ClassNotFoundException when evaluating inline def which calls a macro defined in a super-class

[smarter]

Compiler version

3.3.0

Minimized code

Macro_1.scala:

package defn

import scala.quoted.*

abstract class Macro {
  def impl()(using Quotes): Expr[Int] = '{1}
}

Inline_2.scala:

package user

import defn.Macro

object Inline extends Macro {
  inline def callMacro(): Int =
    ${ this.impl() }
}

Test_2.scala:

package user

object Test {
  Inline.callMacro()
}

$ mkdir out1 out2
$ scalac Macro_1.scala -d out1
$ scalac -classpath out1 -d out2 Inline_2.scala Test_2.scala
-- Error: Test_2.scala:4:18 ----------------------------------------------------
4 |  Inline.callMacro()
  |  ^^^^^^^^^^^^^^^^^^
  |Failed to evaluate macro.
  |  Caused by class java.lang.ClassNotFoundException: user.Inline$
  |    java.lang.ClassLoader.loadClass(ClassLoader.java:418)
  |    java.lang.ClassLoader.loadClass(ClassLoader.java:351)
  |    dotty.tools.dotc.quoted.Interpreter.loadClass(Interpreter.scala:214)
  |    dotty.tools.dotc.quoted.Interpreter.loadModule(Interpreter.scala:199)
  |    dotty.tools.dotc.quoted.Interpreter.liftedTree1$1(Interpreter.scala:165)
  |    dotty.tools.dotc.quoted.Interpreter.interpretedStaticMethodCall(Interpreter.scala:170)
  |    dotty.tools.dotc.quoted.Interpreter.interpretTree(Interpreter.scala:85)
  |    dotty.tools.dotc.transform.Splicer$SpliceInterpreter.interpretTree(Splicer.scala:247)
  |    dotty.tools.dotc.quoted.Interpreter.interpretTree$$anonfun$2(Interpreter.scala:95)
  |
1 error found

Weirdly enough, if the package where the inline definition is present exists on the classpath, then it works:

$ mkdir out1/user
$ scalac -classpath out1 -d out2 Inline_2.scala Test_2.scala
$

Expectation

Successful compilation.

[nicolasstucki]

We should suspend the compilation of Test_2.scala. Compiling this with -Xprint-suspension we do not see any suspensions.

[michelou]

Backport candidate to 3.3.1 branch ?!