Pre-command parameter assignments affect command lookup?

[Clint Hepner <clint.hepner@xxxxxxxxx>]

I was surprised by the following:

    # Rationale: I wanted the man page for /usr/local/bin/bash, which comes
    # after /bin/bash in my path.
    % PATH=/usr/local/bin man bash
    zsh: command not found: man

The value of `PATH` is incorrectly modified in the current shell before
`man` is executed (indeed, it prevents the execution from happening because
the command cannot be found).

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Clint