Also allowing files to be imported without an extension. I.e., users can say…

Also allowing files to be imported without an extension. I.e., users can say "@import 'foo'" when the file is named "foo.scss".

document.cpp

@@ -32,12 +32,21 @@ namespace Sass {
     const char* path_str = path.c_str();
     f = std::fopen(path_str, "rb");
     if (!f) {
+      string path_with_extension(path + ".scss");
+      f = std::fopen(path_with_extension.c_str(), "rb");
+      if (!f) {
         const char* file_name_str = Prelexer::folders(path_str);
-      f = std::fopen((Token::make(path_str, file_name_str).to_string() +
+        string path_with_underscore(Token::make(path_str, file_name_str).to_string() +
                                     "_" +
-                      Token::make(file_name_str).to_string()).c_str(), "rb");
+                                    Token::make(file_name_str).to_string());
+        f = std::fopen(path_with_underscore.c_str(), "rb");
+        if (!f) {
+          string path_with_underscore_and_extension(path_with_underscore + ".scss");
+          f = std::fopen(path_with_underscore_and_extension.c_str(), "rb");
           if (!f) throw path;
         }
+      }
+    }
     if (std::fseek(f, 0, SEEK_END)) throw path;
     int status = std::ftell(f);
     if (status < 0) throw path;