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SI-6675 -Xlint arity enforcement for extractors
Extractor Patterns changed in 2.10.0 to implement the letter of the spec, which allows a single binding to capture an entire TupleN. But this can hide arity mismatches, especially if the case body uses the bound value as an `Any`. This change warns when this happens under -Xlint.
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Original file line number | Diff line number | Diff line change |
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t6675.scala:10: error: extractor pattern binds a single value to a Product3 of type (Int, Int, Int) | ||
"" match { case X(b) => b } // should warn under -Xlint. Not an error because of SI-6111 | ||
^ | ||
one error found |
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Original file line number | Diff line number | Diff line change |
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-Xlint -Xfatal-warnings |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,13 @@ | ||
object X { | ||
def unapply(s: String): Option[(Int,Int,Int)] = Some((1,2,3)) | ||
} | ||
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object Y { | ||
def unapplySeq(s: String): Option[Seq[(Int,Int,Int)]] = Some(Seq((1,2,3))) | ||
} | ||
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object Test { | ||
"" match { case X(b) => b } // should warn under -Xlint. Not an error because of SI-6111 | ||
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"" match { case Y(b) => b } // no warning | ||
} |