Cannot load Leiningen project.clj due to "Must hint overloaded method: toArray"

[johanhaleby]

When I try to open a project in Intellij 2019.1 with Cursive 1.8.1 and JDK 11 I run into this issue:

10:39	Error reading /Users/johan/path/app/project.clj
		Syntax error compiling deftype* at (clojure/core/rrb_vector/rrbt.clj:282:1).
		Must hint overloaded method: toArray

Afterwards Cursive shows me all kinds of "error highlights" in the UI making the IDE unusable. Maybe it's related to this clojure issue?

[johanhaleby]

The problem was caused by me having defined venantius/ultra in my Leiningen profiles.clj. As indicated in venantius/ultra#90 the work-around for ultra is by excluding org.clojure/clojure and org.clojure/core.rrb-vector:

{:user {:plugins            						
           [[venantius/ultra "0.6.0" :exclusions [org.clojure/clojure org.clojure/core.rrb-vector]]]
,,,}

This also fixed the problems with Cursive.