> ```valgrind
> ==51885== Memcheck, a memory error detector
> ==51885== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
> ==51885== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
> ==51885== Command: ./vim
> ==51885==
> ==51885== Invalid read of size 4
> ==51885== at 0x2F64C1: copy_tv (typval.c:634)
> ==51885== by 0x19D5E5: eval_variable (evalvars.c:2583)
> ==51885== by 0x187FD3: eval7 (eval.c:3395)
> ==51885== by 0x188843: eval6 (eval.c:3013)
> ==51885== by 0x188843: eval5 (eval.c:2783)
> ==51885== by 0x188E4B: eval4 (eval.c:2639)
> ==51885== by 0x1894EC: eval3 (eval.c:2500)
> ==51885== by 0x1894EC: eval2 (eval.c:2374)
> ==51885== by 0x1894EC: eval1 (eval.c:2220)
> ==51885== by 0x3050F0: get_func_tv (userfunc.c:729)
> ==51885== by 0x1834A5: eval_func (eval.c:1979)
> ==51885== by 0x1882DC: eval7 (eval.c:3374)
> ==51885== by 0x188843: eval6 (eval.c:3013)
> ==51885== by 0x188843: eval5 (eval.c:2783)
> ==51885== by 0x188E4B: eval4 (eval.c:2639)
> ==51885== by 0x1894EC: eval3 (eval.c:2500)
> ==51885== by 0x1894EC: eval2 (eval.c:2374)
> ==51885== by 0x1894EC: eval1 (eval.c:2220)
> ==51885== Address 0x6ca55c4 is 4 bytes inside a block of size 344 free'd
> ==51885== at 0x483CA3F: free (in
> /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==51885== by 0x1477A3: free_buffer (buffer.c:903)
> ==51885== by 0x14E85B: set_curbuf (buffer.c:1744)
This suggests that a buffer variable was used after the buffer was
freed. Can't think how that can happen. Maybe the "b:" dict was copied
somewhere?
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