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Diffstat (limited to 'src/dotty/tools/dotc/typer/Typer.scala')
| -rw-r--r-- | src/dotty/tools/dotc/typer/Typer.scala | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/dotty/tools/dotc/typer/Typer.scala b/src/dotty/tools/dotc/typer/Typer.scala index 33ec156a1..4441adcfb 100644 --- a/src/dotty/tools/dotc/typer/Typer.scala +++ b/src/dotty/tools/dotc/typer/Typer.scala @@ -782,7 +782,10 @@ class Typer extends Namer with TypeAssigner with Applications with Implicits wit def typedSingletonTypeTree(tree: untpd.SingletonTypeTree)(implicit ctx: Context): SingletonTypeTree = track("typedSingletonTypeTree") { val ref1 = typedExpr(tree.ref) - checkStable(ref1.tpe, tree.pos) + val illegal = Set[Symbol](defn.NullClass, defn.SymbolClass) + val refSym = ref1.tpe.widen.typeSymbol + if (illegal contains refSym) ctx.error(i"$refSym is not a legal singleton constant type", tree.pos) + else checkStable(ref1.tpe, tree.pos) assignType(cpy.SingletonTypeTree(tree)(ref1), ref1) } |