Question

I know about perlop. What I am looking for is a quick lookup like the GHCi :info command:

ghci> :info (+)
class (Eq a, Show a) => Num a where
    (+) :: a -> a -> a
    ...
    -- Defined in GHC.Num
infixl 6 +

where I learn (+) is left-associative and has a precedence level of 6 from the infixl 6 + line.

Answer 1

I realize that it is not exactly what you ask for, but what about:

perl -MO=Deparse,-p -e "print $a+$b*$c**$d;"

it prints parentheses around the expressions according to precedence:

print(($a + ($b * ($c ** $d))));

And for things out of perl distibution, you can look on perlopquick – the pod arranged very similar manner as you specified in your question.