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author | michelou <michelou@epfl.ch> | 2007-04-05 12:59:40 +0000 |
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committer | michelou <michelou@epfl.ch> | 2007-04-05 12:59:40 +0000 |
commit | b5b3ce4df69c6dd19506cd332a97c1ad6660e4a5 (patch) | |
tree | dd28bb694890839d94974e7c0ba52c9d3f7e12e0 /test/files/pos/bug0031.scala | |
parent | 7674f974c372ab1949a19490b48e5734711ded84 (diff) | |
download | scala-b5b3ce4df69c6dd19506cd332a97c1ad6660e4a5.tar.gz scala-b5b3ce4df69c6dd19506cd332a97c1ad6660e4a5.tar.bz2 scala-b5b3ce4df69c6dd19506cd332a97c1ad6660e4a5.zip |
4-digits numbering
Diffstat (limited to 'test/files/pos/bug0031.scala')
-rw-r--r-- | test/files/pos/bug0031.scala | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/test/files/pos/bug0031.scala b/test/files/pos/bug0031.scala new file mode 100644 index 0000000000..aa787ca794 --- /dev/null +++ b/test/files/pos/bug0031.scala @@ -0,0 +1,29 @@ +object Main { + + trait Ensure[a] { + def ensure(postcondition: a => Boolean): a + } + + def require[a](precondition: => Boolean)(command: => a): Ensure[a] = + if (precondition) + new Ensure[a] { + def ensure(postcondition: a => Boolean): a = { + val result = command; + if (postcondition(result)) result + else error("Assertion error") + } + } + else + error("Assertion error"); + + def arb[a](s: List[a]) = + require (! s.isEmpty) { + s.head + } ensure (result => s contains result); + + def main(args: Array[String]) = { + val s = List(1, 2); + Console.println(arb(s)) + } + +} |