Trees that Grow in the hsSyn AST

[Alan & Kim Zimmerman]

Hi all

You may be aware that Shayan Najd presented the paper  "Trees that Grow"[1]
at HIW last year.

Based on the following mandate

> As in my previous email to Shayan (attached).  Wiki page, describe goals,
design,

> approach.  Point to prototype implementation.  Seek comments.   You can
say that

>I am supportive!

>
> Simon

We have set up a Wiki page at [2] describing a prototype implementation of
the first stage of this for the hsSyn AST, which is to change the
polymorphic variable from one of RdrName / Name / Id to an index type. This
is presented as a fabricator diff at [3].

Please take a look and provide feedback.

Regards
  Alan


[1]
http://www.jucs.org/jucs_23_1/trees_that_grow/jucs_23_01_0042_0062_najd.pdf
[2] https://ghc.haskell.org/trac/ghc/wiki/ImplementingTreesThatGrow
[3] https://phabricator.haskell.org/D3609
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