[Haskell-cafe] Adding type annotations to an AST?

oleg at okmij.org oleg at okmij.org
Tue Mar 6 08:15:12 CET 2012

> How do I add type annotations to interior locations in an abstract
> syntax tree?....
> i.e. the type it [algorithm] infers is the type of the whole
> program, I would also like  the types of any internal let-rec
> definitions so I can label my AST.

I had exactly the same problem: type reconstruction and the annotation
of all sub-terms with their inferred types. Even if the overall
type inference fails, the user can still see what the type checker was
able to infer before the error.

	Here is the solution

	There is a bit of the explanation here:

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