This is because perl doesn't know where your variablename ends and guesses the :: are part of it.
Change your print "$typ::$dat>>\n"; to print "${typ}::${dat}>>\n"; and it should work.
The {}'s are to explicitly tell perl which bit of the characters following $ are part of the variablename.

Edit:
Perls package system allows you to access, from your main program, global variables defined in such a package using $package::variablename.
This is why perl tries to interpret the :: and then complains :)

In reply to Re: variables with colons by Neighbour
in thread variables with colons by SavannahLion

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