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.
I realize that it is not exactly what you ask for, but what about:
it prints parentheses around the expressions according to precedence:
And for things out of perl distibution, you can look on perlopquick - the pod arranged very similar manner as you specified in your question.