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author | Samuel Gruetter <samuel.gruetter@epfl.ch> | 2014-03-12 22:44:33 +0100 |
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committer | Samuel Gruetter <samuel.gruetter@epfl.ch> | 2014-03-12 22:44:33 +0100 |
commit | 9ef5f6817688f814a3450126aa7383b0928e80a0 (patch) | |
tree | 5727a2f7f7fd665cefdb312af2785c692f04377c /tests/untried/pos/t267.scala | |
parent | 194be919664447631ba55446eb4874979c908d27 (diff) | |
download | dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.tar.gz dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.tar.bz2 dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.zip |
add tests from scala/test/files/{pos,neg}
with explicit Unit return type
Diffstat (limited to 'tests/untried/pos/t267.scala')
-rw-r--r-- | tests/untried/pos/t267.scala | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/tests/untried/pos/t267.scala b/tests/untried/pos/t267.scala new file mode 100644 index 000000000..7e5876eae --- /dev/null +++ b/tests/untried/pos/t267.scala @@ -0,0 +1,55 @@ +package expAbstractData + +/** A base class consisting of + * - a root trait (i.e. abstract class) `Exp' with an `eval' function + * - an abstract type `exp' bounded by `Exp' + * - a concrete instance class `Num' of `Exp' for numeric literals + */ +trait Base { + type exp <: Exp + + trait Exp { + def eval: Int + } + class Num(v: Int) extends Exp { self: exp => + val value = v + def eval = value + } +} + +object testBase extends App with Base { + type exp = Exp + val term = new Num(2); + Console.println(term.eval) +} + +/** Data extension: An extension of `Base' with `Plus' expressions + */ +trait BasePlus extends Base { + class Plus(l: exp, r: exp) extends Exp { self: exp => + val left = l + val right = r + def eval = left.eval + right.eval + } +} + +/** Operation extension: An extension of `Base' with 'show' methods. + */ +trait Show extends Base { + type exp <: Exp1 + + trait Exp1 extends Exp { + def show: String + } + class Num1(v: Int) extends Num(v) with Exp1 { self: exp with Num1 => + def show = value.toString() + } +} + +/** Operation extension: An extension of `BasePlus' with 'show' methods. + */ +trait ShowPlus extends BasePlus with Show { + class Plus1(l: exp, r: exp) extends Plus(l, r) with Exp1 { self: exp with Plus1 => + def show = left.show + " + " + right.show + } +} |