WIP: Fix #11251

compiler/src/dotty/tools/dotc/typer/Inliner.scala

@@ -30,6 +30,7 @@ import collection.mutable
 import reporting.trace
 import util.Spans.Span
 import dotty.tools.dotc.transform.{Splicer, TreeMapWithStages}
+import quoted.QuoteUtils
 
 object Inliner {
   import tpd._
@@ -520,7 +521,7 @@ class Inliner(call: tpd.Tree, rhsToInline: tpd.Tree)(using Context) {
           ref(rhsClsSym.sourceModule)
         else
           inlineCallPrefix
-      val binding = ValDef(selfSym.asTerm, rhs).withSpan(selfSym.span).setDefTree
+      val binding = ValDef(selfSym.asTerm, QuoteUtils.changeOwnerOfTree(rhs, selfSym)).withSpan(selfSym.span).setDefTree
       bindingsBuf += binding
       inlining.println(i"proxy at $level: $selfSym = ${bindingsBuf.last}")
       lastSelf = selfSym

tests/pos-macros/i11251/Macro_1.scala

@@ -0,0 +1,29 @@
+package i11251
+
+import scala.quoted._
+
+class SL:
+
+  inline def foo(inline step: Int => Int): SL =
+     val f = step
+     this
+
+  def run1(): Unit = ???
+
+  inline def run(): Unit =
+    run1()
+
+// works
+//object SL
+
+object X:
+
+ inline def process[T](inline f:T) = ${
+   processImpl[T]('f)
+ }
+
+ def processImpl[T:Type](t:Expr[T])(using Quotes):Expr[T] = 
+   import quotes.reflect._
+   val checker = new TreeMap() {}
+   checker.transformTerm(t.asTerm)(Symbol.spliceOwner)
+   t

tests/pos-macros/i11251/Test_2.scala

@@ -0,0 +1,12 @@
+package i11251
+
+
+object Main {
+
+ def main(args:Array[String]):Unit =
+    val sl = new SL()
+    X.process(
+      sl.foo(x=>x+1).run()
+    )
+
+}