Merge pull request #14809 from dotty-staging/fix-14789

Handle SummonFrom in reflect TreeAccumulator

library/src/scala/quoted/Quotes.scala

@@ -4621,6 +4621,8 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
           case Bind(_, body) => foldTree(x, body)(owner)
           case Unapply(fun, implicits, patterns) => foldTrees(foldTrees(foldTree(x, fun)(owner), implicits)(owner), patterns)(owner)
           case Alternatives(patterns) => foldTrees(x, patterns)(owner)
+          case SummonFrom(cases) => foldTrees(x, cases)(owner)
+          case _ => throw MatchError(tree.show(using Printer.TreeStructure))
         }
       }
     end TreeAccumulator
@@ -4662,7 +4664,7 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
       def transformTree(tree: Tree)(owner: Symbol): Tree = {
         tree match {
           case tree: PackageClause =>
-            PackageClause.copy(tree)(transformTerm(tree.pid).asInstanceOf[Ref], transformTrees(tree.stats)(tree.symbol))
+            PackageClause.copy(tree)(transformTerm(tree.pid)(owner).asInstanceOf[Ref], transformTrees(tree.stats)(tree.symbol))
           case tree: Import =>
             Import.copy(tree)(transformTerm(tree.expr)(owner), tree.selectors)
           case tree: Export =>
@@ -4685,6 +4687,8 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
             Alternatives.copy(pattern)(transformTrees(pattern.patterns)(owner))
           case TypedOrTest(inner, tpt) =>
             TypedOrTest.copy(tree)(transformTree(inner)(owner), transformTypeTree(tpt)(owner))
+          case _ =>
+            throw MatchError(tree.show(using Printer.TreeStructure))
         }
       }
 
@@ -4708,11 +4712,20 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
             val owner = tree.symbol
             TypeDef.copy(tree)(tree.name, transformTree(tree.rhs)(owner))
           case tree: ClassDef =>
-            ClassDef.copy(tree)(tree.name, tree.constructor, tree.parents, tree.self, tree.body)
+            val constructor @ DefDef(_, _, _, _) = transformStatement(tree.constructor)(tree.symbol)
+            val parents = tree.parents.map(transformTree(_)(tree.symbol))
+            val self = tree.self.map { slf =>
+              transformStatement(slf)(tree.symbol) match
+                case self: ValDef => self
+            }
+            val body = tree.body.map(transformStatement(_)(tree.symbol))
+            ClassDef.copy(tree)(tree.name, constructor, parents, self, body)
           case tree: Import =>
             Import.copy(tree)(transformTerm(tree.expr)(owner), tree.selectors)
           case tree: Export =>
             tree
+          case _ =>
+            throw MatchError(tree.show(using Printer.TreeStructure))
         }
       }
 
@@ -4758,6 +4771,10 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
             Repeated.copy(tree)(transformTerms(elems)(owner), transformTypeTree(elemtpt)(owner))
           case Inlined(call, bindings, expansion) =>
             Inlined.copy(tree)(call, transformSubTrees(bindings)(owner), transformTerm(expansion)(owner))
+          case SummonFrom(cases) =>
+            SummonFrom.copy(tree)(transformCaseDefs(cases)(owner))
+          case _ =>
+            throw MatchError(tree.show(using Printer.TreeStructure))
         }
       }
 
@@ -4786,6 +4803,8 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
           TypeBind.copy(tree)(tree.name, tree.body)
         case tree: TypeBlock =>
           TypeBlock.copy(tree)(tree.aliases, tree.tpt)
+        case _ =>
+          throw MatchError(tree.show(using Printer.TreeStructure))
       }
 
       def transformCaseDef(tree: CaseDef)(owner: Symbol): CaseDef = {

tests/run-custom-args/tasty-inspector/i14789.scala

@@ -0,0 +1,45 @@
+import scala.quoted.*
+import scala.tasty.inspector.*
+
+@main def Test = {
+  // Artefact of the current test infrastructure
+  // TODO improve infrastructure to avoid needing this code on each test
+  val classpath = dotty.tools.dotc.util.ClasspathFromClassloader(this.getClass.getClassLoader).split(java.io.File.pathSeparator).find(_.contains("runWithCompiler")).get
+  val allTastyFiles = dotty.tools.io.Path(classpath).walkFilter(_.extension == "tasty").map(_.toString).toList
+  val tastyFiles = allTastyFiles.filter(_.contains("App"))
+
+  // in dotty-example-project
+  val inspector = new Inspector {
+    def inspect(using Quotes)(tastys: List[Tasty[quotes.type]]): Unit = {
+      import quotes.reflect.*
+      val traverser = new TreeTraverser {
+        override def traverseTree(tree: Tree)(owner: Symbol): Unit = {
+          try {
+            super.traverseTree(tree)(owner)
+          } catch {
+            case e =>
+              report.error(s"unexpected error ${e}", tree.pos)
+              throw e
+          }
+        }
+      }
+      val mapper = new TreeMap { }
+      tastys.foreach{ tasty =>
+        traverser.traverseTree(tasty.ast)(tasty.ast.symbol)
+        mapper.transformTree(tasty.ast)(tasty.ast.symbol)
+      }
+    }
+  }
+  TastyInspector.inspectTastyFiles(tastyFiles)(inspector)
+}
+
+object App {
+  import scala.compiletime.*
+
+  transparent inline def summonFirst0[T]: Any =
+    inline erasedValue[T] match
+      case _: (a *: b) => summonFrom {
+        case instance: `a` => instance
+        case _ => summonFirst0[b]
+      }
+}