+ -- TRY FOR EARLY EXIT
+ -- We can't go for an early exit before this because we have to check
+ -- for name clashes. Consider:
+ --
+ -- module A where module B where
+ -- import B h = True
+ -- f = h
+ --
+ -- Suppose I've compiled everything up, and then I add a
+ -- new definition to module B, that defines "f".
+ --
+ -- Then I must detect the name clash in A before going for an early
+ -- exit. The early-exit code checks what's actually needed from B
+ -- to compile A, and of course that doesn't include B.f. That's
+ -- why we wait till after the plusEnv stuff to do the early-exit.
+
+ -- Check For eacly exit
+ checkErrsRn `thenRn` \ no_errs_so_far ->
+ if not no_errs_so_far then
+ -- Found errors already, so exit now
+ returnRn Nothing
+ else
+ checkEarlyExit this_mod `thenRn` \ (up_to_date, old_iface) ->
+ if up_to_date then
+ -- Interface files are sufficiently unchanged
+ putDocRn (text "Compilation IS NOT required") `thenRn_`
+ returnRn Nothing
+ else
+
+ -- RECORD BETTER PROVENANCES IN THE CACHE
+ -- The names in the envirnoment have better provenances (e.g. imported on line x)
+ -- than the names in the name cache. We update the latter now, so that we
+ -- we start renaming declarations we'll get the good names
+ -- The isQual is because the qualified name is always in scope
+ updateProvenances (concat [names | (rdr_name, names) <- rdrEnvToList gbl_env,
+ isQual rdr_name]) `thenRn_`
+
+ -- PROCESS EXPORT LISTS
+ exportsFromAvail this_mod exports all_avails gbl_env `thenRn` \ export_avails ->
+
+
+ -- ALL DONE
+ returnRn (Just (gbl_env, local_gbl_env, export_avails, global_avail_env, old_iface))
+ )
+ where