[tlbuild] luaharfbuzz breaks tostring

[Simon Dales]

On Sun, 2020-03-08 at 06:30 +0900, Akira Kakuto wrote:
> > It also breaks in "luahbtex --luaonly".
> 
> I didn't say that "luahbtex --luaonly" did not break it.
> In the early pretest of TL2020, texlua was a symbolic link
> to luahbtex. So in the early pretest, "texlua" and "luahbtex --luaonly"
> were equivalent.
> However in the latest pretest, texlua becomes a
> symbolic link to luatex, which is not linked with luaharfbuzz.
> Thus your example itself does not work by "texlua ..." in the
> latest pretest. 

> You have to execute "luahbtex --luaonly ..." instead.

Done that: tostring() is still broken.

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Simon