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Don't search for implicit conversions to NoType #19563

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Merged
merged 1 commit into from
Jan 30, 2024
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Don't search for implicit conversions to NoType #19563

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/typer/Implicits.scala
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Expand Up @@ -1074,7 +1074,7 @@ trait Implicits:
if (argument.isEmpty) i"missing implicit parameter of type $pt after typer at phase ${ctx.phase.phaseName}"
else i"type error: ${argument.tpe} does not conform to $pt${err.whyNoMatchStr(argument.tpe, pt)}")

val usableForInference = !pt.unusableForInference
val usableForInference = pt.exists && !pt.unusableForInference
&& (argument.isEmpty || !argument.tpe.unusableForInference)

val result0 = if usableForInference then
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15 changes: 15 additions & 0 deletions tests/neg/i19320.scala
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@@ -0,0 +1,15 @@
//> using scala "3.3.1"
//> using dep org.http4s::http4s-ember-client:1.0.0-M40
//> using dep org.http4s::http4s-ember-server:1.0.0-M40
//> using dep org.http4s::http4s-dsl:1.0.0-M40

//import cats.effect.*
//import cats.implicits.*

class Concurrent[F[_]]

class Test[F[_]: Concurren]: // error
def hello = ???

object Test:
def apply[F[_]: Concurrent] = new Test[F]