Don't swallow LoadErrors when requiring a dashed gem

This looks like #1807

when raising a LoadError in a required gem, bundler will rescue it to try and see if it came from his own namespaced require or from the required file.

If it comes from the dashed require it will re-raise the original exception in case the gem was dashed but the first require was ok but raised a LoadError after.

However, the exception is swallowed if we require a dashed gem without the proper file name, for example gem name : 'foo-bar' and file architecture : 'foo/bar.rb'

This PR raise the exception back in case it really comes from inside the namespaced file.

lib/bundler/runtime.rb

@@ -83,11 +83,10 @@ def require(*groups)
             begin
               namespaced_file = dep.name.gsub('-', '/')
               Kernel.require namespaced_file
-            rescue LoadError
+            rescue LoadError => e
               REGEXPS.find { |r| r =~ e.message }
               regex_name = $1
-              raise e if dep.autorequire || (regex_name && regex_name.gsub('-', '/') != namespaced_file)
-              raise e if regex_name.nil?
+              raise if regex_name != namespaced_file
             end
           end
         end

spec/runtime/require_spec.rb

@@ -98,6 +98,28 @@
     expect(err).to eq("ZOMG LOAD ERROR")
   end
 
+  it "doesn't swallow the error when the library has an unrelated error" do
+    build_lib "loadfuuu", "1.0.0" do |s|
+      s.write "lib/loadfuuu.rb", "raise LoadError.new(\"cannot load such file -- load-bar\")"
+    end
+
+    gemfile <<-G
+      path "#{lib_path}"
+      gem "loadfuuu"
+    G
+
+    cmd = <<-RUBY
+      begin
+        Bundler.require
+      rescue LoadError => e
+        $stderr.puts "ZOMG LOAD ERROR: \#{e.message}"
+      end
+    RUBY
+    run(cmd, :expect_err => true)
+
+    expect(err).to eq("ZOMG LOAD ERROR: cannot load such file -- load-bar")
+  end
+
   describe "with namespaced gems" do
     before :each do
       build_lib "jquery-rails", "1.0.0" do |s|
@@ -170,8 +192,9 @@
 
     it "doesn't swallow the error when the library has an unrelated error" do
       build_lib "load-fuuu", "1.0.0" do |s|
-        s.write "lib/load-fuuu.rb", "raise LoadError.new(\"cannot load such file -- load-bar\")"
+        s.write "lib/load/fuuu.rb", "raise LoadError.new(\"cannot load such file -- load-bar\")"
       end
+      lib_path('load-fuuu-1.0.0/lib/load-fuuu.rb').rmtree
 
       gemfile <<-G
         path "#{lib_path}"