Minor

src/hb-ot-shape.cc

@@ -581,6 +581,7 @@ hb_ot_shape (hb_font_t    *font,
   hb_form_clusters (buffer);
 
   /* SUBSTITUTE */
+  {
 
     buffer->clear_masks ();
 
@@ -596,8 +597,10 @@ hb_ot_shape (hb_font_t    *font,
     if (substitute_fallback)
       hb_substitute_complex_fallback (font, face, buffer, features, num_features);
 
+  }
 
   /* POSITION */
+  {
 
     buffer->clear_masks ();
 
@@ -613,6 +616,7 @@ hb_ot_shape (hb_font_t    *font,
 
     if (position_fallback)
       hb_position_complex_fallback_visual (font, face, buffer, features, num_features);
+  }
 
   buffer->direction = original_direction;
 }