Cannot expand ${0_1}
I'm not sure if the paraneter name 0_1 is acceptable or not in the first place, but the current behavior is inconsistent anyway.
$ typeset 0_1=foo $ export 0_1 $ printenv 0_1 foo $ echo ${0_1?} yash: parameter `0_1' is not set
Moved to https://github.com/magicant/yash/issues/29
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I'm not sure if the paraneter name 0_1 is acceptable or not in the first place, but the current behavior is inconsistent anyway.
$ typeset 0_1=foo $ export 0_1 $ printenv 0_1 foo $ echo ${0_1?} yash: parameter `0_1' is not set