Removed unused variables from scopes

src/build/core/Scope.go

@@ -27,11 +27,17 @@ func (s *state) pushScope(body ast.AST) {
 		scope.variables = make(map[string]*Variable, len(lastScope.variables))
 
 		for k, v := range lastScope.variables {
+			count := ast.Count(body, token.Identifier, v.Name)
+
+			if count == 0 {
+				continue
+			}
+
 			scope.variables[k] = &Variable{
 				Value:    v.Value,
 				Name:     v.Name,
 				Register: v.Register,
-				Alive:    ast.Count(body, token.Identifier, v.Name),
+				Alive:    count,
 			}
 		}
 	} else {