Splitting a variable bound in a `NamedFieldPun` duplicates record match

[kcsongor]

Given the following code:

data Bar = Bar { ax :: Int, bax :: Bool }

bar :: Bar -> Int
bar Bar {ax, bax} = _

executing the case split on bax code action results in

data Bar = Bar { ax :: Int, bax :: Bool }

bar :: Bar -> Int
bar Bar {ax, bax} = _
bar Bar {ax, bax} = _

a workaround is turning the pattern in question into a normal record field binding first:

bar :: Bar -> Int
bar Bar {ax, bax = bax} = _

then executing the same code action results in the expected output:

bar :: Bar -> Int
bar Bar {ax, bax = False} = _
bar Bar {ax, bax = True} = _

I've tried this on both the latest master (9ae2092) and the latest release (1.1) and both exhibit this behaviour.

[isovector]

Nice catch. Easy thing to fix.