Fix #5997: Add missing parentheses

compiler/test/dotc/pos-recompilation.whitelist

@@ -300,6 +300,7 @@ i4819
 i4984
 i4999
 i5090
+i5997
 i518
 i5188
 i523

library/src/scala/tasty/reflect/Printers.scala

@@ -758,7 +758,7 @@ trait Printers
           printType(tree.tpe)
 
         case Term.Select(qual, name) =>
-          printTree(qual)
+          printQualTree(qual)
           if (name != "<init>" && name != "package")
             this += "." += name
           this
@@ -809,7 +809,7 @@ trait Printers
         case Term.Apply(fn, args) =>
           fn match {
             case Term.Select(Term.This(_), "<init>") => this += "this" // call to constructor inside a constructor
-            case _ => printTree(fn)
+            case _ => printQualTree(fn)
           }
           val args1 = args match {
             case init :+ Term.Typed(Term.Repeated(Nil, _), _) => init // drop empty var args at the end
@@ -819,7 +819,7 @@ trait Printers
           inParens(printTrees(args1, ", "))
 
         case Term.TypeApply(fn, args) =>
-          printTree(fn)
+          printQualTree(fn)
           fn match {
             case Term.Select(Term.New(TypeTree.Applied(_, _)), "<init>") =>
               // type bounds already printed in `fn`
@@ -894,7 +894,7 @@ trait Printers
           printTree(elsep)
 
         case Term.Match(selector, cases) =>
-          printTree(selector)
+          printQualTree(selector)
           this += highlightKeyword(" match", color)
           inBlock(printCases(cases, lineBreak()))
 
@@ -941,6 +941,14 @@ trait Printers
 
       }
 
+      def printQualTree(tree: Tree): Buffer = tree match {
+        case Term.IsIf(_) | Term.IsMatch(_) | Term.IsWhile(_) | Term.IsTry(_) | Term.IsReturn(_) =>
+          this += "("
+          printTree(tree)
+          this += ")"
+        case _ => printTree(tree)
+      }
+
       def flatBlock(stats: List[Statement], expr: Term): (List[Statement], Term) = {
         val flatStats = List.newBuilder[Statement]
         def extractFlatStats(stat: Statement): Unit = stat match {

tests/pos/i5997.decompiled

@@ -0,0 +1,16 @@
+class Test() {
+  val v1: scala.Option[scala.Int] = (if (true) scala.Some.apply[scala.Int](1) else scala.None).map[scala.Int](((v: scala.Int) => v.+(1)))
+  val v2: scala.Option[scala.Int] = (try scala.Some.apply[scala.Int](1) finally ()).map[scala.Int](((v: scala.Int) => v.+(1)))
+  val v3: scala.Option[scala.Int] = (1 match {
+    case _ =>
+      scala.Some.apply[scala.Int](1)
+  }).map[scala.Int](((v: scala.Int) => v.+(1)))
+  val v4: java.lang.String = (while (true) ()).toString()
+  def v5: scala.Option[scala.Predef.String] = scala.Some.apply[java.lang.String]((return scala.Some.apply[java.lang.String]("a")).toString())
+  def foo(x: scala.Boolean): scala.Boolean = x.unary_!
+  def bar(): scala.Int = (if (true) 1 else 2) match {
+    case x =>
+      (x: scala.Int)
+  }
+  def baz(): scala.Any = (if (true) ((x: scala.Any) => scala.Predef.identity[scala.Any](x)) else ((x: scala.Any) => scala.Predef.identity[scala.Any](x))).apply(0)
+}

tests/pos/i5997.scala

@@ -0,0 +1,10 @@
+class Test {
+  val v1 = (if true then Some(1) else None).map(v => v+1)
+  val v2 = (try Some(1) finally {}).map(v => v+1)
+  val v3 = (1 match { case _ => Some(1) }).map(v => v+1)
+  val v4 = (while (true) ()).toString
+  def v5: Option[String] = Some((return Some("a")).toString)
+  def foo(x: Boolean) = !x
+  def bar() = (if true then 1 else 2) match { case x => x }
+  def baz() = (if true then identity else identity)(0)
+}

tests/run-with-compiler/i5997.check

@@ -0,0 +1 @@
+(if (true) scala.Some.apply[scala.Int](1) else scala.None).map[scala.Int](((v: scala.Int) => v.+(1)))

tests/run-with-compiler/i5997.scala

@@ -0,0 +1,7 @@
+object Test {
+  def main(args: Array[String]): Unit = {
+    import quoted.Toolbox.Default._
+    val v = '{ (if true then Some(1) else None).map(v => v+1) }
+    println(v.show)
+  }
+}