#5147: GHCi ignores missing instance
--------------------------------------+-------------------------------------
Reporter: boris | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 7.4.1
Component: GHCi | Version: 7.0.2
Keywords: linker, data families | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: GHC accepts invalid
program
--------------------------------------+-------------------------------------
Comment(by simonpj@…):
commit 35d213abfe27502fa34b60975c4b18ed51bfeb05
{{{
Author: Simon Peyton Jones <[email protected]>
Date: Tue Aug 2 08:18:03 2011 +0100
Refactor the imports of InteractiveContext
Instead of two fields
ic_toplev_scope :: [Module]
ic_imports :: [ImportDecl RdrName]
we now just have one
ic_imports :: [InteractiveImport]
with the auxiliary data type
data InteractiveImport
= IIDecl (ImportDecl RdrName) -- Bring the exports of a
particular module
-- (filtered by an import decl)
into scope
| IIModule Module -- Bring into scope the entire top-level
envt of
-- of this module, including the things
imported
-- into it.
This makes lots of code less confusing. No change in behaviour.
It's preparatory to fixing Trac #5147.
While I was at I also
* Cleaned up the handling of the "implicit" Prelude import
by adding a ideclImplicit field to ImportDecl. This
significantly reduces plumbing in the handling of
the implicit Prelude import
* Used record notation consistently for ImportDecl
compiler/basicTypes/RdrName.lhs | 5 +-
compiler/hsSyn/HsImpExp.lhs | 12 ++-
compiler/iface/MkIface.lhs | 2 +-
compiler/main/GHC.hs | 2 +-
compiler/main/HeaderInfo.hs | 22 ++--
compiler/main/HscMain.lhs | 4 +-
compiler/main/HscStats.lhs | 3 +-
compiler/main/HscTypes.lhs | 29 ++++--
compiler/main/InteractiveEval.hs | 53 +++++-----
compiler/parser/Parser.y.pp | 6 +-
compiler/rename/RnNames.lhs | 60 ++++-------
compiler/typecheck/TcRnDriver.lhs | 22 +++-
ghc/InteractiveUI.hs | 202
++++++++++++++++++++-----------------
13 files changed, 231 insertions(+), 191 deletions(-)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5147#comment:2>
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