| 1 | # Run with
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| 2 | #
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| 3 | # $ test/spec.sh nameref
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| 4 |
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| 5 | #### pass array by reference
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| 6 | show_value() {
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| 7 | local -n array_name=$1
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| 8 | local idx=$2
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| 9 | echo "${array_name[$idx]}"
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| 10 | }
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| 11 | shadock=(ga bu zo meu)
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| 12 | show_value shadock 2
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| 13 | ## stdout: zo
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| 14 |
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| 15 | #### mutate array by reference
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| 16 | set1() {
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| 17 | local -n array_name=$1
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| 18 | local val=$2
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| 19 | array_name[1]=$val
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| 20 | }
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| 21 | shadock=(a b c d)
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| 22 | set1 shadock ZZZ
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| 23 | echo ${shadock[@]}
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| 24 | ## STDOUT:
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| 25 | a ZZZ c d
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| 26 | ## END
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| 27 |
|
| 28 | #### pass assoc array by reference
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| 29 | show_value() {
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| 30 | local -n array_name=$1
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| 31 | local idx=$2
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| 32 | echo "${array_name[$idx]}"
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| 33 | }
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| 34 | days=([monday]=eggs [tuesday]=bread [sunday]=jam)
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| 35 | show_value days sunday
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| 36 | ## stdout: jam
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| 37 | ## BUG mksh stdout: [monday]=eggs
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| 38 | # mksh note: it coerces "days" to 0? Horrible.
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| 39 |
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| 40 | #### pass local array by reference, relying on DYNAMIC SCOPING
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| 41 | show_value() {
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| 42 | local -n array_name=$1
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| 43 | local idx=$2
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| 44 | echo "${array_name[$idx]}"
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| 45 | }
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| 46 | caller() {
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| 47 | local shadock=(ga bu zo meu)
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| 48 | show_value shadock 2
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| 49 | }
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| 50 | caller
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| 51 | ## stdout: zo
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| 52 | # mksh appears not to have local arrays!
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| 53 | ## BUG mksh stdout-json: ""
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| 54 | ## BUG mksh status: 1
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| 55 |
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| 56 |
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| 57 | #### flag -n and +n
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| 58 | x=foo
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| 59 |
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| 60 | ref=x
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| 61 |
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| 62 | echo ref=$ref
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| 63 |
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| 64 | typeset -n ref
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| 65 | echo ref=$ref
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| 66 |
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| 67 | # mutate underlying var
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| 68 | x=bar
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| 69 | echo ref=$ref
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| 70 |
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| 71 | typeset +n ref
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| 72 | echo ref=$ref
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| 73 |
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| 74 | ## STDOUT:
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| 75 | ref=x
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| 76 | ref=foo
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| 77 | ref=bar
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| 78 | ref=x
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| 79 | ## END
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| 80 |
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| 81 | #### mutating through nameref: ref=
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| 82 | x=XX
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| 83 | y=YY
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| 84 |
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| 85 | ref=x
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| 86 | ref=y
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| 87 | echo 1 ref=$ref
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| 88 |
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| 89 | # now it's a reference
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| 90 | typeset -n ref
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| 91 |
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| 92 | echo 2 ref=$ref # prints YY
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| 93 |
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| 94 | ref=XXXX
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| 95 | echo 3 ref=$ref # it actually prints y, which is XXXX
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| 96 |
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| 97 | # now Y is mutated!
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| 98 | echo 4 y=$y
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| 99 |
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| 100 | ## STDOUT:
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| 101 | 1 ref=y
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| 102 | 2 ref=YY
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| 103 | 3 ref=XXXX
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| 104 | 4 y=XXXX
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| 105 | ## END
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| 106 |
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| 107 |
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| 108 | #### flag -n combined ${!ref} -- bash INVERTS
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| 109 | foo=FOO # should NOT use this
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| 110 |
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| 111 | x=foo
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| 112 | ref=x
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| 113 |
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| 114 | echo ref=$ref
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| 115 | echo "!ref=${!ref}"
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| 116 |
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| 117 | echo 'NOW A NAMEREF'
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| 118 |
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| 119 | typeset -n ref
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| 120 | echo ref=$ref
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| 121 | echo "!ref=${!ref}"
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| 122 |
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| 123 | ## STDOUT:
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| 124 | ref=x
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| 125 | !ref=foo
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| 126 | NOW A NAMEREF
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| 127 | ref=foo
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| 128 | !ref=x
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| 129 | ## END
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| 130 | ## N-I mksh STDOUT:
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| 131 | ref=x
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| 132 | !ref=ref
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| 133 | NOW A NAMEREF
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| 134 | ref=foo
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| 135 | !ref=x
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| 136 | ## END
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| 137 |
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| 138 | #### named ref with $# doesn't work
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| 139 | set -- one two three
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| 140 |
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| 141 | ref='#'
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| 142 | echo ref=$ref
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| 143 | typeset -n ref
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| 144 | echo ref=$ref
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| 145 |
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| 146 | ## STDOUT:
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| 147 | ref=#
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| 148 | ref=#
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| 149 | ## END
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| 150 |
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| 151 | # mksh does respect it!! Gah.
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| 152 | ## OK mksh STDOUT:
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| 153 | ref=#
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| 154 | ref=3
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| 155 | ## END
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| 156 |
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| 157 |
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| 158 | #### named ref with $# and shopt -s strict_nameref
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| 159 | shopt -s strict_nameref
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| 160 |
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| 161 | ref='#'
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| 162 | echo ref=$ref
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| 163 | typeset -n ref
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| 164 | echo ref=$ref
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| 165 | ## STDOUT:
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| 166 | ref=#
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| 167 | ## END
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| 168 | ## status: 1
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| 169 | ## N-I bash status: 0
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| 170 | ## N-I bash STDOUT:
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| 171 | ref=#
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| 172 | ref=#
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| 173 | ## END
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| 174 | ## N-I mksh status: 0
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| 175 | ## N-I mksh STDOUT:
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| 176 | ref=#
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| 177 | ref=0
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| 178 | ## END
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| 179 |
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| 180 | #### named ref with 1 $1 etc.
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| 181 | set -- one two three
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| 182 |
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| 183 | x=X
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| 184 |
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| 185 | ref='1'
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| 186 | echo ref=$ref
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| 187 | typeset -n ref
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| 188 | echo ref=$ref
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| 189 |
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| 190 | # BUG: This is really assigning '1', which is INVALID
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| 191 | # with strict_nameref that degrades!!!
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| 192 | ref2='$1'
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| 193 | echo ref2=$ref2
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| 194 | typeset -n ref2
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| 195 | echo ref2=$ref2
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| 196 |
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| 197 | x=foo
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| 198 |
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| 199 | ref3='x'
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| 200 | echo ref3=$ref3
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| 201 | typeset -n ref3
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| 202 | echo ref3=$ref3
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| 203 |
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| 204 | ## STDOUT:
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| 205 | ref=1
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| 206 | ref=1
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| 207 | ref2=$1
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| 208 | ref2=$1
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| 209 | ref3=x
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| 210 | ref3=foo
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| 211 | ## END
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| 212 | ## BUG mksh status: 1
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| 213 | ## BUG mksh STDOUT:
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| 214 | ref=1
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| 215 | ref=one
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| 216 | ref2=$1
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| 217 | ## END
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| 218 |
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| 219 | #### assign to invalid ref
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| 220 | ref=1 # mksh makes this READ-ONLY! Because it's not valid.
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| 221 |
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| 222 | echo ref=$ref
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| 223 | typeset -n ref
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| 224 | echo ref=$ref
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| 225 |
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| 226 | ref=foo
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| 227 | echo ref=$ref
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| 228 | ## STDOUT:
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| 229 | ref=1
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| 230 | ref=1
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| 231 | ref=foo
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| 232 | ## END
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| 233 | ## OK mksh status: 2
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| 234 | ## OK mksh STDOUT:
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| 235 | ref=1
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| 236 | ref=
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| 237 | ## END
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| 238 |
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| 239 | #### assign to invalid ref with strict_nameref
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| 240 | case $SH in *bash|*mksh) exit ;; esac
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| 241 |
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| 242 | shopt -s strict_nameref
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| 243 |
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| 244 | ref=1
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| 245 |
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| 246 | echo ref=$ref
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| 247 | typeset -n ref
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| 248 | echo ref=$ref
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| 249 |
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| 250 | ref=foo
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| 251 | echo ref=$ref
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| 252 | ## status: 1
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| 253 | ## STDOUT:
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| 254 | ref=1
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| 255 | ## END
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| 256 | ## N-I bash/mksh status: 0
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| 257 | ## N-I bash/mksh stdout-json: ""
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| 258 |
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| 259 | #### name ref on Undef cell
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| 260 | typeset -n ref
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| 261 |
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| 262 | # This is technically incorrect: an undefined name shouldn't evaluate to empty
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| 263 | # string. mksh doesn't allow it.
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| 264 | echo ref=$ref
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| 265 |
|
| 266 | echo nounset
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| 267 | set -o nounset
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| 268 | echo ref=$ref
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| 269 | ## status: 1
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| 270 | ## STDOUT:
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| 271 | ref=
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| 272 | nounset
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| 273 | ## END
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| 274 | ## OK mksh stdout-json: ""
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| 275 |
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| 276 | #### assign to empty nameref and invalid nameref
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| 277 | typeset -n ref
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| 278 | echo ref=$ref
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| 279 |
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| 280 | # this is a no-op in bash, should be stricter
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| 281 | ref=x
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| 282 | echo ref=$ref
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| 283 |
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| 284 | typeset -n ref2=undef
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| 285 | echo ref2=$ref2
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| 286 | ref2=x
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| 287 | echo ref2=$ref2
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| 288 |
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| 289 | ## STDOUT:
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| 290 | ref=
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| 291 | ref=
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| 292 | ref2=
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| 293 | ref2=x
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| 294 | ## END
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| 295 |
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| 296 | # mksh gives a good error: empty nameref target
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| 297 | ## OK mksh status: 1
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| 298 | ## OK mksh stdout-json: ""
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| 299 |
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| 300 | #### -n attribute before it has a value
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| 301 | typeset -n ref
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| 302 |
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| 303 | echo ref=$ref
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| 304 |
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| 305 | # Now that it's a string, it still has the -n attribute
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| 306 | x=XX
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| 307 | ref=x
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| 308 | echo ref=$ref
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| 309 |
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| 310 | ## STDOUT:
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| 311 | ref=
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| 312 | ref=XX
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| 313 | ## END
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| 314 | ## N-I mksh status: 1
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| 315 | ## N-I mksh stdout-json: ""
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| 316 |
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| 317 | #### -n attribute on array is hard error, not a warning
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| 318 | x=X
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| 319 | typeset -n ref #=x
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| 320 | echo hi
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| 321 |
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| 322 | # bash prints warning: REMOVES the nameref attribute here!
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| 323 | ref=(x y)
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| 324 | echo ref=$ref
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| 325 |
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| 326 | ## status: 1
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| 327 | ## STDOUT:
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| 328 | hi
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| 329 | ## END
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| 330 | ## N-I mksh status: 1
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| 331 | ## N-I mksh stdout-json: ""
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| 332 | ## BUG bash status: 0
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| 333 | ## BUG bash STDOUT:
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| 334 | hi
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| 335 | ref=x
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| 336 | ## END
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| 337 |
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| 338 | #### exported nameref
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| 339 | x=foo
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| 340 | typeset -n -x ref=x
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| 341 |
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| 342 | # hm bash ignores it but mksh doesn't. maybe disallow it.
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| 343 | printenv.py x ref
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| 344 | echo ---
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| 345 | export x
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| 346 | printenv.py x ref
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| 347 | ## STDOUT:
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| 348 | None
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| 349 | x
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| 350 | ---
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| 351 | foo
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| 352 | x
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| 353 | ## END
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| 354 | ## OK mksh STDOUT:
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| 355 | None
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| 356 | None
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| 357 | ---
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| 358 | foo
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| 359 | None
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| 360 | ## END
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| 361 |
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| 362 |
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| 363 | #### readonly nameref doesn't prevent assigning through it
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| 364 |
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| 365 | # hm bash also ignores -r when -n is set
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| 366 |
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| 367 | x=XX
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| 368 | typeset -n -r ref=x
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| 369 |
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| 370 | echo ref=$ref
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| 371 |
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| 372 | # it feels like I shouldn't be able to mutate this?
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| 373 | ref=XXXX
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| 374 | echo ref=$ref
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| 375 |
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| 376 | x=X
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| 377 | echo x=$x
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| 378 |
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| 379 | ## STDOUT:
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| 380 | ref=XX
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| 381 | ref=XXXX
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| 382 | x=X
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| 383 | ## END
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| 384 |
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| 385 | #### readonly var can't be assigned through nameref
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| 386 |
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| 387 | x=X
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| 388 | typeset -n -r ref=x
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| 389 |
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| 390 | echo ref=$ref
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| 391 |
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| 392 | # it feels like I shouldn't be able to mutate this?
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| 393 | ref=XX
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| 394 | echo ref=$ref
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| 395 |
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| 396 | # now the underling variable is immutable
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| 397 | typeset -r x
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| 398 |
|
| 399 | ref=XXX
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| 400 | echo ref=$ref
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| 401 | echo x=$x
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| 402 |
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| 403 | ## status: 1
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| 404 | ## OK mksh status: 2
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| 405 | ## STDOUT:
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| 406 | ref=X
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| 407 | ref=XX
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| 408 | ## END
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| 409 |
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| 410 | ## OK bash status: 0
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| 411 | ## OK bash STDOUT:
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| 412 | ref=X
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| 413 | ref=XX
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| 414 | ref=XX
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| 415 | x=XX
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| 416 | ## END
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| 417 |
|
| 418 | #### unset nameref
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| 419 | x=X
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| 420 | typeset -n ref=x
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| 421 | echo ref=$ref
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| 422 |
|
| 423 | # this works
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| 424 | unset ref
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| 425 | echo ref=$ref
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| 426 | echo x=$x
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| 427 |
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| 428 | ## STDOUT:
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| 429 | ref=X
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| 430 | ref=
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| 431 | x=
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| 432 | ## END
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| 433 |
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| 434 | #### Chain of namerefs
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| 435 | x=foo
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| 436 | typeset -n ref=x
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| 437 | typeset -n ref_to_ref=ref
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| 438 | echo ref_to_ref=$ref_to_ref
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| 439 | echo ref=$ref
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| 440 | ## STDOUT:
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| 441 | ref_to_ref=foo
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| 442 | ref=foo
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| 443 | ## END
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| 444 |
|
| 445 | #### Mutually recursive namerefs detected on READ
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| 446 | typeset -n ref1=ref2
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| 447 | typeset -n ref2=ref1
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| 448 | echo defined
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| 449 | echo ref1=$ref1
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| 450 | echo ref2=$ref1
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| 451 | ## status: 1
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| 452 | ## STDOUT:
|
| 453 | defined
|
| 454 | ## END
|
| 455 | ## OK mksh stdout-json: ""
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| 456 | ## BUG bash status: 0
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| 457 | ## BUG bash STDOUT:
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| 458 | defined
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| 459 | ref1=
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| 460 | ref2=
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| 461 | ## END
|
| 462 |
|
| 463 | #### Mutually recursive namerefs detected on WRITE
|
| 464 | typeset -n ref1=ref2
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| 465 | typeset -n ref2=ref1 # not detected here
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| 466 | echo defined $?
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| 467 | ref1=z # detected here
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| 468 | echo mutated $?
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| 469 | ## status: 1
|
| 470 | ## STDOUT:
|
| 471 | defined 0
|
| 472 | ## END
|
| 473 | ## OK mksh stdout-json: ""
|
| 474 | ## BUG bash status: 0
|
| 475 | ## BUG bash STDOUT:
|
| 476 | defined 0
|
| 477 | mutated 1
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| 478 | ## END
|
| 479 |
|
| 480 | #### Dynamic scope with namerefs
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| 481 |
|
| 482 | f3() {
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| 483 | local -n ref=$1
|
| 484 | ref=x
|
| 485 | }
|
| 486 |
|
| 487 | f2() {
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| 488 | f3 "$@"
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| 489 | }
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| 490 |
|
| 491 | f1() {
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| 492 | local F1=F1
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| 493 | echo F1=$F1
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| 494 | f2 F1
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| 495 | echo F1=$F1
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| 496 | }
|
| 497 | f1
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| 498 |
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| 499 | ## STDOUT:
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| 500 | F1=F1
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| 501 | F1=x
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| 502 | ## END
|
| 503 |
|
| 504 |
|
| 505 | #### change reference itself
|
| 506 | x=XX
|
| 507 | y=YY
|
| 508 | typeset -n ref=x
|
| 509 | echo ref=$ref
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| 510 | echo x=$x
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| 511 | echo y=$y
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| 512 |
|
| 513 | echo ----
|
| 514 | typeset -n ref=y
|
| 515 | echo ref=$ref
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| 516 | echo x=$x
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| 517 | echo y=$y
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| 518 | echo ----
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| 519 | ref=z
|
| 520 | echo ref=$ref
|
| 521 | echo x=$x
|
| 522 | echo y=$y
|
| 523 |
|
| 524 | ## STDOUT:
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| 525 | ref=XX
|
| 526 | x=XX
|
| 527 | y=YY
|
| 528 | ----
|
| 529 | ref=YY
|
| 530 | x=XX
|
| 531 | y=YY
|
| 532 | ----
|
| 533 | ref=z
|
| 534 | x=XX
|
| 535 | y=z
|
| 536 | ## END
|
| 537 |
|
| 538 | #### a[2] in nameref
|
| 539 |
|
| 540 | typeset -n ref='a[2]'
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| 541 | a=(zero one two three)
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| 542 | echo ref=$ref
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| 543 | ## STDOUT:
|
| 544 | ref=two
|
| 545 | ## END
|
| 546 |
|
| 547 | #### a[expr] in nameref
|
| 548 |
|
| 549 | # this confuses code and data
|
| 550 | typeset -n ref='a[$(echo 2) + 1]'
|
| 551 | a=(zero one two three)
|
| 552 | echo ref=$ref
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| 553 | ## STDOUT:
|
| 554 | ref=three
|
| 555 | ## END
|
| 556 |
|
| 557 | #### a[@] in nameref
|
| 558 |
|
| 559 | # this confuses code and data
|
| 560 | typeset -n ref='a[@]'
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| 561 | a=('A B' C)
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| 562 | argv.py ref "$ref" # READ through ref works
|
| 563 | ref=(X Y Z) # WRITE through doesn't work
|
| 564 | echo status=$?
|
| 565 | argv.py 'ref[@]' "${ref[@]}"
|
| 566 | argv.py ref "$ref" # JOINING mangles the array?
|
| 567 | argv.py 'a[@]' "${a[@]}"
|
| 568 | ## STDOUT:
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| 569 | ['ref', 'A B C']
|
| 570 | status=1
|
| 571 | ['ref[@]']
|
| 572 | ['ref', 'A B C']
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| 573 | ['a[@]', 'A B', 'C']
|
| 574 | ## END
|
| 575 | ## OK mksh status: 1
|
| 576 | ## OK mksh stdout-json: ""
|
| 577 |
|
| 578 | #### mutate through nameref: ref[0]=
|
| 579 |
|
| 580 | # This is DIFFERENT than the nameref itself being 'array[0]' !
|
| 581 |
|
| 582 | array=(X Y Z)
|
| 583 | typeset -n ref=array
|
| 584 | ref[0]=xx
|
| 585 | echo ${array[@]}
|
| 586 | ## STDOUT:
|
| 587 | xx Y Z
|
| 588 | ## END
|
| 589 |
|
| 590 | #### bad mutation through nameref: ref[0]= where ref is array[0]
|
| 591 | array=(X Y Z)
|
| 592 | typeset -n ref='array[0]'
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| 593 | ref[0]=foo # error in bash: 'array[0]': not a valid identifier
|
| 594 | echo status=$?
|
| 595 | echo ${array[@]}
|
| 596 | ## STDOUT:
|
| 597 | status=1
|
| 598 | X Y Z
|
| 599 | ## END
|
| 600 | ## BUG mksh STDOUT:
|
| 601 | status=0
|
| 602 | foo Y Z
|
| 603 | ## END
|
| 604 |
|
| 605 | #### @ in nameref isn't supported, unlike in ${!ref}
|
| 606 |
|
| 607 | set -- A B
|
| 608 | typeset -n ref='@' # bash gives an error here
|
| 609 | echo status=$?
|
| 610 |
|
| 611 | echo ref=$ref # bash doesn't give an error here
|
| 612 | echo status=$?
|
| 613 | ## status: 1
|
| 614 | ## stdout-json: ""
|
| 615 | ## OK bash status: 0
|
| 616 | ## OK bash STDOUT:
|
| 617 | status=1
|
| 618 | ref=
|
| 619 | status=0
|
| 620 | ## END
|
| 621 |
|
| 622 | #### Unquoted assoc reference on RHS
|
| 623 | typeset -A bashup_ev_r
|
| 624 | bashup_ev_r['foo']=bar
|
| 625 |
|
| 626 | p() {
|
| 627 | local s=foo
|
| 628 | local -n e=bashup_ev["$s"] f=bashup_ev_r["$s"]
|
| 629 | # Different!
|
| 630 | #local e=bashup_ev["$s"] f=bashup_ev_r["$s"]
|
| 631 | argv.py "$f"
|
| 632 | }
|
| 633 | p
|
| 634 | ## STDOUT:
|
| 635 | ['bar']
|
| 636 | ## END
|
| 637 | ## N-I mksh stdout-json: ""
|
| 638 | ## N-I mksh status: 1
|