Michael Sperber writes:
The allocation may eventually lead to a GC happening. A superficial
look over concat indeed revealed no possibilities for QUIT or explicit
GC, but I'm assuming the author was trying to be safe rather than sorry.
No, there's an implicit call via wrong_type_argument to Fsignal, which
can GC.
I'm not sure why concat should call w_t_a, though. That would seem
safe only in the context of a user command.
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