fix parsing bug related to feeds

Reported by (Kevin Colyer)++.

Feed operators can not go on the next line if the line they follow end
in a closing curly brace. This is explained in S04's section
"Statement-ending blocks" -- basically, if a closing curly at the end
of a line *can* end a statement, it does.
replace three 'ucfirst' by 'tc'

The former has been deprecated, according to the recent Rakudo
that I ran on the game.