defstruct :predicate failure

[Daniel Kochmański]

Hey,

thank you for the report. This issue has been fixed around a year ago: 
b6a4d4a85148dfc0561981e7e65fcf2224ddb2a2
(reported here: 
https://gitlab.com/embeddable-common-lisp/ecl/issues/385). This change 
is not
part of the release yet (fix was applied in 2017-05-30 while 16.1.3 was 
released in 2016-12-19).

If you are interested what we want to solve before we release 16.2.0 you 
may check out the
milestone in here: 
https://gitlab.com/embeddable-common-lisp/ecl/issues?milestone_title=ECL+16.2.0

Best regards,
Daniel

> (defstruct (foo (:type vector) (:predicate nil)) qux bar)