| 1 | ## compare_shells: dash bash zsh mksh ash yash
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| 2 | ## oils_failures_allowed: 0
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| 3 |
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| 4 | # forked from spec/ble-idioms
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| 5 | # the IFS= eval 'local x' bug
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| 6 |
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| 7 | #### More eval 'local v='
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| 8 | case $SH in mksh) exit ;; esac
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| 9 |
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| 10 | set -u
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| 11 |
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| 12 | f() {
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| 13 | # The temp env messes it up
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| 14 | tmp1= local x=x
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| 15 | tmp2= eval 'local y=y'
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| 16 |
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| 17 | # similar to eval
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| 18 | tmp3= . $REPO_ROOT/spec/testdata/define-local-var-z.sh
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| 19 |
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| 20 | # Bug does not appear with only eval
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| 21 | #eval 'local v=hello'
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| 22 |
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| 23 | #declare -p v
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| 24 | echo x=$x
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| 25 | echo y=$y
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| 26 | echo z=$z
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| 27 | }
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| 28 |
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| 29 | f
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| 30 |
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| 31 | ## STDOUT:
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| 32 | x=x
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| 33 | y=y
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| 34 | z=z
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| 35 | ## END
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| 36 |
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| 37 | ## N-I mksh STDOUT:
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| 38 | ## END
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| 39 |
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| 40 | #### Temp bindings with local
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| 41 |
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| 42 | f() {
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| 43 | local x=x
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| 44 | tmp='' local tx=tx
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| 45 |
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| 46 | # Hm both y and ty persist in bash/zsh
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| 47 | eval 'local y=y'
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| 48 | tmp='' eval 'local ty=ty'
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| 49 |
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| 50 | # Why does this have an effect in OSH? Oh because 'unset' is a special
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| 51 | # builtin
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| 52 | if true; then
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| 53 | x='X' unset x
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| 54 | tx='TX' unset tx
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| 55 | y='Y' unset y
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| 56 | ty='TY' unset ty
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| 57 | fi
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| 58 |
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| 59 | #unset y
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| 60 | #unset ty
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| 61 |
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| 62 | echo x=$x
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| 63 | echo tx=$tx
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| 64 | echo y=$y
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| 65 | echo ty=$ty
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| 66 | }
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| 67 |
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| 68 | f
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| 69 |
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| 70 | ## BUG bash/zsh STDOUT:
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| 71 | x=x
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| 72 | tx=tx
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| 73 | y=y
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| 74 | ty=ty
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| 75 | ## END
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| 76 |
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| 77 | ## STDOUT:
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| 78 | x=
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| 79 | tx=
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| 80 | y=
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| 81 | ty=
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| 82 | ## END
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| 83 |
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| 84 | #### Temp bindings with unset
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| 85 |
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| 86 | # key point:
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| 87 | # unset looks up the stack
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| 88 | # local doesn't though
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| 89 |
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| 90 | x=42
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| 91 | unset x
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| 92 | echo x=$x
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| 93 |
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| 94 | echo ---
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| 95 |
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| 96 | x=42
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| 97 | tmp= unset x
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| 98 | echo x=$x
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| 99 |
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| 100 | x=42
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| 101 | tmp= eval 'unset x'
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| 102 | echo x=$x
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| 103 |
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| 104 | echo ---
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| 105 |
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| 106 | shadow() {
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| 107 | x=42
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| 108 | x=tmp unset x
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| 109 | echo x=$x
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| 110 |
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| 111 | x=42
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| 112 | x=tmp eval 'unset x'
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| 113 | echo x=$x
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| 114 | }
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| 115 |
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| 116 | shadow
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| 117 |
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| 118 | echo ---
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| 119 |
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| 120 | case $SH in
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| 121 | bash) set -o posix ;;
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| 122 | esac
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| 123 | shadow
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| 124 |
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| 125 | # Now shadow
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| 126 |
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| 127 | # unset is a special builtin
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| 128 | # type unset
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| 129 |
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| 130 | ## STDOUT:
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| 131 | x=
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| 132 | ---
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| 133 | x=
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| 134 | x=
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| 135 | ---
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| 136 | x=42
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| 137 | x=42
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| 138 | ---
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| 139 | x=42
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| 140 | x=42
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| 141 | ## END
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| 142 |
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| 143 | ## BUG mksh/ash/dash/yash STDOUT:
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| 144 | x=
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| 145 | ---
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| 146 | x=
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| 147 | x=
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| 148 | ---
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| 149 | x=
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| 150 | x=
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| 151 | ---
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| 152 | x=
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| 153 | x=
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| 154 | ## END
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