1) add (catch :default _) to mean (catch Throwable _) 2) add (catch :default _) to mean (catch Exception _) 3) add (catch :all _) to mean (catch Throwable _)
This patch is more permissive than my patch for CLJS: The CLJS patch ensures :default catch blocks occur between non-default catch blocks and finally blocks, if present. This patch just makes (catch :default ...) a synonym for (catch Throwable ...). I wanted to keep the change to the compiler minimum.
Major
Clojurescript has this to expose the untyped catch, which is equivalent to (catch Throwable _) on java.
http://dev.clojure.org/jira/browse/CLJS-661
Proposals
1) add (catch :default _) to mean (catch Throwable _)
2) add (catch :default _) to mean (catch Exception _)
3) add (catch :all _) to mean (catch Throwable _)
Please see design page for discussion of proposals: http://dev.clojure.org/display/design/Platform+Errors
Patches
v001 implements just 1)
This patch is more permissive than my patch for CLJS: The CLJS patch ensures :default catch blocks occur between non-default catch blocks and finally blocks, if present. This patch just makes (catch :default ...) a synonym for (catch Throwable ...). I wanted to keep the change to the compiler minimum.
Open Question: Catch Throwable (patch v001 does this) or Exception? Alternatively, a more carefully crafted list of "non-fatal" errors. See Scala's NonFatal pattern extractor: http://www.scala-lang.org/api/current/scala/util/control/NonFatal$.html
v002 implements 2) + 3)
This builds on v001, so the same caveat about clause ordering applies.
v003 implements just 2)
This builds on v001, so the same caveat about clause ordering applies.