bug#70059: 30.0.50; c-ts-mode crashes emacs

[Eli Zaretskii]

> From: Yuan Fu <casouri@gmail.com>
> Date: Sat, 30 Mar 2024 22:52:55 -0700
> Cc: Felix <felix.dick@web.de>,
>  70059@debbugs.gnu.org
> 
> It’s a bit strange since Ftreesit_pattern_expand doesn’t call tree-sitter 
> function. This function just expands a sexp query like '(function_definition 
> @capture) to a string “(function_definition @capture)”. 

I'm not sure I follow: the backtrace shows that
Ftreesit_pattern_expand called Fmapconcat, and I do see a call to
Fmapconcat in Ftreesit_pattern_expand.  So what did you mean by
"Ftreesit_pattern_expand doesn't call tree-sitter function"?

> Perhaps something it does triggers GC and GC tries to collect some 
> tree-sitter node or parser, and there’s some problem when freeing the node or 
> parser with that version of tree-sitter library.

Again, not sure I follow: according to the backtrace, Fmapconcat
called mapconcat1, which called Ffuncall.  And Ffuncall is known to
trigger GC if needed.