Major patch to fix reporting of unused imports

[ghc-hetmet.git] / compiler / main / HscMain.lhs

diff --git a/compiler/main/HscMain.lhs b/compiler/main/HscMain.lhs
index ba9e151..26247b1 100644 (file)
--- a/compiler/main/HscMain.lhs
+++ b/compiler/main/HscMain.lhs
@@ -229,12 +229,13 @@ hscTypecheckRename mod_summary rdr_module = do
           <- {-# SCC "Typecheck-Rename" #-}
              ioMsgMaybe $ tcRnModule hsc_env (ms_hsc_src mod_summary) True rdr_module
 
-    let rn_info = do decl <- tcg_rn_decls tc_result
-                     imports <- tcg_rn_imports tc_result
-                     let exports = tcg_rn_exports tc_result
-                     let doc = tcg_doc tc_result
-                    let hmi = tcg_hmi tc_result
-                     return (decl,imports,exports,doc,hmi)
+    let -- This 'do' is in the Maybe monad!
+        rn_info = do { decl <- tcg_rn_decls tc_result
+                     ; let imports = tcg_rn_imports tc_result
+                           exports = tcg_rn_exports tc_result
+                           doc            = tcg_doc tc_result
+                          hmi     = tcg_hmi tc_result
+                     ; return (decl,imports,exports,doc,hmi) }
 
     return (tc_result, rn_info)