Bug report: string escapes can mess up terminal

["Soni L." <fakedme@...>]

$ lua
Lua 5.3.4  Copyright (C) 1994-2017 Lua.org, PUC-Rio
> "\u"
stdin:1: missing '{' near '"\u"'
> "\u{"
stdin:1: hexadecimal digit expected near '"\u{"'
> "hello \u{"
stdin:1: hexadecimal digit expected near '"hello \u{"'
> "hello \x20 \u{"
stdin:1: hexadecimal digit expected near '"hello   \u{"'
> "hello \x00 \u{"
stdin:1: hexadecimal digit expected near '"hello '
> "hello \x1b[33m \u{" -- everything beyond this point shall look GOLD
stdin:1: hexadecimal digit expected near '"hello  \u{"'
> -- GOLD TEXT HERE

This doesn't look good... (try it on a color terminal. sadly email 
doesn't do well with colors...)

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