Fix #9484: Use new macro classloader to process suspended units

compiler/src/dotty/tools/dotc/Driver.scala

@@ -37,7 +37,7 @@ class Driver {
         val run = compiler.newRun
         run.compile(fileNames)
 
-        def finish(run: Run): Unit =
+        def finish(run: Run)(using Context): Unit =
           run.printSummary()
           if !ctx.reporter.errorsReported && run.suspendedUnits.nonEmpty then
             val suspendedUnits = run.suspendedUnits.toList
@@ -46,7 +46,7 @@ class Driver {
             val run1 = compiler.newRun
             for unit <- suspendedUnits do unit.suspended = false
             run1.compileUnits(suspendedUnits)
-            finish(run1)
+            finish(run1)(using MacroClassLoader.init(ctx.fresh))
 
         finish(run)
       catch

tests/pos-macros/i9484/C.scala

@@ -0,0 +1,6 @@
+import scala.quoted._
+
+object C {
+  inline def m: Any = ${ mExpr }
+  def mExpr(using qctx: QuoteContext): Expr[Any] = Expr(1)
+}

tests/pos-macros/i9484/L.scala

@@ -0,0 +1,7 @@
+import scala.quoted._
+
+object L {
+  val m = C.m
+}
+
+class LC

tests/pos-macros/i9484/Q.scala

@@ -0,0 +1,6 @@
+import scala.quoted._
+
+object Q {
+  inline def f(): Any = ${ fExpr }
+  def fExpr(using QuoteContext): Expr[Any] = { new LC; Expr(1) }
+}

tests/pos-macros/i9484/Test.scala

@@ -0,0 +1,3 @@
+object Test extends App {
+  Q.f()
+}

tests/pos-macros/i9484b/C.scala

@@ -0,0 +1,6 @@
+import scala.quoted._
+
+object C {
+  inline def m: Any = ${ mExpr }
+  def mExpr(using qctx: QuoteContext): Expr[Any] = '{ () }
+}

tests/pos-macros/i9484b/Q.scala

@@ -0,0 +1,10 @@
+import scala.quoted._
+
+object Q {
+  inline def f(inline f: Any): Any = ${ Q2.fExpr('f) }
+}
+
+object Q2 {
+  val m = C.m
+  def fExpr(f: Expr[Any])(using QuoteContext): Expr[Any] = '{ () }
+}

tests/pos-macros/i9484b/Test.scala

@@ -0,0 +1,6 @@
+class TopLevelClass {
+  Q.f(1)
+}
+
+val a = 1
+val b = Q.f(a)