newtypes are formatted on two lines with break_single_constructors: false

[imuli]

As newtypes always have a single constructor, you would think that they
would obey break_single_constructors. However, with that set to false,

newtype Foo = Foo Int

becomes

newtype Foo
   = Foo Int

while data with a single constructor stay on one line.

data Foo = Foo Int

[imuli]

Okay, having now found the place in the source that explicitly checks this and the test case that claims the current behavior is correct, it seems like @jaspervdj wants this behavior. I still find it unintuitive - if it's not too much configuration bloat could we add a break_newtypes flag?

[EncodePanda]

I think this accident @imuli . newtype and data have to be consistent. let's fix that.

[stevladimir]

Hello, any progress on that? Maybe I can help somehow?

[jaspervdj]

Yeah this is accidental. I would welcome a PR that fixes this :-)

[stevladimir]

IMO this should be the default behavior, but it is somewhat breaking change (people might get big diffs) if we just directly alter the current behavior. If this is acceptable I would go this way as I see no strong reasons to distinguish newtype and data in this respect.

Otherwise, @imuli has a fix which should be backwards compatible in cost of introducing a new option.

Which one would you prefer?

[imuli]

I think the primary issue with my fix as it stands is that it doesn't provide any tests?

I also would have no complaints about somone removing the option in favor of break_single_constructors.