1 | # spec/ysh-builtin-error
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2 |
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3 | ## our_shell: ysh
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4 |
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5 | #### try requires an argument
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6 |
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7 | try
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8 | echo status=$?
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9 |
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10 | ## status: 3
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11 | ## STDOUT:
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12 | ## END
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13 |
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14 | #### User errors behave like builtin errors
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15 | func divide(a, b) {
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16 | if (b === 0) {
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17 | error 'divide by zero' (code=3)
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18 | }
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19 |
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20 | return (a / b)
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21 | }
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22 |
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23 | # errors can be caught with try
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24 | try { = divide(42, 0) }
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25 | echo status=$_status
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26 |
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27 | = divide(42, 0)
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28 |
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29 | ## status: 3
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30 | ## STDOUT:
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31 | status=3
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32 | ## END
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33 |
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34 | #### _error register is initially empty dict
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35 |
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36 | echo $[type(_error)]
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37 | echo $[len(_error)]
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38 |
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39 | ## STDOUT:
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40 | Dict
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41 | 0
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42 | ## END
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43 |
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44 | #### error builtin sets _error.message, which can be used by programs
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45 |
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46 | func divide(a, b) {
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47 | if (b === 0) {
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48 | error "divide by zero: $a / $b" (code=3)
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49 | }
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50 | return (a / b)
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51 | }
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52 |
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53 | try { = divide(42, 0) }
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54 | echo status=$_status
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55 | echo message=$[_error.message]
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56 |
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57 | proc p {
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58 | echo $[divide(5, 0)]
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59 | }
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60 |
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61 | try { p }
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62 | echo status=$_status
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63 | echo message=$[_error.message]
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64 |
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65 | ## STDOUT:
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66 | status=3
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67 | message=divide by zero: 42 / 0
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68 | status=3
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69 | message=divide by zero: 5 / 0
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70 | ## END
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71 |
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72 | #### error builtin adds named args as properties on _error Dict
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73 |
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74 | try {
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75 | error 'bad' (code=99)
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76 | }
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77 | pp line (_error)
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78 |
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79 | # Note: myData co
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80 | try {
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81 | error 'bad' (code=99, myData={spam:'eggs'})
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82 | }
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83 | pp line (_error)
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84 |
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85 | try {
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86 | error 'bad' (code=99, message='cannot override')
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87 | }
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88 | pp line (_error)
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89 |
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90 | ## STDOUT:
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91 | (Dict) {"code":99,"message":"bad"}
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92 | (Dict) {"myData":{"spam":"eggs"},"code":99,"message":"bad"}
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93 | (Dict) {"message":"bad","code":99}
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94 | ## END
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95 |
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96 | #### Errors within multiple functions
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97 | func inverse(x) {
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98 | if (x === 0) {
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99 | error '0 does not have an inverse' # default status is 1
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100 | }
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101 |
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102 | return (1 / x)
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103 | }
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104 |
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105 | func invertList(list) {
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106 | var result = []
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107 | for item in (list) {
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108 | call result->append(inverse(item))
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109 | }
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110 | return (result)
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111 | }
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112 |
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113 | = invertList([1, 2, 0])
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114 | ## status: 10
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115 | ## STDOUT:
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116 | ## END
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117 |
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118 | #### Impact of errors on var declaration
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119 | func alwaysError() {
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120 | error "it's an error" (status=100)
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121 | }
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122 |
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123 | try {
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124 | var mylist = [1 + 2, alwaysError()]
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125 |
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126 | echo this will never be printed
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127 | }
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128 | = mylist # undefined! status becomes 1
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129 | ## status: 1
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130 | ## STDOUT:
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131 | ## END
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132 |
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133 | #### default error code is 10
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134 | error 'some error'
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135 | ## status: 10
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136 | ## STDOUT:
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137 | ## END
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138 |
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139 | #### error code should be an integer
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140 | error 'error' (code='a string?')
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141 | ## status: 3
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142 | ## STDOUT:
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143 | ## END
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144 |
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145 | #### Error code should be named arg, not positional
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146 | error msg (100)
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147 | ## status: 3
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148 | ## STDOUT:
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149 | ## END
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150 |
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151 | #### error cannot take word args
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152 | error uh-oh ('error', status=1)
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153 | ## status: 3
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154 | ## STDOUT:
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155 | ## END
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156 |
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157 | #### error requires arguments
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158 | error
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159 | ## status: 2
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160 | ## STDOUT:
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161 | ## END
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162 |
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163 | #### error cannot have a code of 0
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164 | error ('error', code=0)
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165 | ## status: 2
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166 | ## STDOUT:
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167 | ## END
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168 |
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169 | #### try { error oops }
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170 |
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171 | try { error oops }
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172 | echo status=$_status
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173 |
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174 | ## STDOUT:
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175 | status=10
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176 | ## END
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177 |
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178 | #### Handle _error.code
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179 |
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180 | proc failing {
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181 | error 'failed' (code=99)
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182 | }
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183 |
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184 | try {
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185 | failing
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186 | }
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187 | if (_error.code === 99) {
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188 | echo PASS
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189 | }
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190 |
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191 | try {
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192 | failing
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193 | }
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194 | case (_error.code) {
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195 | (0) { echo success }
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196 | (1) { echo one }
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197 | (else) { echo CASE PASS }
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198 | }
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199 |
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200 | ## STDOUT:
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201 | PASS
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202 | CASE PASS
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203 | ## END
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204 |
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205 |
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206 | #### failed builtin usage
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207 |
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208 | set +o errexit
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209 |
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210 | try { echo ok }
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211 |
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212 | failed (42)
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213 | echo status=$?
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214 |
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215 | try { echo ok }
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216 |
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217 | # Too many args
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218 | failed a b
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219 | echo status=$?
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220 |
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221 | ## STDOUT:
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222 | ok
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223 | status=2
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224 | ok
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225 | status=2
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226 | ## END
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227 |
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228 | #### failed builtin
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229 |
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230 | try {
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231 | echo hi
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232 | }
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233 | if failed {
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234 | echo 'should not get here'
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235 | } else {
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236 | echo 'ok 1'
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237 | }
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238 |
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239 | try {
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240 | #test -n ''
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241 |
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242 | # Hm json read sets the regular error
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243 | # Should we raise error.Structured?
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244 | #json read <<< '{'
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245 |
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246 | var x = fromJson('{')
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247 |
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248 | # Hm the error is in a SUBPROCESS HERE
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249 | #echo '{' | json read
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250 | }
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251 | if failed {
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252 | echo 'ok 2'
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253 | } else {
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254 | echo 'should not get here'
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255 | }
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256 |
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257 | ## STDOUT:
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258 | hi
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259 | ok 1
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260 | ok 2
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261 | ## END
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262 |
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263 |
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264 |
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