Closed
Description
Minimized code
$ scalac -source xyz /tmp/scala-src/Foo.scala
Output
exception occurred while parsing /tmp/scala-src/Foo.scala
exception occurred while compiling /tmp/scala-src/Foo.scala
java.lang.IllegalArgumentException: enum case not found: xyz while compiling /tmp/scala-src/Foo.scala
Exception in thread "main" java.lang.IllegalArgumentException: enum case not found: xyz
at dotty.tools.dotc.config.SourceVersion$.valueOf(SourceVersion.scala:12)
at dotty.tools.dotc.config.Feature$.sourceVersionSetting(Feature.scala:77)
at dotty.tools.dotc.config.Feature$.sourceVersion(Feature.scala:83)
at dotty.tools.dotc.config.Feature$.migrateTo3(Feature.scala:85)
at dotty.tools.dotc.parsing.Scanners$Scanner.(Scanners.scala:165)
at dotty.tools.dotc.parsing.Parsers$Parser.(Parsers.scala:174)
at dotty.tools.dotc.typer.FrontEnd.parse$$anonfun$1(FrontEnd.scala:55)
at dotty.tools.dotc.typer.FrontEnd$$Lambda$9294/000000000000000000.apply$mcV$sp(Unknown Source)
at dotty.tools.dotc.typer.FrontEnd.monitor(FrontEnd.scala:43)
at dotty.tools.dotc.typer.FrontEnd.parse(FrontEnd.scala:67)
at dotty.tools.dotc.typer.FrontEnd.runOn$$anonfun$1(FrontEnd.scala:108)
at dotty.tools.dotc.typer.FrontEnd$$Lambda$9293/000000000000000000.applyVoid(Unknown Source)
at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
at scala.collection.immutable.List.foreach(List.scala:333)
at dotty.tools.dotc.typer.FrontEnd.runOn(FrontEnd.scala:108)
at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:185)
at dotty.tools.dotc.Run$$Lambda$9288/000000000000000000.applyVoid(Unknown Source)
at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
at dotty.tools.dotc.Run.runPhases$5(Run.scala:195)
at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:203)
at dotty.tools.dotc.Run$$Lambda$9251/000000000000000000.apply$mcV$sp(Unknown Source)
at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
at dotty.tools.dotc.Run.compileUnits(Run.scala:210)
at dotty.tools.dotc.Run.compileSources(Run.scala:147)
at dotty.tools.dotc.Run.compile(Run.scala:129)
at dotty.tools.dotc.Driver.doCompile(Driver.scala:38)
at dotty.tools.dotc.Driver.process(Driver.scala:193)
at dotty.tools.dotc.Driver.process(Driver.scala:162)
at dotty.tools.dotc.Driver.process(Driver.scala:174)
at dotty.tools.dotc.Driver.main(Driver.scala:201)
at dotty.tools.dotc.Main.main(Main.scala)
Expectation
If a scalac setting is defined as a ChoiceSetting e.g.
val source: Setting[String] = ChoiceSetting("-source", "source version", "source version", List("3.0", "3.1", "3.0-migration", "3.1-migration"), "3.0").withAbbreviation("--source")
but an argument out of the allow list is passed, scalac should exit immediately and display an error message instead of accepting an invalid option which will later cause an exception or, even worse, not fail explicitly at all but run compilation with wrong settings