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Backport "chore: filter allowed source versions by import and by settings" to 3.3 LTS #423

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Merged
merged 3 commits into from
May 27, 2025
Merged

Backport "chore: filter allowed source versions by import and by settings" to 3.3 LTS #423

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ab33bb1
chore: filter allowed source versions by import and by settings
hamzaremmal May 21, 2025
0ea554b
chore: filter allowed source versions by import and by settings
tgodzik May 26, 2025
2b859ac
chore: add `3.1-migration` in the compiler
hamzaremmal May 21, 2025
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12 changes: 10 additions & 2 deletions compiler/src/dotty/tools/dotc/config/SourceVersion.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,8 @@ import core.Decorators.*
import util.Property

enum SourceVersion:
case `3.0-migration`, `3.0`, `3.1` // Note: do not add `3.1-migration` here, 3.1 is the same language as 3.0.
case `3.0-migration`, `3.0`
case `3.1-migration`, `3.1`
case `3.2-migration`, `3.2`
case `3.3-migration`, `3.3`
case `future-migration`, `future`
Expand All @@ -21,10 +22,17 @@ enum SourceVersion:
def isAtMost(v: SourceVersion) = stable.ordinal <= v.ordinal

object SourceVersion extends Property.Key[SourceVersion]:

def defaultSourceVersion = `3.3`

/* Illegal source versions that may not appear in the settings `-source:<...>` */
val illegalInSettings = List(`3.1-migration`, `never`)

/* Illegal source versions that may not appear as an import `import scala.language.<...>` */
val illegalInImports = List(`3.1-migration`, `never`)

/** language versions that may appear in a language import, are deprecated, but not removed from the standard library. */
val illegalSourceVersionNames = List("3.1-migration").map(_.toTermName)
val illegalSourceVersionNames = "3.1-migration" :: illegalInImports.map(_.toString.toTermName)

/** language versions that the compiler recognises. */
val validSourceVersionNames = values.toList.map(_.toString.toTermName)
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7 changes: 7 additions & 0 deletions compiler/test/dotty/tools/dotc/config/ScalaSettingsTests.scala
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Expand Up @@ -199,4 +199,11 @@ class ScalaSettingsTests:
)
assertEquals(result, Right(reporting.Action.Error))

@Test def `illegal source versions are not accepted when parsing the settings`: Unit =
for source <- SourceVersion.illegalInSettings do
val settings = ScalaSettings
val result = settings.processArguments(List("-source", source.toString()), true)
assertEquals(0, result.warnings.length)
assertEquals(1, result.errors.length)

end ScalaSettingsTests