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If you can't get your hands on something which crashes
scalac - I know, I know - you can try this ready-made crasher.
% cat test/pending/pos/t4717.scala
trait Bounds[@specialized A] {
// okay without `>: A`
def x[B >: A]: Unit = new Bounds[B] {
lazy val it = ??? // def or val okay
it
}
}
% scalac -d /tmp test/pending/pos/t4717.scala
error:
while compiling: test/pending/pos/t4717.scala
during phase: specialize
library version: version 2.10.0-20120510-134429-ce1d68ed19
compiler version: version 2.10.0-20120510-152646-ba4dfd1e63
reconstructed args: -d /tmp
last tree to typer: Select(This(trait Bounds$mcZ$sp), x$mcZ$sp)
symbol: method x$mcZ$sp in trait Bounds$mcZ$sp (flags: override <method> <specialized>)
symbol definition: override def x$mcZ$sp[B >: Boolean](): Unit
tpe: [B >: Boolean]()Unit
symbol owners: method x$mcZ$sp -> trait Bounds$mcZ$sp -> package <empty>
context owners: value it -> anonymous class $anon -> method x$mcZ$sp -> trait Bounds$mcZ$sp -> package <empty>
== Enclosing template or block ==
Block(
Assign(
$anon.this."it "
Apply( // def ???(): Nothing in object Predef, tree.tpe=Nothing
scala.this."Predef"."$qmark$qmark$qmark" // def ???(): Nothing in object Predef, tree.tpe=()Nothing
Nil
)
)
$anon.this."it " // lazy private[this] var it: Nothing, tree.tpe=Nothing
)
== Expanded type of tree ==
PolyType(
typeParams = List(TypeParam(B >: Boolean))
resultType = NullaryMethodType(
resultType = TypeRef(TypeSymbol(final class Unit extends AnyVal))
)
)
// And then the usual stack trace
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