simonpj 2002/09/12 04:18:25 PDT
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Date: Thu, 12 Sep 2002 04:18:25 -0700
Modified files: (Branch: meta-haskell-branch)
ghc/compiler/basicTypes Module.lhs
ghc/compiler/hsSyn HsImpExp.lhs
ghc/compiler/parser Parser.y
ghc/compiler/rename RnEnv.lhs RnHiFiles.hi-boot-5
RnHiFiles.hi-boot-6 RnHiFiles.lhs
RnIfaces.lhs RnNames.lhs
ghc/compiler/typecheck TcRnDriver.lhs TcRnTypes.lhs
Log:
--------------------------------
Improve error recovery when an
interface file doesn't exist
--------------------------------
Up to now, when compiling M, GHC looks in M.hi to see if
its usages are up to date. But M.hi might mention Foo.hi, which
no longer exists; that is not an error, so no error is emitted.
The problem was that if M *did* still import Foo, the error-suppression
carried on, and we didn't get the error "no Foo.hi" instead we got
lots of "x is not in scope".
Solution is to make loadInterface a bit cleverer, including knowing
whether the reason for the load is for the purpose of usage tracking.
Actually that means that fewer functions are exported from RnHiFiles
which is good.
Also WhereFrom(..) moves from basicTypes/Module to typecheck/TcRnTypes,
which is satisfactory (less global).
Revision Changes Path
1.51.2.8 +0 -28 fptools/ghc/compiler/basicTypes/Module.lhs
1.19.14.5 +6 -3 fptools/ghc/compiler/hsSyn/HsImpExp.lhs
1.95.2.20 +5 -5 fptools/ghc/compiler/parser/Parser.y
1.147.2.22 +2 -2 fptools/ghc/compiler/rename/RnEnv.lhs
1.2.14.3 +1 -1 fptools/ghc/compiler/rename/RnHiFiles.hi-boot-5
1.2.2.2 +1 -1 fptools/ghc/compiler/rename/RnHiFiles.hi-boot-6
1.64.2.17 +47 -38 fptools/ghc/compiler/rename/RnHiFiles.lhs
1.152.2.15 +34 -29 fptools/ghc/compiler/rename/RnIfaces.lhs
1.131.2.12 +11 -12 fptools/ghc/compiler/rename/RnNames.lhs
1.1.2.5 +4 -4 fptools/ghc/compiler/typecheck/Attic/TcRnDriver.lhs
1.1.2.5 +31 -2 fptools/ghc/compiler/typecheck/Attic/TcRnTypes.lhs
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