Top level pattern matching

[paf31]

E.g.

test pattern1 = y
test pattern2 = z
...

would be desugared to

test = \x -> case x of { pattern1 -> y, pattern2 -> z ... }

[paf31]

See toplevelcase branch.

The current desugaring is

test pattern1 pattern2 = y
test pattern3 pattern4 = z
...

to

test = \_0 -> \_1 -> case { _0: _0, _1: _1 } of
   { _0 = pattern1, _1 = pattern2 } -> y
   { _0 = pattern3, _1 = pattern4 } -> z

[paf31]

Added multiple argument case statements to reduce the noise in the generated JS introduced by the desugaring described above.

Available in 0.2.1.1.