FIX: nested block scopes.

examples/block.gri

@@ -1,2 +1,14 @@
 (assert-eq? 6 (: 2 4 6))
 (assert-eq? 9 (: 2 4 (: 3 0 9)))
+
+(:
+  ($ a 4)
+  (assert-eq? 4 a)
+
+  (:
+    ($ a 7)
+    (assert-eq? 7 a)
+  )
+
+  (assert-eq? 4 a)
+)

src/Compiler.cpp

@@ -54,8 +54,6 @@ namespace grino
                 program.push_instr(OPCODE_POP);
               }
           }
-                std::cout << "-------------------------" << std::endl;
-        std::cout << sym.string() << std::endl;
 
         leave_scope();
         sym.purge(m_scope.size());
@@ -86,7 +84,7 @@ namespace grino
       case NODE_LAMBDA: {
         auto params = node->child(0).lock();
 
-        enter_scope();
+        enter_scope(true);
 
         for (size_t i=0; i<params->size(); i++)
           {
@@ -177,10 +175,17 @@ namespace grino
     return m_scope.back() - 1;
   }
 
-  void Compiler::enter_scope()
+  void Compiler::enter_scope(bool reset)
+  {
+    if (m_scope.empty() || reset)
       {
         m_scope.push_back(0);
       }
+    else
+      {
+        m_scope.push_back(m_scope.back());
+      }
+  }
 
   void Compiler::leave_scope()
   {

src/Compiler.hpp

@@ -35,7 +35,7 @@ namespace grino
     std::vector<size_t> m_scope;
 
     size_t get_local_address();
-    void enter_scope();
+    void enter_scope(bool reset=false);
     void leave_scope();
   };
 }