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Exact lookup

1. data LookupGRE info

   ghc	GHC.Types.Name.Reader

   What should we look up in a GlobalRdrEnv? Should we only look up names with the exact same OccName, or do we allow different NameSpaces? Depending on the answer, we might need more or less information from the GlobalRdrEnv, e.g. if we want to include matching record fields we need to know if the corresponding record fields define field selectors, for which we need to consult the GREInfo. This is why this datatype is a GADT. See Note [IfGlobalRdrEnv].

2. LookupOccName :: forall info . OccName -> WhichGREs info -> LookupGRE info

   ghc	GHC.Types.Name.Reader

   Look for this specific OccName, with the exact same NameSpace, in the GlobalRdrEnv.

3. LookupRdrName :: forall info . RdrName -> WhichGREs info -> LookupGRE info

   ghc	GHC.Types.Name.Reader

   Look up the OccName of this RdrName in the GlobalRdrEnv, filtering out those whose qualification matches that of the RdrName. Lookup returns an empty result for Exact or Orig RdrNames.

4. LookupFound :: Module -> (UnitInfo, ModuleOrigin) -> LookupResult

   ghc	GHC.Unit.State

   Found the module uniquely, nothing else to do

5. LookupHidden :: [(Module, ModuleOrigin)] -> [(Module, ModuleOrigin)] -> LookupResult

   ghc	GHC.Unit.State

   No modules found, but there were some hidden ones with an exact name match. First is due to package hidden, second is due to module being hidden

6. LookupMultiple :: [(Module, ModuleOrigin)] -> LookupResult

   ghc	GHC.Unit.State

   Multiple modules with the same name in scope

7. LookupNotFound :: [ModuleSuggestion] -> LookupResult

   ghc	GHC.Unit.State

   Nothing found, here are some suggested different names

8. data LookupResult

   ghc	GHC.Unit.State

   The result of performing a lookup

9. LookupUnusable :: [(Module, ModuleOrigin)] -> LookupResult

   ghc	GHC.Unit.State

   No modules found, but there were some unusable ones with an exact name match

10. data LookupResult

    wai-app-static	WaiAppStatic.Types

    Result of looking up a file in some storage backend. The lookup is either a file or folder, or does not exist.

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