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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <160205104314.ZM29996@torch.brasslantern.com>
Date: Fri, 5 Feb 2016 10:43:14 -0800
In-Reply-To: <CAKc7PVBeEpTN9jTg9HQE_ycuOP+jFGEFQZ4hoz8oT8LRDogcYg@mail.gmail.com>
Comments: In reply to Sebastian Gniazdowski <sgniazdowski@gmail.com>
        "Re: Compiled files ignore aliases" (Feb  5,  6:24pm)
References: <CAKc7PVDKxBdZ+9teFDS+Zd3VCvr_JYTpiGtYNuyRicAUfPa4KA@mail.gmail.com> 
	<160205083708.ZM29641@torch.brasslantern.com> 
	<CAKc7PVBeEpTN9jTg9HQE_ycuOP+jFGEFQZ4hoz8oT8LRDogcYg@mail.gmail.com>
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To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Compiled files ignore aliases
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On Feb 5,  6:24pm, Sebastian Gniazdowski wrote:
}
} Yes I thought about it and it's reasonable, though unsymmetrical. Zwc
} changes things, there isn't full symmetry when sourcing file already
} parsed or not, but see *. The "reasonable" is that parsing probably
} does lookup each word in a hash table to see if there is an alias for
} it. Compiling means skipping that time consuming process.

By analogy, "alias" in shell is more like "#define" in C.  Once you've
compiled, the macro expansion is already done and doesn't happen again.

You can intentionally trigger alias expansion by using "eval", which is
(in this analogy) re-compiling at run time.