http://code.google.com/p/vim/source/browse/src/ex_docmd.c?r=79c59b4c9d20e5d7de9b5018062289d9a21887e4#2487:
> #ifdef FEAT_USR_CMDS
> valid_yank_reg(*ea.arg, (ea.cmdidx != CMD_put
> && USER_CMDIDX(ea.cmdidx)))
> #else
Here expression `(ea.cmdidx != CMD_put && USER_CMDIDX(ea.cmdidx))` is
effectively the same thing as `USER_CMDIDX(ea.cmdidx)`. I am not sure what
exactly was meant, but based on the fact that
yank /
and
delete /
do nothing without any errors and register `/` is excluded from match when
second argument to valid_yank_reg is true I assume this should’ve been
`(ea.cmdidx != CMD_put && !USER_CMDIDX(ea.cmdidx))`: for :put command and user
commands all registers will be valid, for others registers like `/` will throw
an error.
Patch without a test (I failed to find any tests for :yank or :delete):
*** /tmp/extdiff.y9BxRE/vim-upstream.79c59b4c9d20/src/ex_docmd.c
2014-10-12 23:30:54.924767233 +0400
--- /home/zyx/a.a/Proj/c/vim-upstream/src/ex_docmd.c 2014-10-12
23:30:01.284767830 +0400
***************
*** 2485,2491 ****
if (
#ifdef FEAT_USR_CMDS
valid_yank_reg(*ea.arg, (ea.cmdidx != CMD_put
! && USER_CMDIDX(ea.cmdidx)))
#else
valid_yank_reg(*ea.arg, ea.cmdidx != CMD_put)
#endif
--- 2485,2491 ----
if (
#ifdef FEAT_USR_CMDS
valid_yank_reg(*ea.arg, (ea.cmdidx != CMD_put
! && !USER_CMDIDX(ea.cmdidx)))
#else
valid_yank_reg(*ea.arg, ea.cmdidx != CMD_put)
#endif
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