[Maxima-bugs] [ maxima-Bugs-733030 ] Weird trigexpand interaction /FIX?

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Bugs item #733030, was opened at 2003-05-05 21:48
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
Summary: Weird trigexpand interaction /FIX?

Initial Comment:
 makelist(f(sin(x)^2-cos(x)^2),f,['trigreduce,'trigexpand]);

gives the error "Improper name or value in functional 
position: 2".

The problem is that the internal function sp1add is 
somehow modifying the fluid variable "arg", which is also 
used by makelist.  I found this using:

(trace (sp1add :entry (if (boundp 'arg) (list 'sp1add 
arg)) :exit (if (boundp 'arg) (list 'sp1add arg))))

I do not understand how arg is being modified.  The code 
clearly *binds* arg in the let*.  The subfunctions are not 
modifying arg.  I have been unable to reproduce this 
problem using source.  When I load sp1add from 
source, it works fine; also if I compile sp1add.

Perhaps there is some problem with the non-standard 
let* function? or with the compiler it was built on?  I am 
grasping at straws.

Maxima 5.9.0 mingw Windows 2000 Athlon


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