diff --git a/src/hb-ot-layout-gsubgpos.hh b/src/hb-ot-layout-gsubgpos.hh
index 41c624f78..0df6e545b 100644
--- a/src/hb-ot-layout-gsubgpos.hh
+++ b/src/hb-ot-layout-gsubgpos.hh
@@ -706,10 +706,11 @@ static inline bool intersects_array (const hb_set_t *glyphs,
 				     intersects_func_t intersects_func,
 				     const void *intersects_data)
 {
-  for (auto it = hb_iter (values, count); it; ++it)
-    if (likely (!intersects_func (glyphs, *it, intersects_data)))
-      return false;
-  return true;
+  return
+  + hb_iter (values, count)
+  | hb_map ([&] (const HBUINT16 &_) -> bool { return intersects_func (glyphs, _, intersects_data); })
+  | hb_any
+  ;
 }
 
 
@@ -734,8 +735,10 @@ static inline void collect_array (hb_collect_glyphs_context_t *c HB_UNUSED,
 				  collect_glyphs_func_t collect_func,
 				  const void *collect_data)
 {
-  for (auto it = hb_iter (values, count); it; ++it)
-    collect_func (glyphs, *it, collect_data);
+  return
+  + hb_iter (values, count)
+  | hb_apply ([&] (const HBUINT16 &_) { collect_func (glyphs, _, collect_data); })
+  ;
 }
 
 
@@ -1366,43 +1369,51 @@ struct RuleSet
   bool intersects (const hb_set_t *glyphs,
 		   ContextClosureLookupContext &lookup_context) const
   {
-    for (auto it = hb_iter (rule); it; ++it)
-      if ((this+*it).intersects (glyphs, lookup_context))
-	return true;
-    return false;
+    return
+    + hb_iter (rule)
+    | hb_map ([&] (const OffsetTo<Rule> &_) -> bool { return (this+_).intersects (glyphs, lookup_context); })
+    | hb_any
+    ;
   }
 
   void closure (hb_closure_context_t *c,
 		ContextClosureLookupContext &lookup_context) const
   {
-    for (auto it = hb_iter (rule); it; ++it)
-      (this+*it).closure (c, lookup_context);
+    return
+    + hb_iter (rule)
+    | hb_apply ([&] (const OffsetTo<Rule> &_) { (this+_).closure (c, lookup_context); })
+    ;
   }
 
   void collect_glyphs (hb_collect_glyphs_context_t *c,
 		       ContextCollectGlyphsLookupContext &lookup_context) const
   {
-    for (auto it = hb_iter (rule); it; ++it)
-      (this+*it).collect_glyphs (c, lookup_context);
+    return
+    + hb_iter (rule)
+    | hb_apply ([&] (const OffsetTo<Rule> &_) { (this+_).collect_glyphs (c, lookup_context); })
+    ;
   }
 
   bool would_apply (hb_would_apply_context_t *c,
 		    ContextApplyLookupContext &lookup_context) const
   {
-    for (auto it = hb_iter (rule); it; ++it)
-      if ((this+*it).would_apply (c, lookup_context))
-	return true;
-    return false;
+    return
+    + hb_iter (rule)
+    | hb_map ([&] (const OffsetTo<Rule> &_) -> bool { return (this+_).would_apply (c, lookup_context); })
+    | hb_any
+    ;
   }
 
   bool apply (hb_ot_apply_context_t *c,
 	      ContextApplyLookupContext &lookup_context) const
   {
     TRACE_APPLY (this);
-    for (auto it = hb_iter (rule); it; ++it)
-      if ((this+*it).apply (c, lookup_context))
-	return_trace (true);
-    return_trace (false);
+    return_trace (
+    + hb_iter (rule)
+    | hb_map ([&] (const OffsetTo<Rule> &_) -> bool { return (this+_).apply (c, lookup_context); })
+    | hb_any
+    )
+    ;
   }
 
   bool sanitize (hb_sanitize_context_t *c) const