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Backport "fix scala 2 macros in traits with type parameters" to LTS #20699

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Jun 20, 2024
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Backport "fix scala 2 macros in traits with type parameters" to LTS #20699

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/core/SymDenotations.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1030,7 +1030,7 @@ object SymDenotations {

/** Is this a Scala 2 macro defined */
final def isScala2MacroInScala3(using Context): Boolean =
is(Macro, butNot = Inline) && is(Erased)
is(Macro, butNot = Inline) && flagsUNSAFE.is(Erased) // flag is set initially for macros - we check if it's a scala 2 macro before completing the type constructor so do not force the info to check the flag
// Consider the macros of StringContext as plain Scala 2 macros when
// compiling the standard library with Dotty.
// This should be removed on Scala 3.x
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14 changes: 14 additions & 0 deletions tests/pos-macros/i16630.scala
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@@ -0,0 +1,14 @@
import scala.language.experimental.macros
import scala.quoted.{Quotes, Expr, Type}

trait TraitWithTypeParam[A]:
inline def foo: Option[A] = ${ MacrosImpl.fooImpl[A] }
def foo: Option[A] = macro MacrosImpl.compatFooImpl[A]

object MacrosImpl:
def fooImpl[A: Type](using quotes: Quotes): Expr[Option[A]] = ???
def compatFooImpl[A: c.WeakTypeTag](c: Context): c.Tree = ???

trait Context:
type WeakTypeTag[A]
type Tree
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