diff --git a/parser/parser.yy b/parser/parser.yy
index 3994319..0f3a794 100644
--- a/parser/parser.yy
+++ b/parser/parser.yy
@@ -245,6 +245,7 @@ general_item: transform_block { $$ = $1; }
             | shape_definition { $$ = $1; }
             | shape { $$ = $1; }
             | for { $$ = $1; }
+            | stmt_expression { $$ = $1; }
             ;
 
 intersect: INTERSECT LCURLY bool_items RCURLY {
@@ -589,11 +590,14 @@ expression: term                    { $$ = $1; }
           | MINUS expression %prec UMINUS {
               $$ = new BinOpNode('-', new NumberNode(0.0), $2);
           }
-          | assignment              { $$ = $1; }
-          | local_assignment        { $$ = $1; }
-          | local_decl              { $$ = $1; }
+          | stmt_expression         { $$ = $1; }
           ;
 
+stmt_expression: assignment              { $$ = $1; }
+               | local_assignment        { $$ = $1; }
+               | local_decl              { $$ = $1; }
+               ;
+
 bool_expression: expression LESS expression {
                     $$ = new BoolExpressionNode('<', $1, $3);
                }