Collect package imports in TreeMapWithImplicits

Fixes #11538

Author: nicolasstucki

compiler/src/dotty/tools/dotc/ast/TreeMapWithImplicits.scala

@@ -69,6 +69,12 @@ class TreeMapWithImplicits extends tpd.TreeMap {
     nestedCtx
   }
 
+  private def nestedPackageScopeCtx(tree: PackageDef)(using Context): Context =
+    tree.stats.foldLeft(ctx.withOwner(tree.symbol)) {
+      case (acc, stat: Import) => ctx.importContext(stat, stat.symbol)
+      case (acc, _) => acc
+    }
+
   private def patternScopeCtx(pattern: Tree)(using Context): Context = {
     val nestedCtx = ctx.fresh.setNewScope
     new TreeTraverser {
@@ -100,8 +106,10 @@ class TreeMapWithImplicits extends tpd.TreeMap {
         }
       case EmptyValDef =>
         tree
-      case _: PackageDef | _: MemberDef =>
-        super.transform(tree)(using localCtx)
+      case tree: PackageDef =>
+        super.transform(tree)(using nestedPackageScopeCtx(tree))
+      case _: MemberDef =>
+          super.transform(tree)(using localCtx)
       case impl @ Template(constr, parents, self, _) =>
         cpy.Template(tree)(
           transformSub(constr),

tests/pos/i11538a.scala

@@ -0,0 +1,23 @@
+package a:
+
+  trait Printer[A]:
+    def print(a: A): Unit
+
+  given Printer[String] with
+    def print(s: String) = println(s)
+
+package b:
+
+  import a.{given, *}
+
+  object test:
+    import scala.compiletime.{error, summonFrom}
+
+    inline def summonStringPrinter =
+      summonFrom {
+        case given Printer[String] => ()
+        case _ => error("Couldn't find a printer")
+      }
+
+    val summoned = summon[Printer[String]]
+    val summonedFrom = summonStringPrinter

tests/pos/i11538b.scala

@@ -0,0 +1,9 @@
+package a:
+  type Foo
+  given foo: Foo = ???
+
+import a.{Foo, given}
+object test:
+  inline def summonInlineFoo = scala.compiletime.summonInline[Foo]
+  val summoned = summon[Foo]
+  val summonedInline = summonInlineFoo