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object Test {
def check(a: Range, b: Range) = (a == b) == (a.toList == b.toList)
def main(args: Array[String]): Unit = {
val lo = -2 to 2
val hi = lo
val step = List(-6,-2,-1,1,2,6)
for (i <- lo; j <- hi; n <- step; k <- lo; l <- hi; m <- step) {
assert(
check(i until j by n, k until l by m) &&
check(i until j by n, k to l by m) &&
check(i to j by n, k until l by m) &&
check(i to j by n, k to l by m)
)
}
}
}
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