From df9452ea9e646e300c3e1ed14408a00e1cb48dda Mon Sep 17 00:00:00 2001
From: Alejandro Exojo <suy@badopi.org>
Date: Mon, 15 Dec 2025 17:02:10 +0100
Subject: [PATCH] fix(man.lua): show_toc condition may cause infinite loop
 #36979

`lnum` gets set with `vim.fn.nextnonblank`, which returns 0 on failure,
and which is truthy on Lua.

(cherry picked from commit 46220afef806e571b408973c51ba72acf009e078)
---
 runtime/lua/man.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/runtime/lua/man.lua b/runtime/lua/man.lua
index f0478dc113..3cbd1e9404 100644
--- a/runtime/lua/man.lua
+++ b/runtime/lua/man.lua
@@ -795,7 +795,7 @@ function M.show_toc()
 
   local lnum = 2
   local last_line = fn.line('$') - 1
-  while lnum and lnum < last_line do
+  while lnum > 0 and lnum < last_line do
     local text = fn.getline(lnum)
     if text:match('^%s+[-+]%S') or text:match('^   %S') or text:match('^%S') then
       toc[#toc + 1] = {