TTG hsSyn for Batch and Interactive Parsing

[Alan & Kim Zimmerman]

On 18 May 2018 at 16:13, Simon Peyton Jones <simonpj at microsoft.com> wrote:

>
>
> We can’t make the result type depend on DynFlags! (Yet)(
>
> *    parser :: DynFlags -> String *
>
> *  -> HsSyn (GhcPass (Parsed (if … *
>
> *                            then WithApiAnnotations*
>
> *                            else WihoutsApiAnnotations)*
>
>
We could conceptually have

  parser :: DynFlags -> String -> Either (HsSyn (Parsed
WithApiAnnotations)) (HsSyn (Parsed NoApiAnnotations))

The main point is that the next phase can make use of either of the
variants.

And it may be simplest to just always use the annotations, the ParsedSource
is normally discarded after renaming anyway.

Alan
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