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/usr/share/zsh/help/eval is in zsh-common 5.3.1-4.

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eval [ arg ... ]
       Read the arguments as input to the shell and execute the result-
       ing command(s) in the current shell process.  The return  status
       is the same as if the commands had been executed directly by the
       shell; if there are no args or they contain  no  commands  (i.e.
       are an empty string or whitespace) the return status is zero.