Macro sample code:
package macros
import scala.reflect.macros.whitebox.Context
import scala.language.experimental.macros
import scala.annotation.StaticAnnotation
class Ant extends StaticAnnotation {
def macroTransform(annottees: Any*): Unit = macro Ant.impl
}
object Ant {
def impl(c: Context)(annottees: c.Tree*): c.Tree = {
import c.universe._
c.internal.enclosingOwner.asType.toType // this line is Ok
// ! Any commented line below causes the same compilation error
// c.internal.enclosingOwner.asType.toType.decls
// c.mirror.staticClass(c.internal.enclosingOwner.fullName + ".A".toString)
// c.typecheck(annottees.head)
q"""implicit class A(val v: Int) extends AnyVal { def ask() = println("ok") }"""
}
}
Changing whitebox.Context to macros.Context or blackbox.Context does not help. Changing arguments withImplicitViewsDisabled=true, or withMacrosDisabled=true has no effect.
Exec sample code:
package test
import macros.Ant
object Test extends App {
val a = new A(42)
a.ask() // Output should be "ok" (not 42)
// ! removing [implicit] lets code be compiled
@Ant implicit class A(v: Int) { def ask() = println(v)}
}
So, removing line c.typecheck(annottees.head) and / or word implicit in line @Ant implicit class A(v: Int) lets code be compiled. Otherwise compilation crashes with error:
Error:scalac:
no progress in completing object Test: <?>
while compiling: D:\Projects\_Schemee\TestMacro1\src\test\Test.scala
during phase: globalPhase=typer, enteringPhase=namer
library version: version 2.11.6
compiler version: version 2.11.6
reconstructed args: -nobootcp -classpath ...
last tree to typer: Ident(v)
tree position: <unknown>
tree tpe: Int
symbol: value v
symbol definition: v: Int (a TermSymbol)
symbol package: test
symbol owners: value v -> method A -> object Test
call site: method A in object Test in package test
<Cannot read source file>
Compiled under latest IntelliJ. With and without Sbt.
The question is: how to use typecheck in macro annotation with implicit classes? (or am i missing something?)
EDITED:
Besides that that error is caused when trying to access enclosingOwner declarations or mirror class A "manually".
It looks like an sbt bug or interaction with compiler behavior.
The original exception:
java.lang.NullPointerException
at xsbt.Dependency$ExtractDependenciesByMemberRefTraverser$$anonfun$1.isDefinedAt(Dependency.scala:142)
That location:
val typeSymbolCollector = new CollectTypeTraverser({
case tpe if !tpe.typeSymbol.isPackage => tpe.typeSymbol
})
The traverser has a comment suggesting similar issues:
/*
* Some macros appear to contain themselves as original tree.
* We must check that we don't inspect the same tree over and over.
* See https://issues.scala-lang.org/browse/SI-8486
* https://github.com/sbt/sbt/issues/1237
* https://github.com/sbt/sbt/issues/1544
*/
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