From c52e44d8459c04387940bc95e90ed36877466fac Mon Sep 17 00:00:00 2001
From: Amjad Ben Hedhili <amjadhedhili@outlook.com>
Date: Mon, 13 Mar 2023 08:43:45 +0100
Subject: [PATCH 1/2] Add `cursor` annotations to lists iterator variables
 (#21507)

Add `cursor` annotations to iterator variables

* See https://nim-lang.github.io/Nim/destructors.html#the-cursor-pragma
---
 lib/pure/collections/lists.nim | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/pure/collections/lists.nim b/lib/pure/collections/lists.nim
index a08c62964..6e3ddf397 100644
--- a/lib/pure/collections/lists.nim
+++ b/lib/pure/collections/lists.nim
@@ -188,13 +188,13 @@ func toDoublyLinkedList*[T](elems: openArray[T]): DoublyLinkedList[T] {.since: (
     result.add(elem)
 
 template itemsListImpl() {.dirty.} =
-  var it = L.head
+  var it {.cursor.} = L.head
   while it != nil:
     yield it.value
     it = it.next
 
 template itemsRingImpl() {.dirty.} =
-  var it = L.head
+  var it {.cursor.} = L.head
   if it != nil:
     while true:
       yield it.value

From 26b7a74a45059453b42f8eee4ccf0586b9003087 Mon Sep 17 00:00:00 2001
From: Amjad Ben Hedhili <amjadhedhili@outlook.com>
Date: Mon, 13 Mar 2023 17:32:20 +0100
Subject: [PATCH 2/2] Optimize `cgen.addIndent` (#21508)

* Optimize `cgen.addIndent`

* Avoid temporaries
---
 compiler/cgen.nim | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/compiler/cgen.nim b/compiler/cgen.nim
index d2095016c..5ba68580d 100644
--- a/compiler/cgen.nim
+++ b/compiler/cgen.nim
@@ -228,8 +228,12 @@ macro ropecg(m: BModule, frmt: static[FormatStr], args: untyped): Rope =
   result.add newCall(ident"rope", resVar)
 
 proc addIndent(p: BProc; result: var Rope) =
-  for i in 0..<p.blocks.len:
-    result.add "\t".rope
+  var i = result.len
+  let newLen = i + p.blocks.len
+  result.setLen newLen
+  while i < newLen:
+    result[i] = '\t'
+    inc i
 
 template appcg(m: BModule, c: var Rope, frmt: FormatStr,
            args: untyped) =