CoCoA » CoCoA-5

Currently CoCoA-5 accepts syntactically the following input

A:-B;

which is interpreted as A:(-B); which is not what I wanted
Of course, I had meant to type A:=B; but erred.

I suggest that the only valid 2nd args for the colon operator be

• a variable (possibly indexed) e.g. I:J or I:J[2]
• a bracketed expression e.g. I:(J1+J2)
• a function call e.g. I:ideal(x,y)

Comments? Ideas?