Add a FIXME re: the orphan instances.

Author: robrix

semantic-python/src/Language/Python/Core.hs

@@ -77,6 +77,7 @@ instance Compile t => GCompileSum (M1 C c (M1 S s (K1 R t))) where
   gcompileSum (M1 (M1 (K1 t))) = compile t
 
 
+-- FIXME: depend on https://github.com/tree-sitter/haskell-tree-sitter/pull/90 so we can get rid of these orphan instances
 deriving instance Generic Py.CompoundStatement
 deriving instance Generic Py.SimpleStatement