= A monomorphic binding syntax =

behave just like the monomorhpic binding operator, but instead of having a new
operator, use parens as in:

{{{
(shared) = 3 + 4    -- monomorphic binding
}}}

see http://www.haskell.org//pipermail/haskell-prime/2006-January/000117.html

'''For:'''
 * Simpler and more consistent than the M-R
 * doesn't eat up a new operator
 * can be seen as a degenerate case of the standard 'pattern matching is monomorphic' rule
 * syntax makes it clear this is something that can happen to values and not functions
 * we are already used to (=) being overloaded in this way

'''Against:'''
 * would make parentheses matter in a certain situation (n+k patterns and negative literals already do this)