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author | Martin Odersky <odersky@gmail.com> | 2005-10-06 13:14:33 +0000 |
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committer | Martin Odersky <odersky@gmail.com> | 2005-10-06 13:14:33 +0000 |
commit | 25a98964b5109aa55b71a8a26886c59903193548 (patch) | |
tree | 84b8fa154b5a0a2f36accd43d8d35926f6ba8579 /test-nsc/files/pos/bug31.scala | |
parent | 3b81e0cbac2fe51226472949ecde4d81b0e95412 (diff) | |
download | scala-25a98964b5109aa55b71a8a26886c59903193548.tar.gz scala-25a98964b5109aa55b71a8a26886c59903193548.tar.bz2 scala-25a98964b5109aa55b71a8a26886c59903193548.zip |
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Diffstat (limited to 'test-nsc/files/pos/bug31.scala')
-rwxr-xr-x | test-nsc/files/pos/bug31.scala | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/test-nsc/files/pos/bug31.scala b/test-nsc/files/pos/bug31.scala new file mode 100755 index 0000000000..92f33bfd02 --- /dev/null +++ b/test-nsc/files/pos/bug31.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); + System.out.println(arb(s)) + } + +} |