Are we generally agreed that we want to preserve the body exception,
if any, else the close exception, if any, else the body return value?
Then, without further ado:
(defmacro with-open2 [binding-exprs & body]
(if (> (count binding-exprs) 2)
`(with-open2 ~(vec (take 2 binding-exprs))
(with-open2 ~(vec (drop 2 binding-exprs))
~@body))
(let [[sym expr] binding-exprs]
`(let [~sym ~expr
res# (try
[(do ~@body)]
(catch Throwable t# t#))]
(if (vector? res#) ; body didn't throw
(do
(.close ~sym) ; so let close throw
(res# 0))
(do ; body threw
(try (.close ~sym) (catch Throwable _#)) ; eat close exception
(throw res#))))))) ; and rethrow body exception
user=> (with-open [x (Foo.)] (doit x))
#<CompilerException java.lang.Exception: close exception (NO_SOURCE_FILE:242)>
user=> (with-open2 [x (Foo.)] (doit x))
#<CompilerException java.lang.Exception: doit exception (NO_SOURCE_FILE:40)>
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