Details
Enhancement
Closed
Minor
Description
There are a couple of wrong ways you can use a record initializer that don't produce errors in ClojureScript, just nils:
ClojureScript:cljs.user> (defrecord Thing [foo bar])
cljs.user/Thing
ClojureScript:cljs.user> (Thing. 1 2) ; correct usage
#cljs.user.Thing{:foo 1, :bar 2}
ClojureScript:cljs.user> (Thing. 1) ; wrong number of fields
#cljs.user.Thing{:foo 1, :bar nil}
ClojureScript:cljs.user> (Thing 1 2) ; forgetting the dot
nil
Compare Clojure:
user=> (defrecord Thing [foo bar])
user.Thing
user=> (Thing. 1 2)
#user.Thing{:foo 1, :bar 2}
user=> (Thing. 1)
CompilerException java.lang.IllegalArgumentException: No matching ctor found for class user.Thing, compiling:(/tmp/form-init7089728177345913731.clj:1:1)
user=> (Thing 1 2)
RuntimeException Expecting var, but Thing is mapped to class user.Thing clojure.lang.Util.runtimeException (Util.java:219)
It would make debugging easier if ClojureScript followed Clojure's example here and gave a useful error immediately in case of the last 2 examples.
Thanks for the report, these warnings would indeed be nice.