DOTR Crashes on @main

[abhsrivastava]

I installed dotty on my MacBook Pro. Version 0.20.0-RC1

I wrote the code below in a file called "Hello.scala"

@main def foo(s: String) : Unit =
  println(s"Hello $s")

DOTR crashes on Load of file

I am successfully able to compile this code using `dotc Hello.scala` and I can run this code using `dotr foo "Hello"` but when I try to load this file in the DOTR REPL by doing `:load Hello.scala`. The REPL throws a very nasty error and crashes.

Error

Exception in thread "main" scala.MatchError: PackageDef(Ident(<empty>),List(ValDef(rs$line$1,Ident(rs$line$1$),
Apply(Select(New(Ident(rs$line$1$)),<init>),List())), TypeDef(rs$line$1$,Template(DefDef(<init>,List(),List(List()),
TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Unit)],EmptyTree),List(Apply(Select(New(
TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class lang)),class Object)]),<init>),List()), Select(Select(
Ident(_root_),scala),Serializable)),ValDef(_,SingletonTypeTree(Ident(rs$line$1)),EmptyTree),List(Import(Ident(Console),
List(ImportSelector(Ident(_),EmptyTree,EmptyTree))),DefDef(foo,List(),List(List(ValDef(s,Ident(String),EmptyTree))),
Ident(Unit),Apply(Ident(println),List(Apply(Select(Apply(Select(Select(Select(Ident(_root_),scala),StringContext),apply),
List(Typed(SeqLiteral(List(Literal(Constant(hello )), Literal(Constant())),TypeTree[TypeRef(TermRef(
ThisType(TypeRef(NoPrefix,module class scala)),module Predef),type String)]),
TypeTree[AppliedType(TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class <repeated>),
List(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class scala)),module Predef),type String)))]))),s),
List(Typed(SeqLiteral(List(Ident(s)),TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Any)]),
TypeTree[AppliedType(TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class <repeated>),

List(TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Any)))]))))))))), TypeDef(foo,Template(DefDef(<init>,List(),List(List()),TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Unit)],EmptyTree),List(Apply(Select(New(TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class lang)),class Object)]),<init>),List())),ValDef(_,EmptyTree,EmptyTree),List(DefDef(main,List(),List(List(ValDef(args,TypeTree[AppliedType(TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Array),List(TypeRef(ThisType(TypeRef(NoPrefix,module class lang)),class String)))],EmptyTree))),TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Unit)],Try(Apply(Ident(foo),List(Apply(Apply(TypeApply(Ident(parseArgument),List(TypeTree[TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class scala)),module Predef),type String)])),List(Ident(args), Literal(Constant(0)))),List(Ident(given_FromString_String))))),List(CaseDef(Bind(error,Typed(Ident(_),TypeTree[TypeRef(ThisType(TypeRef(ThisType(TypeRef(NoPrefix,module class util)),module class CommandLineParser$)),class ParseError)])),EmptyTree,Apply(Ident(showError),List(Ident(error))))),EmptyTree))))))) (of class dotty.tools.dotc.ast.Trees$PackageDef)
    at dotty.tools.repl.CollectTopLevelImports.topLevelImports$1(CollectTopLevelImports.scala:23)
    at dotty.tools.repl.CollectTopLevelImports.run(CollectTopLevelImports.scala:28)
    at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:315)
    at scala.collection.immutable.List.map(List.scala:219)
    at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:316)
    at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:162)
    at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
    at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
    at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
    at dotty.tools.dotc.Run.runPhases$5(Run.scala:172)
    at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:180)
    at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
    at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:65)
    at dotty.tools.dotc.Run.compileUnits(Run.scala:187)
    at dotty.tools.dotc.Run.compileUnits(Run.scala:129)
    at dotty.tools.repl.ReplCompiler.runCompilationUnit(ReplCompiler.scala:156)
    at dotty.tools.repl.ReplCompiler.compile(ReplCompiler.scala:166)
    at dotty.tools.repl.ReplDriver.compile(ReplDriver.scala:227)
    at dotty.tools.repl.ReplDriver.interpret(ReplDriver.scala:193)
    at dotty.tools.repl.ReplDriver.run$$anonfun$1(ReplDriver.scala:136)
    at dotty.tools.repl.ReplDriver.withRedirectedOutput(ReplDriver.scala:148)
    at dotty.tools.repl.ReplDriver.run(ReplDriver.scala:137)
    at dotty.tools.repl.ReplDriver.interpretCommand(ReplDriver.scala:345)
    at dotty.tools.repl.ReplDriver.interpret(ReplDriver.scala:200)
    at dotty.tools.repl.ReplDriver.loop$1(ReplDriver.scala:127)
    at dotty.tools.repl.ReplDriver.runUntilQuit$$anonfun$1(ReplDriver.scala:130)
    at dotty.tools.repl.ReplDriver.withRedirectedOutput(ReplDriver.scala:148)
    at dotty.tools.repl.ReplDriver.runUntilQuit(ReplDriver.scala:130)
    at dotty.tools.repl.Main$.main(Main.scala:6)
    at dotty.tools.repl.Main.main(Main.scala)

[bishabosha]

Hi I believe the code snippet is missing a closing brace, thanks for updating the steps to reproduce

[abhsrivastava]

closing brace? scala 3 just needs indentation right.

[bishabosha]

Sorry, I mean parentheses to close println

[abhsrivastava]

Oh that I was a typo here when reporting the issue. I fixed it but the DOTR still crashes.