[commit: ghc] ghc-8.2: testsuite: Add regression test for #13474 (f7b19a6)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : ghc-8.2
Link       : http://ghc.haskell.org/trac/ghc/changeset/f7b19a66e64df5b89c65ccda8d6bc22f6b9a7b4d/ghc

>---------------------------------------------------------------

commit f7b19a66e64df5b89c65ccda8d6bc22f6b9a7b4d
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Sat Apr 1 10:59:53 2017 -0400

    testsuite: Add regression test for #13474
    
    (cherry picked from commit 6928d8019cd2cdd1c0b9d6e1fe1a0c8c07e57595)


>---------------------------------------------------------------

f7b19a66e64df5b89c65ccda8d6bc22f6b9a7b4d
 testsuite/tests/typecheck/should_compile/T13474.hs | 13 +++++++++++++
 testsuite/tests/typecheck/should_compile/all.T     |  1 +
 2 files changed, 14 insertions(+)

diff --git a/testsuite/tests/typecheck/should_compile/T13474.hs b/testsuite/tests/typecheck/should_compile/T13474.hs
new file mode 100644
index 0000000..9775832
--- /dev/null
+++ b/testsuite/tests/typecheck/should_compile/T13474.hs
@@ -0,0 +1,13 @@
+module T13474 where
+
+import qualified Data.Map as M
+
+class Default a where
+  def :: a
+
+foo :: Default a => b -> a
+foo x = def
+
+mapdef :: Default v => M.Map k v -> M.Map k v
+mapdef = M.map foo
+
diff --git a/testsuite/tests/typecheck/should_compile/all.T b/testsuite/tests/typecheck/should_compile/all.T
index 97a5350..33ffc4f 100644
--- a/testsuite/tests/typecheck/should_compile/all.T
+++ b/testsuite/tests/typecheck/should_compile/all.T
@@ -547,3 +547,4 @@ test('T13381', normal, compile_fail, [''])
 test('T13337', normal, compile, [''])
 test('T13343', normal, compile, [''])
 test('T13458', normal, compile, [''])
+test('T13474', normal, compile, [''])