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| author | Martin Odersky <odersky@gmail.com> | 2017-02-01 17:18:13 +1100 |
|---|---|---|
| committer | Martin Odersky <odersky@gmail.com> | 2017-02-01 17:48:32 +1100 |
| commit | e34555f69e7cdd6d19d0d1ed969127f4ee65c36e (patch) | |
| tree | 9b3011bf3074f1d1d8e7d815814b8ed370d98639 /compiler/src/dotty | |
| parent | b11e6d678a92187e5e9f821ba1116cec2cce0f8c (diff) | |
| download | dotty-e34555f69e7cdd6d19d0d1ed969127f4ee65c36e.tar.gz dotty-e34555f69e7cdd6d19d0d1ed969127f4ee65c36e.tar.bz2 dotty-e34555f69e7cdd6d19d0d1ed969127f4ee65c36e.zip | |
Disallow taking a class tag of Nothing or Null.
It seems in most cases this leads to weird behavior and cause
confusing error messages later.
It also means we cannot create an Array[Nothing], except by
passing the classtag explicitly.
Diffstat (limited to 'compiler/src/dotty')
| -rw-r--r-- | compiler/src/dotty/tools/dotc/typer/Implicits.scala | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/src/dotty/tools/dotc/typer/Implicits.scala b/compiler/src/dotty/tools/dotc/typer/Implicits.scala index 2112b1221..f7d8556a7 100644 --- a/compiler/src/dotty/tools/dotc/typer/Implicits.scala +++ b/compiler/src/dotty/tools/dotc/typer/Implicits.scala @@ -521,6 +521,8 @@ trait Implicits { self: Typer => val etag = inferImplicitArg(defn.ClassTagType.appliedTo(elemTp), error, pos) if (etag.isEmpty) etag else etag.select(nme.wrap) case tp if hasStableErasure(tp) => + if (defn.isBottomClass(tp.typeSymbol)) + error(where => i"attempt to take ClassTag of undetermined type for $where") ref(defn.ClassTagModule) .select(nme.apply) .appliedToType(tp) |