Merge pull request #12266 from dotty-staging/add-extra-regression-test-for-#12221

Add extra regression test for #12221

Author: liufengyun

tests/pos-macros/i12221/Macro_1.scala

@@ -0,0 +1,120 @@
+import scala.quoted.*
+import scala.reflect.*
+
+object Macros {
+
+    inline def show[A,B](inline expr: A => B): Unit =
+        ${printExpr('expr)}
+
+    def printExpr[A,B](expr: Expr[A=>B])(using Quotes) = '{
+        println(${showExpr3(expr)})
+    }
+
+    def showExpr3[A,B](expr: Expr[A=>B])(using Quotes): Expr[String] =
+        import quotes.reflect.*
+
+        val sb = new StringBuilder
+
+        // Makes us only print the body of thr function
+        def printDefFun(tree: Tree): Unit ={
+            val acc = new TreeAccumulator[Unit]{
+                def foldTree(s: Unit, tree: Tree)(owner: Symbol): Unit =
+                    tree match
+                        case deff : DefDef =>
+                            treePrint(deff.rhs.get, 0)
+                            sb.append("++++++++++++++++\n")
+                            sb.append(deff.rhs.get.show(using Printer.TreeStructure)).append('\n')
+                        case _ =>
+                            foldOverTree(s, tree)(owner)
+                }
+            acc.foldTree(List(), tree)(tree.symbol)
+        }
+
+        def treePrint(tree: Tree, level: Int): Unit = {
+            val pre = "   " * level
+            tree match {
+                case body : Term => {
+                    body match {
+                        // Normal typed
+                        case typed: Typed =>
+                            sb.append(pre + typed.getClass()).append('\n')
+                            sb.append(pre + s"Typed with ${typed.tpt}:\n")
+                            treePrint(typed.expr , level + 1)
+                        case Block(statements, expr) =>
+                            sb.append(pre + "Block:{").append('\n')
+                            statements.map(stat => stat match{
+                                case term: Term => treePrint(term, level + 1)
+                                case deff: Definition =>
+                                    sb.append(pre + "Definition statement\n")
+                                    treePrint(deff, level + 1)
+                                case _ =>
+                                    sb.append(pre + "Non-term statement\n")
+                                    sb.append(stat.show(using Printer.TreeStructure)).append('\n')
+                                })
+                            treePrint(expr, level + 1)
+                            sb.append(pre + "}\n")
+
+                        case Match(scrutinee, cases) =>
+                            sb.append(pre + "Match:\n")
+                            treePrint(scrutinee, level + 1)
+                            sb.append(pre + "with\n")
+                            cases.map(treePrint(_, level +1))
+
+                        case Ident(name) =>
+                            sb.append(pre + s"Identifier(${name})\n")
+
+                        case Apply(fun, args) =>
+                            sb.append(pre + "Apply\n")
+                            treePrint(fun, level + 1)
+                            if !args.isEmpty then
+                                sb.append(pre + "with arguments\n")
+                                args.zipWithIndex.map(
+                                    (arg, index) =>
+                                        treePrint(arg, level +1)
+                                        if args.size > 1 && index < args.size -1  then
+                                            // Used to seperate list of parameters
+                                            sb.append(pre + ",\n")
+                                    )
+                        case _ =>
+                            sb.append("Term\n")
+                            sb.append(tree.getClass()).append('\n')
+                            sb.append(tree.show(using Printer.TreeStructure)).append('\n')
+                    }
+                }
+
+                case CaseDef(pattern, guard, rhs) =>
+                    sb.append(pre + "caseDef:\n" )
+                    treePrint(pattern, level + 1)
+                    treePrint(rhs, level + 1)
+
+                //Adding this unappy makes the typed get swallowed
+                /*
+                case Unapply(fun, implicits, pattern) =>
+                    sb.append(pre + "Unapply with function").append('\n')
+                    treePrint(fun , level + 1)
+                    sb.append(pre + "with patterns").append('\n')
+                    pattern.map(treePrint(_ , level + 1))
+                */
+                case b: Bind => sb.append(pre + "Bind with stuff").append('\n')
+
+                case typed : Typed =>
+                        //sb.append(pre + typed.getClass()).append('\n')
+                        sb.append(pre + tree.getClass()).append('\n')
+                        sb.append(pre + s"Typed2 with ${typed.tpt}:").append('\n')
+                        treePrint(typed.expr , level + 1)
+
+                case Unapply(_,_,_) => sb.append(pre + "Unapply with stuff").append('\n')
+                case _ =>
+                    tree match
+                        case t: Term => sb.append("Term").append('\n')
+                        case _ => ()
+                    sb.append(tree.getClass()).append('\n')
+                    sb.append(tree.show(using Printer.TreeStructure)).append('\n')
+            }
+        }
+
+        val tree: Term = expr.asTerm
+        printDefFun(tree)
+        sb.append("Finished").append('\n')
+        Expr(sb.result())
+}

tests/pos-macros/i12221/Test_2.scala

@@ -0,0 +1,20 @@
+@main
+def hello: Unit = {
+    abstract class A
+    case class Foo(a: Int) extends A
+
+    //Will print the body of the given function, then its print (using Printer.TreeStructure)
+    Macros.show((x: A)=>{
+        x match {
+            case Foo(a) => a
+        }:Int
+    })
+    /*
+    val x = Foo(3)
+    Macros.show(
+        x match {
+            case Foo(1) => 3
+        }
+    )*/
+
+}