Top-level type signatures in TcGblEnv?
Edsko de Vries
edskodevries at gmail.com
Mon Feb 18 15:02:55 CET 2013
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
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
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