>(Process substitution) utterly b0rken

[Martijn Dekker]

Yikes. Here's one whopper of a ksh93 bug that I just found, in 2011 and
2012 release versions:

Process substitution of the form >(list) is utterly broken:

$ echo ok > >(sed s/ok/good/)

Expected output: "good" (as on bash and zsh)

Actual output:
* either none, with a file with a bizarre binary file name created
in the current working directory that contains $'ok\n'
(which is what happens on Linux and Solaris);
* or (depending on the file system and/or OS and/or locale) an
error message indicating the refusal to create that file:
ksh: ?: cannot create [Illegal byte sequence]
(which is what happens on my Mac).

Before I spend hours searching for the cause, does anyone have any idea
where to begin debugging this?

- Martijn

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