zsh ignores aliases when using exec precommand

[Dominique Devriese]

Binary package hint: zsh

I have the following in my ~/.zshrc: "alias ec='emacsclient'"
When I execute "ec -nc" in an interactive session, this does what I want it to do, but when I do "exec ec -nc", nothing happens and the shell exits. When I do "exec ec -nc &> /tmp/test.out", the file /tmp/test.out contains "zsh: command not found: ec".
What I expected to happen was that emacsclient would be executed (replacing the zsh process), and passed the parameters "-nc".

Some data:
domi@arial:~> lsb_release -rd
Description: Ubuntu 9.10
Release: 9.10
domi@arial:~> apt-cache policy zsh
zsh:
  Geïnstalleerd: 4.3.10-5ubuntu1
  Kandidaat: 4.3.10-5ubuntu1
  Versietabel:
     4.3.10-6 0
        650 http://ftp.us.debian.org testing/main Packages
 *** 4.3.10-5ubuntu1 0
        701 http://be.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status
     4.3.6-6 0
        700 http://ftp.us.debian.org stable/main Packages

ProblemType: Bug
Architecture: i386
Date: Tue Nov 17 17:16:27 2009
DistroRelease: Ubuntu 9.10
Package: zsh 4.3.10-5ubuntu1
ProcEnviron:
 PATH=(custom, user)
 LANG=nl_BE.UTF-8
 SHELL=/usr/bin/zsh
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: zsh
Uname: Linux 2.6.31-14-generic i686
XsessionErrors:
 (firefox:1706): Gdk-WARNING **: XID collision, trouble ahead
 (firefox:1706): Gdk-WARNING **: XID collision, trouble ahead