literal strings 'async' is mis-parsed

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Linux

What is the issue affecting?

Annotations

Expected Behaviour

The following should work without errors:

---@class Unit
---@field mode "async" | "sync"

and:

---@type Unit
local test = {}

test.mode = (hint) --> "async" or "sync"

Actual Behaviour

The follow shows an error

---@class Unit
---@field mode "async" (error here: <type name> expected.) | "sync"

and:

---@type Unit
local test = {}

test.mode = (hint) --> "sync"

Reproduction steps

1. Copy and paste the expected behavior codeblock.

Additional Notes

Only happens with async as far as I can see.

Log File

No response

Comienza reproduciendo los ejemplos de anotaciones en la extensión de Visual Studio Code y compara cómo el parser gestiona la cadena literal "async" frente a "sync". Sigue el procesamiento de anotaciones y nombres de tipo que produce el error esperado y añade cobertura que demuestre que ambos valores literales se aceptan sin cambiar la indicación de tipo informada.