Merge pull request #9794 from dotty-staging/improve-inlined-node-printing

Improve Inlined printing

Author: liufengyun

compiler/src/dotty/tools/dotc/printing/RefinedPrinter.scala

@@ -463,7 +463,7 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
       case tree @ Inlined(call, bindings, body) =>
         (("/* inlined from " ~ (if (call.isEmpty) "outside" else toText(call)) ~ " */ ") `provided`
           !homogenizedView && ctx.settings.XprintInline.value) ~
-        blockText(bindings :+ body)
+          (if bindings.isEmpty then toText(body) else blockText(bindings :+ body))
       case tpt: untpd.DerivedTypeTree =>
         "<derived typetree watching " ~ tpt.watched.showSummary() ~ ">"
       case TypeTree() =>

tests/neg/cannot-reduce-inline-match.check

@@ -2,8 +2,6 @@
 9 |  foo("f") // error
   |  ^^^^^^^^
   |  cannot reduce inline match with
-  |   scrutinee:  {
-  |    "f"
-  |  } : ("f" : String)
+  |   scrutinee:  "f" : ("f" : String)
   |   patterns :  case _:Int
   | This location contains code that was inlined from cannot-reduce-inline-match.scala:3

tests/neg/inline-error-pos.check

@@ -2,8 +2,6 @@
 8 |  val b = foo(2) // error
   |          ^^^^^^
   |          cannot reduce inline match with
-  |           scrutinee:  {
-  |            2
-  |          } : (2 : Int)
+  |           scrutinee:  2 : (2 : Int)
   |           patterns :  case 1
   | This location contains code that was inlined from inline-error-pos.scala:3