Use final result type to check selector bound

scala · Jun 29, 2024 · 634fdb0 · 634fdb0
1 parent 10efba5
commit 634fdb0
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala b/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala
@@ -729,7 +729,7 @@ object CheckUnused:
             if selector.isGiven then
               // Further check that the symbol is a given or implicit and conforms to the bound
               sym.isOneOf(Given | Implicit)
-                && (selector.bound.isEmpty || sym.info <:< selector.boundTpe)
+                && (selector.bound.isEmpty || sym.info.finalResultType <:< selector.boundTpe)
                 && selData.qualTpe =:= prefix
             else
               // Normal wildcard, check that the symbol is not a given (but can be implicit)

diff --git a/tests/warn/i19657.scala b/tests/warn/i19657.scala
@@ -30,3 +30,7 @@ def `i19657 check prefix to pick specific selector`: Unit =
   import FooCodec.given_Schema_A
   import BarCodec.given_Schema_A
   summonSchemas
+
+def `i20860 use result to check selector bound`: Unit =
+  import Ordering.Implicits.given Ordering[?]
+  summon[Ordering[Seq[Int]]]