Weird exception when a string starts with a `/`

[viebel]

When a fact checks a string that starts with a /, an exception is thrown

Full repro:

Clojure 1.10.1
midje-nrepl 1.2.0-snapshot

/usr/local/bin/lein update-in :dependencies conj \[nrepl\ \"0.7.0\"\] -- update-in :plugins conj \[cider/cider-nrepl\ \"0.25.1\"\] -- update-in :plugins conj \[nubank/midje-nrepl\ \"1.2.0-snapshot\"\] -- repl 

nREPL server started on port 63847 on host 127.0.0.1 - nrepl://127.0.0.1:63847
REPL-y 0.4.4, nREPL 0.7.0
Clojure 1.10.1
Java HotSpot(TM) 64-Bit Server VM 1.8.0_121-b13
    Docs: (doc function-name-here)
          (find-doc "part-of-name-here")
  Source: (source function-name-here)
 Javadoc: (javadoc java-object-or-class-here)
    Exit: Control+D or (exit) or (quit)
 Results: Stored in vars *1, *2, *3, an exception in *e


user=> (use 'midje.repl)
nil
user=> (fact (identity "/gql") => "/gql" )

Syntax error macroexpanding clojure.core/defn at (target/b85b0c8b9ab53121a9a5c5886ffbb788ae0678fc-init.clj:1:1).
(identity "/gql")17819 - failed: simple-symbol? at: [:fn-name] spec: :clojure.core.specs.alpha/defn-args