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Scala 3 migration warning for implicits found in package prefix
The implicit scope in Scala 3 no longer includes the requested type's package prefix
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| t12919-3cross.scala:23: error: No implicit Ordering defined for a.A. | ||
| def f(xs: List[a.A]) = xs.sorted // not found | ||
| ^ | ||
| 1 error |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| // scalac: -Xsource:3cross | ||
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| package object a { | ||
| implicit val aOrd: Ordering[A] = null | ||
| implicit val bOrd: Ordering[b.B] = null | ||
| } | ||
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| package a { | ||
| class A | ||
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| package aa { | ||
| class U { | ||
| def f(xs: List[a.A]) = xs.sorted // ok | ||
| def g(xs: List[b.B]) = xs.sorted // ok | ||
| } | ||
| } | ||
| } | ||
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| package b { | ||
| class B | ||
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| class V { | ||
| def f(xs: List[a.A]) = xs.sorted // not found | ||
| } | ||
| } | ||
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| package c { | ||
| import a._ | ||
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| class W { | ||
| def f(xs: List[a.A]) = xs.sorted // ok | ||
| def g(xs: List[b.B]) = xs.sorted // ok | ||
| } | ||
| } | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| t12919.scala:23: error: Implicit `a.aOrd` was found in package prefix of the required type, which is not part of the implicit search scope in Scala 3 | ||
| Scala 3 migration messages are errors under -Xsource:3. Use -Wconf / @nowarn to filter them or add -Xmigration to demote them to warnings. | ||
| Applicable -Wconf / @nowarn filters for this fatal warning: msg=<part of the message>, cat=scala3-migration, site=b.V.f | ||
| def f(xs: List[a.A]) = xs.sorted // warn | ||
| ^ | ||
| 1 error |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| // scalac: -Xsource:3 -Werror | ||
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| package object a { | ||
| implicit val aOrd: Ordering[A] = null | ||
| implicit val bOrd: Ordering[b.B] = null | ||
| } | ||
|
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||
| package a { | ||
| class A | ||
|
|
||
| package aa { | ||
| class U { | ||
| def f(xs: List[a.A]) = xs.sorted // ok | ||
| def g(xs: List[b.B]) = xs.sorted // ok | ||
| } | ||
| } | ||
| } | ||
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| package b { | ||
| class B | ||
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| class V { | ||
| def f(xs: List[a.A]) = xs.sorted // warn | ||
| } | ||
| } | ||
|
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| package c { | ||
| import a._ | ||
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| class W { | ||
| def f(xs: List[a.A]) = xs.sorted // ok | ||
| def g(xs: List[b.B]) = xs.sorted // ok | ||
| } | ||
| } | ||
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