Roblox doesn't call __tostring on error objects about roblox-lua-promise

[evaera]

This appears to be fixed now.

local Promise = require(script.Parent.Lib)

local p = Promise.new(function(_, rej)
	error("lol")
end)

p:expect()

  05:39:34.234  -- Promise.Error(ExecutionError) --
ServerScriptService.Script:10: lol
ServerScriptService.Script:10
ServerScriptService.Lib:172 function runExecutor
ServerScriptService.Lib:299

Promise created at:

ServerScriptService.Script:9
  -  Server - Lib:1664
  05:39:34.234  Stack Begin  -  Studio
  05:39:34.234  Script 'ServerScriptService.Lib', Line 1664 - function expectHelper  -  Studio - Lib:1664
  05:39:34.234  Script 'ServerScriptService.Lib', Line 1696 - function expect  -  Studio - Lib:1696
  05:39:34.234  Script 'ServerScriptService.Script', Line 13  -  Studio - Script:13
  05:39:34.234  Stack End  -  Studio

[evaera]

This is ostensibly a Roblox bug.

I can't fix this, because I have no way to know if the error is going to be displayed to a console for humans or caught by a program and inspected. It would be undesirable for the Promise library to implicitly convert rejection value types.

Going to contact Roblox about this issue and hopefully they can address it on their end.

[evaera]

Hey @jhampton - since you're here... This is still an outstanding issue which makes using the Promise library a little more inconvenient. Do you think you could take a look? There's an open feature request, but it didn't get any response. Thanks!

[jhampton]

Sure thing @evaera, I'll take a look!