From d11287407832d91391387b341689400dcba7de67 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Sat, 9 Mar 2024 18:43:00 +0800
Subject: [PATCH] fixes #22166; adds sideeffects for `close` and `setFilePos`
 (#23380)

fixes #22166

(cherry picked from commit 1e20165a15cf8751f74751421a85075a81f799a6)
---
 lib/std/syncio.nim | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/std/syncio.nim b/lib/std/syncio.nim
index 53f604ad9f..9a000d6da3 100644
--- a/lib/std/syncio.nim
+++ b/lib/std/syncio.nim
@@ -320,7 +320,7 @@ elif defined(windows):
 const
   BufSize = 4000
 
-proc close*(f: File) {.tags: [], gcsafe.} =
+proc close*(f: File) {.tags: [], gcsafe, sideEffect.} =
   ## Closes the file.
   if not f.isNil:
     discard c_fclose(f)
@@ -763,7 +763,7 @@ proc open*(filename: string,
   if not open(result, filename, mode, bufSize):
     raise newException(IOError, "cannot open: " & filename)
 
-proc setFilePos*(f: File, pos: int64, relativeTo: FileSeekPos = fspSet) {.benign.} =
+proc setFilePos*(f: File, pos: int64, relativeTo: FileSeekPos = fspSet) {.benign, sideEffect.} =
   ## Sets the position of the file pointer that is used for read/write
   ## operations. The file's first byte has the index zero.
   if c_fseek(f, pos, cint(relativeTo)) != 0: