntax file window to the
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25 cursor in the Warnings window. This means that when you move the
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26 cursor bar in the Warnings window to a warning message that has a line
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27 number and column number, the cursor in the syntax file window is
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28 moved to the corresponding line and column.
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29
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30 \section{Alphabetic Listing of Warning Messages}
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31
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32 In this list of warning messages, each message is classified according
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33 to whether it is a warning or an error and according to when it
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34 occurs. Errors prevent AnaGram from building a parser; warnings do
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35 not. Messages may occur at program initialization, while scanning the
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36 syntax file, while analyzing the grammar, or while building the
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37 parser. Messages issued while scanning the syntax file are always
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38 accompanied by the line and column number in the syntax file where the
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39 problem is recognized.
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40
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41 % XXX I would like to change ``warning, analysis'' to ``analysis
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42 % warning'' for all these.
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43
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44 \dualheading{Both error token resynch and auto resynch specified}
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45 {warning, analysis}
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46
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47 Your grammar defines an \index{Error token}\index{Token}\agparam{error
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48 token} and also requests automatic resynchronization. AnaGram will
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49 ignore the request for automatic
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50 \index{Resynchronization}resynchronization and will provide error
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51 token \index{Resynchronization}resynchronization. If you named a token
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52 \agcode{error} but do not wish error token resynchronization, you can
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53 either rename \agcode{error}, or explicitly specify the error token to be
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54 something you don't use in your grammar:
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55
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56 \begin{indentingcode}{0.4in}
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57 {}[ error token = not used ]
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58 \end{indentingcode}
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59
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60 \dualheading{Conflicts resolved by precedence rules}
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61 {warning, analysis}
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62
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63 Your grammar has conflicts which AnaGram has resolved by applying the
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64 precedence rules you supplied. These conflicts are listed in the
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65 \index{Resolved Conflicts}\index{Window}\agwindow{Resolved Conflicts}
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66 window, and are not listed in the
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67 \index{Conflicts}\index{Window}\agwindow{Conflicts} window.
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68
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69 \dualheading{Duplicate production}
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70 {warning, scan}
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71
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72 A \index{Production}production has been duplicated. You will have a
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73 number of reduce-reduce \index{Conflicts}conflicts as a consequence.
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74 Eliminate the duplicate, and the conflicts it caused will go away.
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75
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76 \dualheading{Empty keyword string}
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77 {warning, scan}
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78
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79 \index{Keywords}
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80 Keyword strings must contain at least one character. If you wish a
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81 null match, use a null production instead.
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82
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83 \dualheading{eof token not defined}
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84 {warning, analysis}
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85
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86 \index{Eof token}\index{Token}
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87 You have requested either error token or automatic resynchronization
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88 and you have not defined an end of file token. The resynchronization
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89 procedure will not work correctly at end of file.
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90
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91 \dualheading{Error defining T\textit{nnn}: \textit{token-representation}}
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92 {warning, analysis}
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93
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94 Errors were encountered while attempting to evaluate the
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95 \index{Character set}character set for token number \textit{nnn}.
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96 This warning is always generated in addition to more detailed warnings
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97 that were made when the actual errors were encountered.
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98
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99 \dualheading{Event driven parser cannot use pointer input}
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100 {error, build}
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101
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102 \index{Parser}
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103 \index{Configuration switches}
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104 \index{Event driven}
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105 \index{Pointer input}
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106 If you are going to use \agparam{pointer input}, you should not
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107 specify your parser as \agparam{event driven}.
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108 Conversely, if you really want an event driven parser, you cannot specify
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109 \agparam{pointer input}. See Appendix A, Configuration Parameters for
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110 details on the \agparam{pointer input} and \agparam{event driven}
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111 switches.
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112
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113 \dualheading{Excessive recursion}
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114 {error, scan}
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115
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116 An internal \index{Stack}stack in AnaGram overflowed because of the
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117 complexity of an expression in your grammar. Simplify your grammar by
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118 using definition statements to name subexpressions.
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119
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120 \dualheading{Fatal syntax errors}
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121 {error, analysis}
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122
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123 AnaGram could not complete its analysis of your syntax file because of
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124 syntax errors.
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125
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126 \dualheading{Grammar is ambiguous. See Conflicts Window}
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127 {warning, analysis}
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128
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129 Your grammar is ambiguous. See Chapter 7 for suggestions on how to
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130 deal with the ambiguities.
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131
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132 \dualheading{Inappropriate value}
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133 {warning, scan}
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134
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135 The value assigned to a configuration parameter is not appropriate.
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136 The value of the parameter is unchanged. Check the definition of the
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137 parameter in Appendix A, Configuration Parameters.
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138
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139 \dualheading{Input scan aborted}
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140 {error, scan}
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141
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142 Because of the previous errors, AnaGram was unable to finish scanning
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143 your syntax file.
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144
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145 \dualheading{Insufficient memory}
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146 {warning, scan or analysis}
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147
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148 Not enough memory is available to continue parsing or analyzing the
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149 current syntax file. If you have been running AnaGram for some time,
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150 you might succeed in analyzing your grammar if you restart AnaGram.
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151 Otherwise, you need more memory, or you need to make your grammar
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152 somewhat less complex.
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153
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154 \dualheading{Internal error: ...}
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155 {error, any phase}
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156
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157 This error results from internal consistency checks that should never
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158 fail if AnaGram is
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159 working properly. If you are running AnaGram on Windows 95 or Windows
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160 98, it is
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161 probably not advisable to continue running AnaGram after receiving
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162 this warning without rebooting your system. Sometimes when you are
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163 testing buggy programs using an operating system that does not have
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164 complete memory protection, a program may inadvertently alter part of
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165 the system's memory. If this happens, problems may snowball. In this
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166 situation the problem will not recur after you reboot your system. If
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167 the problem recurs on a freshly booted system, it may be a problem in
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168 AnaGram which should be fixed. Please note the complete error message
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169 and file a bug report via \url{http://www.parsifalsoft.com}.
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170 \index{Internal error}\index{Errors}
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171 A copy of the syntax file which causes the problem
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172 would be of great assistance in fixing it.
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173
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174 \dualheading{Keyword anomalies found}
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175 {warning, analysis}
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176
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177 See the
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178 \index{Anomaly}\index{Keyword Anomalies}\agwindow{Keyword Anomalies}
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179 table for a list of the anomalies found in your syntax file.
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180 See Chapter 7 for a treatment of keyword anomalies.
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181
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182 \dualheading{Missing \textit{syntactic-element-1} in
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183 \textit{syntactic-element-2}}
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184 {error, scan}
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185
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186 AnaGram expects to see an instance of \textit{syntactic element 1} at
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187 this location in an instance of \textit{syntactic element 2}. It
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188 cannot reliably continue parsing its input. Therefore, it limits
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189 further analysis to scanning for syntax errors.
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190
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191 \dualheading{Missing production, T\textit{nnn}: \textit{token-name}}
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192 {error, scan}
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193
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194 \index{Production}
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195 Token number \textit{nnn}, a nonterminal token, appears to be defined
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196 recursively, but there is no initial production to get the recursion
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197 started. Check your grammar closely.
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198
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199 \dualheading{Missing reduction procedure, R\textit{nnn}}
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200 {warning, scan}
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201
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202 \index{Reduction procedure}
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203 A reduction parameter has been defined in this rule, number
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204 \textit{nnn}, but there is no reduction procedure to use it. This
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205 warning is provided in case the lack of a reduction procedure is an
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206 oversight.
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207
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208 \dualheading{Multiple definitions for T\textit{nnn}: \textit{token-name}}
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209 {warning, analysis}
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210
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211 \index{Definitions}
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212 Token number \textit{nnn} has been defined as a character set and has
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213 also been defined as a nonterminal token. It can't be both.
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214
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215 \dualheading{Negative character codes in pointer mode}
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216 {warning, analysis}
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217
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218 \index{Character codes}
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219 You have defined negative character codes and you are using pointer
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220 input. If you are using the default definition for pointer type you
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221 will be reading unsigned characters, so that your parser will never
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222 see the negative codes you have defined.
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223
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224 % I wish there were an easy way to shut this up if the pointer type is
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225 % signed.
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226
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227 \dualheading{No grammar token specified}
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228 {error, analysis}
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229
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230 \index{Grammar token}\index{Token}
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231 You have not specified a grammar token.
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232 Edit your syntax file to specify one.
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233
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234 \dualheading{No productions in syntax file}
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235 {error, analysis}
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236
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237 AnaGram did not find any productions at all in the syntax file. Do
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238 you have the right file?
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239
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240 \dualheading{No such parameter}
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241 {warning, scan}
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242
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243 AnaGram does not recognize the name of the configuration parameter you
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244 have tried to set. Check the spelling of the parameter you wish to
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245 set. See Appendix A, Configuration Parameters.
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246
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247 \dualheading{Not a character set, T\textit{nnn}: \textit{token-name}}
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248 {warning, analysis}
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249
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250 Token number \textit{nnn} has been used on the left side of a
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251 production and in a character set expression defining some other
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252 token. AnaGram will use an empty set in place of token number
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253 \textit{nnn} in the character set expression. You will get another
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254 warning, Error defining token, when AnaGram finishes its evaluation of
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255 the character set.
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256
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257 \dualheading{Nothing reduces T\textit{nnn} -$>$ R\textit{mmm}}
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258 {warning, analysis}
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259
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260 Your grammar does not specify any input to follow an instance of this
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261 rule, rule number \textit{mmm}. In all probability, your grammar does
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262 not have any explicit end of file indicator. If you do not have any
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263 conflicts with token T000, then you can get along without an end of
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264 file indicator. Otherwise, you should modify your grammar so that it
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265 recognizes end of file.
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266
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267 \dualheading{Null character in keyword string}
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268 {warning, scan}
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269
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270 \index{Keywords}
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271 A keyword string cannot have an embedded null character. If you must
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272 allow for a null you will have to rewrite your grammar rule. For
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273 example, instead of
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274
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275 \begin{indentingcode}{0.4in}
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276 widget
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277 -> "abc{\bs}0def"
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278 \end{indentingcode}
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279 write
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280 \begin{indentingcode}{0.4in}
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281 widget
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282 -> "abc", 0, "def"
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283 \end{indentingcode}
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284
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285 If you have defined a symbol as a keyword string, you will have to
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286 rewrite the definition as a production. Suppose, for example, you had
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287 written
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288
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289 \begin{indentingcode}{0.4in}
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290 marker = "abc{\bs}0def"
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291 \end{indentingcode}
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292
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293 You would have to rewrite this as
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294
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295 \begin{indentingcode}{0.4in}
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296 marker
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297 -> "abc", 0, "def"
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298 \end{indentingcode}
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299
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300 \dualheading{Parameter \textit{name} has type void}
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301 {warning, scan}
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302
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303 The specified parameter for a reduction procedure attempts to take the
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304 value of a token whose type has been specified as void.
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305
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306 \dualheading{Range bounds out of order}
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307 {warning, scan}
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308
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309 \index{Character range}\index{Range}
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310 AnaGram interprets 'z-a', for example, as the letters from a to z, but
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311 provides a warning in case the unusual order was a typo.
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312
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313 \dualheading{Recursive definition of char set: \textit{name}}
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314 {warning, analysis}
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315
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316 \index{Character sets}
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317 Character sets cannot be defined recursively.
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318
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319 \dualheading{Redefinition of \textit{name}}
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320 {warning, analysis}
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321
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322 There is a previous definition statement for this variable. AnaGram
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323 ignores the new definition.
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324
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325 \dualheading{Redefinition of grammar token}
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326 {warning, scan}
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327
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328 \index{Grammar token}\index{Token}
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329 AnaGram simply discards the old definition of the grammar, or goal,
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330 token and uses the new one. The last definition in the syntax file
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331 wins. Check your syntax file to be sure you have the grammar token
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332 you want.
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333
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334 \dualheading{Redefinition of token, T\textit{nnn}: \textit{name}}
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335 {warning, scan}
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336
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337 This variable has already been used as a nonterminal token, that is,
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338 it has been used as the left side of a production. AnaGram will
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339 ignore this definition statement.
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340
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341 \dualheading{Suspicious production for \textit{token name}}
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342 {warning, scan}
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343
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344 This production has the form
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345
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346 \begin{indentingcode}{0.4in}
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347 x -> x
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348 \end{indentingcode}
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349
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350 You probably have a typo somewhere. This production causes a conflict
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351 in your grammar. AnaGram leaves this production in your grammar, but
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352 if you build a parser, it will never succeed in recognizing this
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353 production.
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354
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355 \dualheading{Syntax Analysis Aborted}
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356 {error, analysis}
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357
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358 Because of the previous errors, AnaGram was unable to complete its
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359 analysis of your syntax file.
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360
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361 \dualheading{Token not used, T\textit{nnn}: \textit{token name}}
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362 {warning, analysis}
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363
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364 AnaGram doesn't mind, but warns you just in case there was some sort
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365 of oversight.
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366
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367 \dualheading{Type Redefinition of T\textit{nnn}: \textit{token name}}
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368 {warning, analysis}
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369
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370 A previous statement has defined a different data type for token
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371 number \textit{nnn}. This definition will override the previous one.
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372 If you intend to use different type definitions, you should use
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373 extreme caution and check the generated code to verify that your
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374 reduction procedures are getting the values you intended.
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375
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376 \dualheading{Undefined symbol: \textit{name}}
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377 {warning, analysis}
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378
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379 \index{Symbol}
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380 AnaGram encountered this undefined symbol while evaluating a character
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381 set. The next warning in the Warnings window identifies the
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382 particular token AnaGram was trying to evaluate.
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383
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384 \dualheading{Undefined token T\textit{nnn}: \textit{name}}
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385 {warning, analysis}
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386
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387 \index{Token}
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388 This name has been used as though it represented a token, but there is
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389 no definition of it as a terminal nor does any production define it as
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390 a nonterminal.
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391
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392 \dualheading{Unexpected \textit{syntactic-element-1} in
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393 \textit{syntactic-element-2}}
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394 {error, scan}
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395
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396 AnaGram does not expect to see an instance of
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397 \textit{syntactic-element-1} at this location in an instance of
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398 \textit{syntactic-element-2}.
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399 It cannot reliably continue parsing its input. Therefore, it limits
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400 further analysis to scanning for syntax errors. If this error is not
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401 the result of some prior error, you should correct your syntax file.
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402 Remember that this error could just as well result from something
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
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403 missing as well as from something extraneous.
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404
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405 \dualheading{Void token, \textit{token-name}, used as parameter}
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406 {warning, scan}
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407
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408 \index{Token}
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409 The token being declared as void has previously been used as a
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410 parameter for a reduction procedure. Your C compiler will complain
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411 when it tries to compile the call to the reduction procedure.