weird bash5 bug with ``for i; do echo; done; echo in''

[Clark Wang]

Hi Chet,

Today I compiled bash5 (using default configuration) from the devel branch
(f602026a0ce - commit bash-20180316 snapshot) on macOS and found it breaks
one of my rc files. After some time of debugging I have the following
minimal example to reproduce the problem:

$ bash5 -c 'for i; do echo; done; echo in'
bash5: -c: line 0: syntax error near unexpected token `in'
bash5: -c: line 0: `for i; do echo; done; echo in'
$

Please take a look.

-clark