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Command not found error with "=" prefix

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From: Ismail Donmez <ismail@xxxxxxxx>
To: zsh-workers@xxxxxxx
Subject: Command not found error with "=" prefix
Date: Fri, 16 Oct 2015 11:15:01 +0000 (UTC)
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Hi,

If you prefix a command with "=" and the application returns an error then 
zsh also displays a command not found error:

λ echo $ZSH_VERSION 
5.1.1

λ =true
λ

No error, fine.

λ =false
=false: command not found 

false does exist though:

λ type -a false
false is a shell builtin
false is /usr/bin/false
false is /usr/bin/false
false is /usr/bin/false
false is /bin/false
false is /usr/bin/X11/false

Also reproducable with other programs:

λ =clang -fuse-ld=lld2 test.c -lm
unrecognized reloc 23
clang-3.8: error: linker command failed with exit code 1 (use -v to see 
invocation)
=clang: command not found

Follow-Ups:
- Re: Command not found error with "=" prefix
  - From: Peter Stephenson

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