[Bug 1951155] Re: export i fails to work in bash

[ytxmobile]

Still happening in 22.04 LTS.

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https://bugs.launchpad.net/bugs/1951155

Title:
  export i fails to work in bash

Status in bash package in Ubuntu:
  Confirmed

Bug description:
  I ran the following commands:
  ```
  # In parent shell
  export a=1
  export i=2
  bash # open child shell
  # In child shell
  echo $a # 1
  echo $i # (empty)
  exit
  ```

  This bug happens when exporting the "i" variable from parent shell to child shell.
  I have not tested what other variable names would trigger this bug.

  * My OS: Ubuntu 20.04 LTS
  * Bash version (running `bash --version`):
  ```
  GNU bash, version 5.0.17(1)-release (x86_64-pc-linux-gnu)
  Copyright (C) 2019 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

  This is free software; you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.
  ```

  I have also tested in the `sh` shell and did not see the problem:
  ```
  # In parent shell
  export a=1
  export i=2
  sh # open child shell
  # In child shell
  echo $a # 1
  echo $i # 2
  exit
  ```

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