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| author | Martin Odersky <odersky@gmail.com> | 2015-07-14 12:49:09 +0200 |
|---|---|---|
| committer | Martin Odersky <odersky@gmail.com> | 2015-09-18 18:05:15 +0200 |
| commit | 0bdee32e8b35b6c994248def87cb8f6f874572dd (patch) | |
| tree | 659e087d649d299ec4deff363a6da0836b5d6158 | |
| parent | b10b93e6f8bdee650ccbe588db476bd0c8c8819c (diff) | |
| download | dotty-0bdee32e8b35b6c994248def87cb8f6f874572dd.tar.gz dotty-0bdee32e8b35b6c994248def87cb8f6f874572dd.tar.bz2 dotty-0bdee32e8b35b6c994248def87cb8f6f874572dd.zip | |
Black hole detection for LazyRefs
Now catches attempts to recursively force a LazyRef type
that's in train of being evaluated.
| -rw-r--r-- | src/dotty/tools/dotc/core/Types.scala | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/src/dotty/tools/dotc/core/Types.scala b/src/dotty/tools/dotc/core/Types.scala index 358720836..6797836cf 100644 --- a/src/dotty/tools/dotc/core/Types.scala +++ b/src/dotty/tools/dotc/core/Types.scala @@ -1815,7 +1815,16 @@ object Types { } case class LazyRef(refFn: () => Type) extends UncachedProxyType with ValueType { - lazy val ref = refFn() + private var myRef: Type = null + private var computed = false + lazy val ref = { + if (computed) assert(myRef != null) + else { + computed = true + myRef = refFn() + } + myRef + } override def underlying(implicit ctx: Context) = ref override def toString = s"LazyRef($ref)" override def equals(other: Any) = other match { |