BUG: $_ empty on null function call

[Micah Waddoups <micah@askmicah.net>]

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Hello all,
   I am still a beginner in developing, or I would tackle this issue 
directly myself.  The misbehavior is when the command list has a null 
function with parameters, the last-command-last-parameter ($_) built-in 
variable goes blank.  Example:

|local a=1 b=2 c=3; : One; function { : Two; echo $_; print -l $argv; } 
$_ Three; print -l $_ Four;
## Should print:
#  Two
#  One
#  Three
#  Three
#  Four

## Currently prints:
#  Two
#  Three
#  Four

## Conversely, when no arguments are given to the null function,
## it operates mostly normally, but as if the function were not there:|
||local a=1 b=2 c=3; : One; function { : Two; echo $_; print -l $argv; 
}; print -l $_ Four;|
## Outputs:
#  Two
#
#  One
#  Four
##     ( second line is 'print -l' but $argv is empty
|

   It would seem this unexpected behavior may be the result of an 
unfinished shell source where the best shell behavior was not clear to 
the programmer.  I admit dealing with null functions is a minor point of 
dilema with script writing, but I have gotten super intricate with the 
beautiful script design and features made available to me by ZSH, and I 
have found that the behavior suggested at "Should print" above is the 
only way that is consistent in a large script where an alias may use a 
null function for better handling of parameters without interfering with 
any currently same-name functions, or when a Heredoc is used and one 
wants to grab the last argument to use as the parameter of an 
immediately following null function.

-- 
Micah micah@askmicah.net <mailto:micah@askmicah.net>
AskMicah.Net <http://askmicah.net>, Problem Solving Agency

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