fiddle/import.rb: suppress warning

* ext/fiddle/lib/fiddle/import.rb: suppress exception report when
  $DEBUG is enabled.  [ruby-core:86536] [Bug #14686]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63205 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 6 insertions, 1 deletions

diff --git a/ext/fiddle/lib/fiddle/import.rb b/ext/fiddle/lib/fiddle/import.rb
index ae44914ec3..178ebb8c76 100644
--- a/ext/fiddle/lib/fiddle/import.rb
+++ b/ext/fiddle/lib/fiddle/import.rb
@@ -157,7 +157,8 @@ module Fiddle
     # :stopdoc:
     CALL_TYPE_TO_ABI = Hash.new { |h, k|
       raise RuntimeError, "unsupported call type: #{k}"
-    }.merge({ :stdcall => (Function::STDCALL rescue Function::DEFAULT),
+    }.merge({ :stdcall => Function.const_defined?(:STDCALL) ? Function::STDCALL :
+                          Function::DEFAULT,
               :cdecl   => Function::DEFAULT,
               nil      => Function::DEFAULT
             }).freeze
diff --git a/test/fiddle/test_import.rb b/test/fiddle/test_import.rb
index e08853da14..387f58295e 100644
--- a/test/fiddle/test_import.rb
+++ b/test/fiddle/test_import.rb
@@ -147,5 +147,9 @@ module Fiddle
       r = LIBC.atof("12.34")
       assert_includes(12.00..13.00, r)
     end
+
+    def test_no_message_with_debug
+      assert_in_out_err(%w[--debug -rfiddle/import], 'p Fiddle::Importer', ['Fiddle::Importer'])
+    end
   end
 end if defined?(Fiddle)