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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| t12240.scala:21: warning: match may not be exhaustive. | ||
| def guardedNonExhaustive(x: Int) = x match { | ||
| ^ | ||
| t12240.scala:25: warning: match may not be exhaustive. | ||
| def guardedSeqNonExhaustive(x: Int) = x match { | ||
| ^ | ||
| t12240.scala:32: warning: match may not be exhaustive. | ||
| It would fail on the following input: Vector1() | ||
| def reported(v: Vector[String]) = v match { | ||
| ^ | ||
| error: No warnings can be incurred under -Werror. | ||
| 3 warnings | ||
| 1 error |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| // scalac: -Xfatal-warnings -Xlint:strict-unsealed-patmat | ||
| // | ||
|
|
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| object Test { | ||
|
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| //see also pos/t12240.scala | ||
|
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| class IrrefutableNameBasedResult[Result](r: Result) { | ||
| def isEmpty: false = false | ||
| def get: Result = r | ||
| } | ||
|
|
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| object IrrefutableIdentityExtractor { | ||
| def unapply[A](a: A): IrrefutableNameBasedResult[A] = new IrrefutableNameBasedResult(a) | ||
| } | ||
|
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| object IrrefutableSeqExtractor { | ||
| def unapplySeq[A](a: A) = new IrrefutableNameBasedResult(List(a)) | ||
| } | ||
|
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| def guardedNonExhaustive(x: Int) = x match { | ||
| case IrrefutableIdentityExtractor(_) if false => "non-exhautive" | ||
| } | ||
|
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| def guardedSeqNonExhaustive(x: Int) = x match { | ||
| case IrrefutableSeqExtractor(_*) if false => "non-exhaustive" | ||
| } | ||
|
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| //status quo: | ||
| //should be in pos/t12240.scala but isn't exhaustive per | ||
| //per https://github.com/scala/bug/issues/12252 | ||
| def reported(v: Vector[String]) = v match { | ||
| case Vector() => "empty" | ||
| case Vector(_) => "one" | ||
| case Vector(_, _, _*) => "scalac doesn't now this is exhaustive" | ||
| } | ||
|
|
||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| // scalac: -Xfatal-warnings -Xlint:strict-unsealed-patmat | ||
| // | ||
|
|
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| object Test { | ||
|
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| //original reports | ||
|
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| def originalReported(v: Vector[String]) = v match { | ||
| case Vector() => "empty" | ||
| case Vector(_) => "one" | ||
| case Vector(_*) => "this pattern is irrefutable" | ||
| } | ||
|
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| def originalMinimized(v: Vector[String]) = v match { | ||
| case Vector(_*) => "this pattern is irrefutable" | ||
| } | ||
|
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| //broader applicability | ||
|
|
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| class IrrefutableNameBasedResult[Result](r: Result) { | ||
| def isEmpty: false = false | ||
| def get: Result = r | ||
| } | ||
|
|
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| object IrrefutableIdentityExtractor { | ||
| def unapply[A](a: A) = new IrrefutableNameBasedResult(a) | ||
| } | ||
|
|
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| object IrrefutableSeqExtractor { | ||
| def unapplySeq[A](a: A) = new IrrefutableNameBasedResult(List(a)) | ||
| } | ||
|
|
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| def nameBasedPatternIsExhaustive(x: Int) = x match { | ||
| case IrrefutableIdentityExtractor(_) => "exhaustive" | ||
| } | ||
|
|
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| def nameBasedSeqIsExhaustive(x: Int) = x match { | ||
| case IrrefutableSeqExtractor(_*) => "exhaustive" | ||
| } | ||
|
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| //status quo: | ||
| //should be in neg/t12240.scala but isn't exhaustive per | ||
| //per https://github.com/scala/bug/issues/12252 | ||
|
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| def reported(v: Vector[String]) = v match { | ||
| case Vector() => "empty" | ||
| case Vector(_) => "one" | ||
| case Vector(_, _, _*) => "this ought to be exhaustive" | ||
| case Vector(_*) => "scalac doesn't know it's not exhaustive" | ||
| } | ||
|
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| //status quo: | ||
| //should be in neg/t12240.scala, but the unreachable code isn't reported | ||
| //per https://github.com/scala/bug/issues/12251 | ||
| def nameBasedPatternUnreachable(x: Int) = x match { | ||
| case IrrefutableIdentityExtractor(_) => "exhaustive" | ||
| case _ => "unreachable" | ||
| } | ||
|
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| def nameBasedSeqUnreachable(x: Int) = x match { | ||
| case IrrefutableSeqExtractor(_*) => "exhaustive" | ||
| case _ => "unreachable" | ||
| } | ||
|
|
||
| } |
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