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I had a question...
Scala version: 2.13.16
class C { def g = { val t = Option((27, 42)) for { ns <- t (i, j) = ns } yield 42 } }
Does not warn unused i, j under -Wunused.
i
j
-Wunused
It correctly does not warn for the unused "intermediates" during the tupling map, but should warn because they are not used after that.
The existing test only verifies that it does not yield a false positive under -Wunused:-patvars (turned off).
-Wunused:-patvars
package <empty> { class C extends scala.AnyRef { def <init>(): C = { C.super.<init>(); () }; def g: Option[Int] = { val t: Option[(Int, Int)] = scala.Option.apply[(Int, Int)](scala.Tuple2.apply[Int, Int](17, 42)); t.map[((Int, Int), (Int, Int))](((ns: (Int, Int)) => { <synthetic> <artifact> private[this] val x$2: ((Int, Int), Int, Int) = (ns: (Int, Int) @unchecked) match { case (x$1 @ (_1: Int, _2: Int): (Int, Int)((i @ _), (j @ _))) => scala.Tuple3.apply[(Int, Int), Int, Int](x$1, i, j) }; val x$1: (Int, Int) = x$2._1; val i: Int = x$2._2; val j: Int = x$2._3; scala.Tuple2.apply[(Int, Int), (Int, Int)](ns, x$1) })).map[Int](((x$3: ((Int, Int), (Int, Int))) => (x$3: ((Int, Int), (Int, Int)) @unchecked) match { case (_1: (Int, Int), _2: (Int, Int)): ((Int, Int), (Int, Int))((ns @ _), (_1: Int, _2: Int): (Int, Int)((i @ _), (j @ _))) => 42 })) } } }
The text was updated successfully, but these errors were encountered:
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I had a question...
Reproduction steps
Scala version: 2.13.16
Problem
Does not warn unused
i
,j
under-Wunused
.It correctly does not warn for the unused "intermediates" during the tupling map, but should warn because they are not used after that.
The existing test only verifies that it does not yield a false positive under
-Wunused:-patvars
(turned off).The text was updated successfully, but these errors were encountered: