More import related hints

Now for unqualified imports. Improves upon #11071.

Unfortunately, it seems that since 7.10, ghc will not print all
out-of-scope errors.

Test Plan: test suite updated

Reviewers: austin, thomie, bgamari

Reviewed By: bgamari

Differential Revision: https://phabricator.haskell.org/D1478

GHC Trac Issues: #11071

1 files changed, 6 insertions, 2 deletions

diff --git a/testsuite/tests/annotations/should_fail/annfail11.stderr b/testsuite/tests/annotations/should_fail/annfail11.stderr
index 384f6179aa..40bcebb904 100644
--- a/testsuite/tests/annotations/should_fail/annfail11.stderr
+++ b/testsuite/tests/annotations/should_fail/annfail11.stderr
@@ -1,10 +1,14 @@
 
-annfail11.hs:3:1:
+annfail11.hs:3:1: error:
     Not in scope: ‘length’
+    Perhaps you want to add ‘length’ to the import list
+    in the import of ‘Prelude’ (annfail11.hs:1:8-16).
     In the annotation:
       {-# ANN length "Cannot annotate other modules yet" #-}
 
-annfail11.hs:4:1:
+annfail11.hs:4:1: error:
     Not in scope: type constructor or class ‘Integer’
+    Perhaps you want to add ‘Integer’ to the import list
+    in the import of ‘Prelude’ (annfail11.hs:1:8-16).
     In the annotation:
       {-# ANN type Integer "Cannot annotate other modules yet" #-}