PRINT argument highlighting bug

[ojwb]

In P.X. owlet colours X. red thinking it's an invalid token, but this is actually valid BBC BASIC - e.g. this program prints 10:

@%=0:X=1:P.X.

The X. parses as a variable name (X) followed by . as a degenerate floating point literal (with value 0).

[ojwb]

A related case - this outputs * (followed by a zero byte which isn't visible):

X=42:V.X.

VDU doesn't actually require commas or semicolons between arguments, so this is effectively the same as V.X,. i.e. VDU X, 0.0. This quirk of VDU doesn't appear to be a documented feature however so handling this case correctly seems less important, but it can probably be fixed along with PRINT.