From Martin Maechler <maechler@stat.math.ethz.ch>  Thu Nov  6 08:12:47 1997
From: Martin Maechler <maechler@stat.math.ethz.ch> (Martin Maechler)
Date: Thu, 6 Nov 1997 09:12:47 +0100
Subject: R-alpha: "invisible" (yet again): a more problematic bug[let]
Message-ID: <199711060812.JAA04845@sophie.ethz.ch>

I think this is a more problematic buglet
in (implicit/explicit)  ``invisible behavior'').

Try this  (all versions of R from  0.49 to 0.60):


test0 <- function() c(1,2)
test  <- function(two = FALSE)        c(1, if(two) 2)
testR <- function(two = FALSE) return(c(1, if(two) 2))

test0()# 1 2 as it should
test() # <<<<<<<<<<<<<<<<<<<<<< INVISIBLE! @#$@!
test(T)# 1 2
print(test())
print(test(T))

testR() # ok; NOT invisible...
testR(T)# 1 2

---------------------------
Even though it is not really harmful once you know about it,
it can be pretty wierd when you try and test functions...

-- Martin
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R-alpha: "invisible" (yet again): a more problematic bug[let]
Martin Maechler