It is unclear how to reproduce, but this is the original report.
The following REPL shows the problem:
From https://groups.google.com/d/msg/clojure-core-typed/uX2v9wbwTwI/yyErih2cPDMJ
Add passing unit test since we cannot reproduce.
Pull request: 34
Patch: ctyp-203.patch
Commit: 372108
Release: 0.3.8
osx yosemite, jdk 7