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References: <etPan.5a107666.74b42c6c.137@zdharma.org> <etPan.5a107a4b.459f7f60.137@zdharma.org>
 <etPan.5a10805d.57d72d7c.137@AirmailxGenerated.am> <etPan.5a1950df.46f9693d.c73c@zdharma.org>
 <etPan.5a23bfae.35a1d3d8.c73c@zdharma.org> <20171205065518.GA7087@chaz.gmail.com>
From: "Tom M." <boojum@stercus-accidit.com>
Date: Tue, 5 Dec 2017 08:06:37 +0000
Message-ID: <CACfAdfYgAjNR7AWTLtF=zLMF5vOgOpzxJHQznf1K-O=YX797ww@mail.gmail.com>
Subject: =?UTF-8?Q?Re=3A_Ternary_expression_in_Zsh_=28was=3A_Feature_request_?=
	=?UTF-8?Q?=E2=80=93_substitutions_similar_to_=2B=2C_=2D=2C_=3A=2B=2C_=3A=2D=29?=
To: Sebastian Gniazdowski <psprint@zdharma.org>, Bart Schaefer <schaefer@brasslantern.com>, 
	"zsh-workers@zsh.org" <zsh-workers@zsh.org>
Content-Type: text/plain; charset="UTF-8"

> $ true; echo ${${=:-green red}[2-!?]}
> green
> $ false; echo ${${=:-green red}[2-!?]}
> red

The above fails for me:
% true; echo ${${=:-green red}[2-!?]}
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\24\0\0\0\0\0?\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource
temporarily unavailable)
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\25\0\0\0\0\0@\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource
temporarily unavailable)
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\26\0\0\0\0\0A\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource
temporarily unavailable)
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\27\0\0\0\0\0B\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource
temporarily unavailable)
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\30\0\0\0\0\0C\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\31\0\0\0\0\0D\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\32\0\0\0\0\0E\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\34\0\0\0\0\0G\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource
temporarily unavailable)
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\35\0\0\0\0\0H\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource
temporarily unavailable)
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\36\0\0\0\0\0I\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource
temporarily unavailable)
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\37\0\0\0\0\0J\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource
temporarily unavailable)
recvmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\1\0
\0\0\0\0\0K\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource
temporarily unavailable)
recvmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\1\0,
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0)

And if run from zsh -f:
% true; echo ${${=:-green red}[2-!?]}
zsh: no such event: ]}

Any idea what can be responsible for this?


--
T.