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compiler/src/dotty/tools/dotc/typer Expand file tree Collapse file tree 2 files changed +7
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lines changed Original file line number Diff line number Diff line change @@ -888,8 +888,8 @@ class Namer { typer: Typer =>
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val unsafeInfo = if (isDerived) rhsBodyType else abstracted(rhsBodyType)
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def opaqueToBounds (info : Type ): Type =
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- if sym.isOpaqueAlias && info.typeParams.nonEmpty then
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- report.error(em " opaque type alias must be fully applied " , rhs.srcPos)
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+ if sym.isOpaqueAlias && info.typeParams.nonEmpty && info.hkResult.typeParams.nonEmpty then
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+ report.error(em " opaque type alias cannot have multiple type parameter lists " , rhs.srcPos)
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sym.opaqueToBounds(info, rhs1, tparamSyms)
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if (isDerived) sym.info = unsafeInfo
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trait Two [A , B ]
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- opaque type U [A ] = [B ] =>> Two [A , B ] // error: opaque type alias must be fully applied // error: cannot instantiate
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- opaque type T [A ] = [B ] =>> String // error: opaque type alias must be fully applied
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- opaque type S = [B ] =>> String // error: opaque type alias must be fully applied
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-
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+ opaque type U [A ] = [B ] =>> Two [A , B ] // error: opaque type alias cannot have multiple type parameter lists // error: cannot instantiate
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+ opaque type T = [A ] =>> [B ] =>> String // error: opaque type alias cannot have multiple type parameter lists
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+ opaque type S = [B ] =>> String // ok
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+ opaque type IArray [+ T ] = Array [? <: T ] // ok
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+ opaque type S2 [B ] = String // ok
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