Top-level type signatures in TcGblEnv?
simonpj at microsoft.com
Mon Feb 25 16:22:02 CET 2013
Can't you just use the range of the tcg_type_env?
From: Edsko de Vries [mailto:edskodevries at gmail.com]
Sent: 18 February 2013 14:03
To: Simon Peyton-Jones
Cc: ghc-devs at haskell.org
Subject: Top-level type signatures in TcGblEnv?
Dear Simon, other ghc devs,
I hooked into genericHscRecompile to traverse the typechecked source and construct an environment of type
recording all identifiers in the source with their type, definition site, etc. To be precise, I am traversing the
tcg_binds :: LHsBinds Id, -- Value bindings in this module
field of the TcGblEnv structure returned by the type checker. The problem is that I have so far been unable to find top-level user-supplied type annotations inside LHsBinds. The closest thing I've found is the PostTcType of a MatchGroup, but that is not Located; what I'm really looking for is an LSig.
Now, let-bindings get a HsValBindsLR instead of an LHsBinds, and that *does* contain signatures. My question is two-fold:
1. First, am I missing something? Are there LSigs somewhere inside the TcGblEnv where I simply haven't seen them?
2. If not, is there a good reason why tcg_binds is an LHsBinds rather than an HsValBindsLR? And if there isn't, would you accept a patch making the change?
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