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author | Martin Odersky <odersky@gmail.com> | 2003-07-08 13:19:33 +0000 |
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committer | Martin Odersky <odersky@gmail.com> | 2003-07-08 13:19:33 +0000 |
commit | fedbced652b533da4baeea37c39c058d2cd2afd8 (patch) | |
tree | 6abfe4284db8f92c12fba14d671de6f7b827068e /test/files/pos/bug31.scala | |
parent | 639f1084419fb54acf6ee9f6c405e302ba21abd3 (diff) | |
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Diffstat (limited to 'test/files/pos/bug31.scala')
-rw-r--r-- | test/files/pos/bug31.scala | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/test/files/pos/bug31.scala b/test/files/pos/bug31.scala new file mode 100644 index 0000000000..607dd4ce4f --- /dev/null +++ b/test/files/pos/bug31.scala @@ -0,0 +1,29 @@ +object Main { + + trait Ensure[a] { + def ensure(postcondition: a => Boolean): a + } + + def require[a](def precondition: Boolean)(def 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)) + } + +} |