Fix default args remove double errors

Author: nicolasstucki

library/src/scala/annotation/newMain.scala

@@ -190,7 +190,7 @@ final class newMain extends MainAnnotation[FromString, Any]:
             if positionalArgs.length > 0 then
               List(positionalArgs.dequeue())
             else if paramInfo.hasDefault then
-              Nil
+              List("")
             else
               error(s"missing argument for ${paramInfo.name}")
               Nil

tests/run/main-annotation-help-override.check

@@ -11,7 +11,6 @@ Usage: helpOverride3 [-h] <Int>
 A method that should let --help display help, but not -h.
 Arguments:
   -h - Int
-Error: invalid argument for help: --help
 Error: missing argument for h
 Usage: helpOverride4 [--help] <Int> [-h] <Int>
 Error: invalid argument for notHelp: --help
@@ -21,7 +20,6 @@ Usage: helpOverride6 [--notHelp | -h] <Int>
 A method that should let --help display help, but not -h.
 Arguments:
   --notHelp (-h) - Int
-Error: invalid argument for notHelp: --help
 Error: missing argument for notH
 Usage: helpOverride7 [--notHelp | --help] <Int> [--notH | -h] <Int>
 Error: invalid argument for notHelp: --help
@@ -39,7 +37,6 @@ Arguments:
   --help - Int
 Error: invalid argument for h: -h
 Usage: helpOverride3 [-h] <Int>
-Error: invalid argument for help: -h
 Error: missing argument for h
 Usage: helpOverride4 [--help] <Int> [-h] <Int>
 Usage: helpOverride5 [--notHelp | --help] <Int>
@@ -49,7 +46,6 @@ Arguments:
   --notHelp (--help) - Int
 Error: invalid argument for notHelp: -h
 Usage: helpOverride6 [--notHelp | -h] <Int>
-Error: invalid argument for notHelp: -h
 Error: missing argument for notH
 Usage: helpOverride7 [--notHelp | --help] <Int> [--notH | -h] <Int>
 Error: invalid argument for notHelp: -h

tests/run/main-annotation-homemade-annot-1.scala

@@ -1,5 +1,5 @@
 import scala.concurrent._
-import scala.annotation.MainAnnotation
+import scala.annotation.*
 import scala.collection.mutable
 import ExecutionContext.Implicits.global
 import duration._

tests/run/main-annotation-wrong-param-1.check

@@ -1,13 +1,8 @@
-Error: invalid argument for inc: true
 Error: unused argument: SPAAAAACE
 Usage: add [--num] <Int> [--inc] <Int>
-Error: invalid argument for num: add
 Error: unused argument: 3
 Usage: add [--num] <Int> [--inc] <Int>
-Error: invalid argument for num: true
-Error: invalid argument for inc: false
 Error: unused argument: 10
 Usage: add [--num] <Int> [--inc] <Int>
-Error: invalid argument for num: binary
 Error: unused argument: 01
 Usage: add [--num] <Int> [--inc] <Int>

tests/run/main-annotation-wrong-param-names.check

@@ -3,7 +3,6 @@ Error: missing argument for inc
 Error: unknown argument name: --n
 Error: unknown argument name: --i
 Usage: add [--num] <Int> [--inc] <Int>
-Error: invalid argument for num: num
 Error: unused argument: inc
 Error: unused argument: 10
 Usage: add [--num] <Int> [--inc] <Int>