Fail to reject an invalid escape sequence #30
Description
The parser fails to reject the following invalid input:
return "\u{XYZ}"
Only hexadecimal digits should be allowed in the escape sequence, which is not the case in the example above.
From the Lua specification, we have:
The UTF-8 encoding of a Unicode character can be inserted in a literal string with the escape sequence \u{XXX} (note the mandatory enclosing brackets), where XXX is a sequence of one or more hexadecimal digits representing the character code point.
Can you provide feedback on this issue please.