From f8a5424188e3671e59671b6997b18209e87f3fe4 Mon Sep 17 00:00:00 2001
From: Olivier Blanvillain <olivier.blanvillain@gmail.com>
Date: Fri, 12 Jul 2019 16:03:37 +0200
Subject: [PATCH] Handle $asInstanceOf$ in Splicer

Before that commit macro expansion would fail with:

"Could not find method Box$.$asInstanceOf$ with parameters (). The most common reason for that is that you apply macros in the compilation run that defines them"
---
 .../src/dotty/tools/dotc/transform/Splicer.scala     |  9 ++++++---
 tests/run-macros/dollar-asInstanceOf-dollar/1.scala  | 12 ++++++++++++
 tests/run-macros/dollar-asInstanceOf-dollar/2.scala  |  4 ++++
 3 files changed, 22 insertions(+), 3 deletions(-)
 create mode 100644 tests/run-macros/dollar-asInstanceOf-dollar/1.scala
 create mode 100644 tests/run-macros/dollar-asInstanceOf-dollar/2.scala

diff --git a/compiler/src/dotty/tools/dotc/transform/Splicer.scala b/compiler/src/dotty/tools/dotc/transform/Splicer.scala
index f37e1d9d1d31..1a1db7b33673 100644
--- a/compiler/src/dotty/tools/dotc/transform/Splicer.scala
+++ b/compiler/src/dotty/tools/dotc/transform/Splicer.scala
@@ -193,8 +193,12 @@ object Splicer {
           val staticMethodCall = interpretedStaticMethodCall(fn.symbol.owner, fn.symbol)
           staticMethodCall(args.flatten.map(interpretTree))
         } else if (fn.qualifier.symbol.is(Module) && fn.qualifier.symbol.isStatic) {
-          val staticMethodCall = interpretedStaticMethodCall(fn.qualifier.symbol.moduleClass, fn.symbol)
-          staticMethodCall(args.flatten.map(interpretTree))
+          if (fn.name == nme.asInstanceOfPM) {
+            interpretModuleAccess(fn.qualifier.symbol)
+          } else {
+            val staticMethodCall = interpretedStaticMethodCall(fn.qualifier.symbol.moduleClass, fn.symbol)
+            staticMethodCall(args.flatten.map(interpretTree))
+          }
         } else if (env.contains(fn.name)) {
           env(fn.name)
         } else if (tree.symbol.is(InlineProxy)) {
@@ -265,7 +269,6 @@ object Splicer {
 
       val name = getDirectName(fn.info.finalResultType, fn.name.asTermName)
       val method = getMethod(clazz, name, paramsSig(fn))
-
       (args: List[Object]) => stopIfRuntimeException(method.invoke(inst, args: _*))
     }
 
diff --git a/tests/run-macros/dollar-asInstanceOf-dollar/1.scala b/tests/run-macros/dollar-asInstanceOf-dollar/1.scala
new file mode 100644
index 000000000000..482d105c0595
--- /dev/null
+++ b/tests/run-macros/dollar-asInstanceOf-dollar/1.scala
@@ -0,0 +1,12 @@
+import scala.quoted._
+import scala.deriving._
+
+case class Box[A](x: A)
+
+object Macro {
+  inline def foo[X[_]](implicit inline m: Mirror { type MirroredType = X }): Int =
+    ${ fooImpl }
+
+  def fooImpl[X[_]](implicit m: Mirror { type MirroredType = X }, qc: QuoteContext): Expr[Int] =
+    '{ 1 }
+}
diff --git a/tests/run-macros/dollar-asInstanceOf-dollar/2.scala b/tests/run-macros/dollar-asInstanceOf-dollar/2.scala
new file mode 100644
index 000000000000..fe38b9be821e
--- /dev/null
+++ b/tests/run-macros/dollar-asInstanceOf-dollar/2.scala
@@ -0,0 +1,4 @@
+object Test {
+  def main(args: Array[String]): Unit =
+    assert(Macro.foo[Box] == 1)
+}