Fix #7898: Handle annotation without symbols

Author: nicolasstucki

library/src/scala/tasty/reflect/SourceCodePrinter.scala

@@ -1228,7 +1228,7 @@ class SourceCodePrinter[R <: Reflection & Singleton](val tasty: R)(syntaxHighlig
 
     def printAnnotation(annot: Term)(given elideThis: Option[Symbol]): Buffer = {
       val Annotation(ref, args) = annot
-      if (annot.symbol.owner.fullName == "scala.internal.quoted.showName") this
+      if (annot.symbol.exists && annot.symbol.owner.fullName == "scala.internal.quoted.showName") this
       else {
         this += "@"
         printTypeTree(ref)

tests/run-macros/i7898.check

@@ -0,0 +1,4 @@
+scala.List.apply[scala.PartialFunction[scala.Int, scala.Predef.String]]((((x$1: scala.Int) => (x$1: @scala.unchecked) match {
+  case 1 =>
+    "x"
+}): scala.<repeated>[scala.PartialFunction[scala.Int, scala.Predef.String]]))

tests/run-macros/i7898/Macro_1.scala

@@ -0,0 +1,17 @@
+import quoted._
+object Main {
+
+  def myMacroImpl(body: Expr[_])(given qctx: QuoteContext): Expr[_] = {
+    import qctx.tasty.{_, given}
+    val bodyTerm = body.underlyingArgument.unseal
+    val showed = bodyTerm.show
+    '{
+      println(${Expr(showed)})
+      ${bodyTerm.seal}
+    }
+  }
+
+  inline def myMacro(body: => Any) <: Any = ${
+    myMacroImpl('body)
+  }
+}

tests/run-macros/i7898/Test_2.scala

@@ -0,0 +1,7 @@
+object Test {
+  def main(args: Array[String]) = {
+    val _ = Main.myMacro(List[PartialFunction[Int, String]] {
+      case 1 => "x"
+    })
+  }
+}