Re: grammar question ?

[Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>]

I have a partial reponse

the prototype of 'for' is 

 "vV=GGI"

This mean that the first argument of for must be a variable name followed by a equal signe followed by a GEN.

GP could accept

for( x=seq1, seq2, seq3)

but 
for( v=[];j=0, 10, v=concat(v,j^2))

would be understand as
j=0;for(v=0, 10, v=concat(v,j^2))

because the value of the seq [];j=0 is 0.

I have discussed with Karim the point of allowing seq everywhere, but
it seems the current behavior come from historical reason, when seq
parsing was mush lower than expr parsing.

Bill