Empty stack traces on assertions

[jeaye]

I think this could be a regression of #5. I can print (pst) and I'll get a very nice stack trace. Without it, I don't get any stack trace. Here's an example of the output I'm seeing:

jank.dev=> (run "test.jank")

java.lang.AssertionError: Assert failed: type error: unknown binding trace
                          condition
jank.dev=> (pst)
                     clojure.core/eval        core.clj: 3187
                                   ...
                    jank.dev/eval23915       REPL Input
                                   ...
                          jank.dev/run         dev.clj:    5
                          jank.dev/run         dev.clj:    9
                    clojure.core/apply        core.clj:  657
                                   ...
                       jank.core/-main        core.clj:    8
                       jank.core/-main        core.clj:   11
                 jank.type.check/check       check.clj:   40
                 jank.type.check/check       check.clj:   52
                                   ...
          jank.type.check/eval25963/fn       check.clj:  183
                                   ...
          jank.type.check/eval25980/fn       check.clj:  238
   jank.type.expression/call-signature  expression.clj:   40
                    clojure.core/apply        core.clj:  652
                      clojure.core/seq        core.clj:  137
                                   ...
                   clojure.core/map/fn        core.clj: 2726
jank.type.expression/call-signature/fn  expression.clj:   40
                                   ...
     jank.type.expression/eval25671/fn  expression.clj:  151
                                   ...
               jank.assert/type-assert      assert.clj:    6
               jank.assert/type-assert      assert.clj:    7
java.lang.AssertionError: Assert failed: type error: unknown binding trace
                          condition
nil
jank.dev=>

This is using [venantius/ultra "0.5.0"] and [org.clojure/clojure "1.9.0-alpha13"].

[venantius]

While this is likely, I'm working on a complete overhaul of Ultra's stacktrace engine, so I'm going to close this as it'll be irrelevant once that's complete.