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Fix #6055: Use correct condition for non-alias opaque types #6106

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Merged
merged 1 commit into from
Mar 19, 2019
Merged

Fix #6055: Use correct condition for non-alias opaque types #6106

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/ast/Desugar.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -774,7 +774,7 @@ object desugar {
* companion object, and the synthetic opaque type member will go into the self type.
*/
def opaqueAlias(tdef: TypeDef)(implicit ctx: Context): Tree =
if (tdef.rhs.isInstanceOf[TypeBoundsTree]) {
if (lacksDefinition(tdef)) {
ctx.error(em"opaque type ${tdef.name} must be an alias type", tdef.sourcePos)
tdef.withFlags(tdef.mods.flags &~ Opaque)
}
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5 changes: 5 additions & 0 deletions tests/neg/i6055.scala
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@@ -0,0 +1,5 @@
opaque type i0 // error: opaque type must be an alias type
opaque type i2 <: Int // error: opaque type must be an alias type

opaque type i1[_] // error: opaque type must be an alias type
opaque type x[_] <: Int // error: opaque type must be an alias type