vim --cmd "$(printf 'func! XX()\nechomsg "aa"\nendfunc')"
 works fine but 
vim --cmd "$(printf 'func! XX()\nechomsg "aa"\nendfunc\ncall XX()')"
 does not. One would expect at least an error about 'trailing characters' as 
vim does in some similar situations, expect for 'endfunc "comment' (and perhaps 
also allow 'endfunc FuncName' if someone does that already, but I haven't seen 
it)

Some discussion in 
https://github.com/neovim/neovim/pull/6844#issuecomment-309213209 and below

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