1 | # spec/ysh-builtin-error
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2 |
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3 | ## our_shell: ysh
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4 | ## oils_failures_allowed: 1
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5 |
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6 | #### try requires an argument
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7 |
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8 | try
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9 | echo status=$?
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10 |
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11 | ## status: 3
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12 | ## STDOUT:
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13 | ## END
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14 |
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15 | #### User errors behave like builtin errors
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16 | func divide(a, b) {
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17 | if (b === 0) {
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18 | error 'divide by zero' (code=3)
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19 | }
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20 |
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21 | return (a / b)
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22 | }
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23 |
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24 | # errors can be caught with try
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25 | try { = divide(42, 0) }
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26 | echo status=$_status
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27 |
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28 | = divide(42, 0)
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29 |
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30 | ## status: 3
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31 | ## STDOUT:
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32 | status=3
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33 | ## END
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34 |
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35 | #### _error register is initially empty dict
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36 |
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37 | echo $[type(_error)]
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38 | echo $[len(_error)]
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39 |
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40 | ## STDOUT:
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41 | Dict
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42 | 0
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43 | ## END
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44 |
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45 | #### error builtin sets _error.message, which can be used by programs
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46 |
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47 | func divide(a, b) {
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48 | if (b === 0) {
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49 | error "divide by zero: $a / $b" (code=3)
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50 | }
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51 | return (a / b)
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52 | }
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53 |
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54 | try { = divide(42, 0) }
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55 | echo status=$_status
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56 | echo message=$[_error.message]
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57 |
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58 | proc p {
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59 | echo $[divide(5, 0)]
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60 | }
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61 |
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62 | try { p }
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63 | echo status=$_status
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64 | echo message=$[_error.message]
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65 |
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66 | ## STDOUT:
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67 | status=3
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68 | message=divide by zero: 42 / 0
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69 | status=3
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70 | message=divide by zero: 5 / 0
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71 | ## END
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72 |
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73 | #### error builtin adds named args as properties on _error Dict
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74 |
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75 | try {
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76 | error 'bad' (code=99)
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77 | }
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78 | pp line (_error)
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79 |
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80 | # Note: myData co
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81 | try {
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82 | error 'bad' (code=99, myData={spam:'eggs'})
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83 | }
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84 | pp line (_error)
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85 |
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86 | try {
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87 | error 'bad' (code=99, message='cannot override')
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88 | }
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89 | pp line (_error)
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90 |
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91 | ## STDOUT:
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92 | (Dict) {"code":99,"message":"bad"}
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93 | (Dict) {"myData":{"spam":"eggs"},"code":99,"message":"bad"}
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94 | (Dict) {"message":"bad","code":99}
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95 | ## END
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96 |
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97 | #### Errors within multiple functions
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98 | func inverse(x) {
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99 | if (x === 0) {
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100 | error '0 does not have an inverse' # default status is 1
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101 | }
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102 |
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103 | return (1 / x)
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104 | }
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105 |
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106 | func invertList(list) {
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107 | var result = []
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108 | for item in (list) {
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109 | call result->append(inverse(item))
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110 | }
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111 | return (result)
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112 | }
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113 |
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114 | = invertList([1, 2, 0])
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115 | ## status: 10
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116 | ## STDOUT:
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117 | ## END
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118 |
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119 | #### Impact of errors on var declaration
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120 | func alwaysError() {
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121 | error "it's an error" (status=100)
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122 | }
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123 |
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124 | try {
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125 | var mylist = [1 + 2, alwaysError()]
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126 |
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127 | echo this will never be printed
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128 | }
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129 | = mylist # undefined! status becomes 1
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130 | ## status: 1
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131 | ## STDOUT:
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132 | ## END
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133 |
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134 | #### default error code is 10
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135 | error 'some error'
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136 | ## status: 10
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137 | ## STDOUT:
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138 | ## END
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139 |
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140 | #### error code should be an integer
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141 | error 'error' (code='a string?')
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142 | ## status: 3
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143 | ## STDOUT:
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144 | ## END
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145 |
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146 | #### Error code should be named arg, not positional
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147 | error msg (100)
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148 | ## status: 3
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149 | ## STDOUT:
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150 | ## END
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151 |
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152 | #### error cannot take word args
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153 | error uh-oh ('error', status=1)
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154 | ## status: 3
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155 | ## STDOUT:
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156 | ## END
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157 |
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158 | #### error requires arguments
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159 | error
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160 | ## status: 2
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161 | ## STDOUT:
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162 | ## END
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163 |
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164 | #### error cannot have a code of 0
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165 | error ('error', code=0)
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166 | ## status: 2
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167 | ## STDOUT:
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168 | ## END
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169 |
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170 | #### try { error oops }
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171 |
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172 | try { error oops }
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173 | echo status=$_status
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174 |
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175 | ## STDOUT:
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176 | status=10
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177 | ## END
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178 |
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179 | #### Handle _error.code
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180 |
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181 | proc failing {
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182 | error 'failed' (code=99)
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183 | }
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184 |
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185 | try {
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186 | failing
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187 | }
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188 | if (_error.code === 99) {
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189 | echo PASS
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190 | }
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191 |
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192 | try {
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193 | failing
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194 | }
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195 | case (_error.code) {
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196 | (0) { echo success }
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197 | (1) { echo one }
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198 | (else) { echo CASE PASS }
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199 | }
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200 |
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201 | ## STDOUT:
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202 | PASS
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203 | CASE PASS
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204 | ## END
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205 |
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206 |
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207 | #### failed builtin usage
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208 |
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209 | set +o errexit
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210 |
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211 | try { echo ok }
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212 |
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213 | failed (42)
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214 | echo status=$?
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215 |
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216 | try { echo ok }
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217 |
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218 | # Too many args
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219 | failed a b
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220 | echo status=$?
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221 |
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222 | ## STDOUT:
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223 | ok
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224 | status=2
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225 | ok
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226 | status=2
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227 | ## END
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228 |
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229 | #### failed builtin
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230 |
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231 | try {
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232 | echo hi
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233 | }
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234 | if failed {
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235 | echo 'should not get here'
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236 | } else {
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237 | echo 'ok 1'
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238 | }
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239 |
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240 | try {
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241 | #test -n ''
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242 |
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243 | # Hm json read sets the regular error
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244 | # Should we raise error.Structured?
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245 | #json read <<< '{'
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246 |
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247 | var x = fromJson('{')
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248 |
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249 | # Hm the error is in a SUBPROCESS HERE
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250 | #echo '{' | json read
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251 | }
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252 | if failed {
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253 | echo 'ok 2'
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254 | } else {
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255 | echo 'should not get here'
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256 | }
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257 |
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258 | ## STDOUT:
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259 | hi
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260 | ok 1
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261 | ok 2
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262 | ## END
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263 |
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264 |
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265 |
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