[perl #123115] [BUG] ?? !! report LTA confusion when listop gobbles the !! in Rakudo

[Christian Bartolomaeus via RT]

This fails now with a typed exception and a fitting error message:

$ perl6 -e 'sub foo { 2 }; say 1 ?? foo !! 3'
===SORRY!=== Error while compiling -e
Your !! was gobbled by the expression in the middle; please parenthesize
at -e:1
------> sub foo { 2 }; say 1 ?? foo !!⏏ 3
    expecting any of:
        infix
        infix stopper
        postfix

I added a test for the typed exception to S03-operators/ternary.t. I'm closing 
this ticket as 'resolved'.