Parse error when using (~)

[yairchu]

This line:

https://github.com/lamdu/syntax-tree/blob/master/src/AST.hs#L31

Causes this error:

src/AST.hs:31:49: Error: Parse error
Found:
    monoChildren ::
        forall expr child n m.
  >     ( Children expr, ChildrenConstraint expr ((~) child)
        , Functor n, Functor m
        ) =>

When playing around with things looks like the trigger to the error is using (~). It might be a haskell-src-exts issue, but I don't know so asking here first..

[ndmitchell]

Almost certainly an upstream haskell-src-exts error. Would you like to raise a ticket for them?

[yairchu]

Opened ticket there - haskell-suite/haskell-src-exts#421

[ndmitchell]

Confirmed works with HEAD that doesn't use HSE for parsing, so fixed in the next release.

[yairchu]

Fantastic, thanks!