From ceac82f78be8baeddfa8536472d8b08df2eb7d49 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 26 Feb 2025 11:29:54 -0300
Subject: Details

Comments, small changes in the manual, an extra test for errors in
error handling, small changes in tests.
---
 testes/errors.lua | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

(limited to 'testes/errors.lua')

diff --git a/testes/errors.lua b/testes/errors.lua
index 027e1b03..adc111fd 100644
--- a/testes/errors.lua
+++ b/testes/errors.lua
@@ -45,7 +45,7 @@ end
 -- test error message with no extra info
 assert(doit("error('hi', 0)") == 'hi')
 
--- test error message with no info
+-- test nil error message
 assert(doit("error()") == nil)
 
 
@@ -555,7 +555,7 @@ if not _soft then
 
   -- error in error handling
   local res, msg = xpcall(error, error)
-  assert(not res and type(msg) == 'string')
+  assert(not res and msg == 'error in error handling')
   print('+')
 
   local function f (x)
@@ -586,6 +586,27 @@ if not _soft then
 end
 
 
+do  -- errors in error handle that not necessarily go forever
+  local function err (n)   -- function to be used as message handler
+    -- generate an error unless n is zero, so that there is a limited
+    -- loop of errors
+    if type(n) ~= "number" then   -- some other error?
+      return n   -- report it
+    elseif n == 0 then
+      return "END"   -- that will be the final message
+    else error(n - 1)   -- does the loop
+    end
+  end
+
+  local res, msg = xpcall(error, err, 170)
+  assert(not res and msg == "END")
+
+  -- too many levels
+  local res, msg = xpcall(error, err, 300)
+  assert(not res and msg == "C stack overflow")
+end
+
+
 do
   -- non string messages
   local t = {}
-- 
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