Evaluate media_queries for import statements

Fixes #1322

Author: mgreter

debugger.hpp

@@ -311,7 +311,7 @@ inline void debug_ast(AST_Node* node, string ind = "", Env* env = 0)
     cerr << ind << "Import " << block;
     cerr << " (" << pstate_source_position(node) << ")";
     cerr << " " << block->tabs() << endl;
-    // debug_ast(block->media_queries(), ind + " @ ");
+    debug_ast(block->media_queries(), ind + " @ ");
     // vector<string>         files_;
     for (auto imp : block->urls()) debug_ast(imp, "@ ", env);
   } else if (dynamic_cast<Assignment*>(node)) {

expand.cpp

@@ -279,7 +279,10 @@ namespace Sass {
   Statement* Expand::operator()(Import* imp)
   {
     Import* result = new (ctx.mem) Import(imp->pstate());
-    result->media_queries(imp->media_queries());
+    if (imp->media_queries()) {
+      Expression* ex = imp->media_queries()->perform(&eval);
+      result->media_queries(dynamic_cast<List*>(ex));
+    }
     for ( size_t i = 0, S = imp->urls().size(); i < S; ++i) {
       result->urls().push_back(imp->urls()[i]->perform(&eval));
     }