Scala3 -language compiler option issues #20083
Description
First discussed on Scala Contributors
Compiler version
All Scala3 versions v3.0.0 through v3.4.1
Minimized code
The -language compiler option does not behave as expected:
-
-language:helpdoes not provide available choices:% scala-cli compile -S 3.4.1 -O -language:help -- empty.scala(no available choices returned)
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-languagewith an incorrect choice does not fail compilation:% scala-cli compile -S 3.4.1 -O -language:WRONG -- empty.scala(no errors reported, the file compiles successfully)
Expectation
The behavior should look similar to Scala2 compilers, e.g.:
% scala-cli compile -S 2.13.13 -O -language:help -- empty.scala Enable or disable language features dynamics Allow direct or indirect subclasses of scala.Dynamic existentials Existential types (besides wildcard types) can be written and inferred higherKinds Allow higher-kinded types implicitConversions Allow definition of implicit functions called views postfixOps Allow postfix operator notation, such as `1 to 10 toList` (not recommended) reflectiveCalls Allow reflective access to members of structural types experimental.macros Allow macro definition (besides implementation and application) % scala-cli compile -S 2.13.13 -O -language:WRONG -- empty.scala scalac error: 'WRONG' is not a valid choice for '-language' scalac -help gives more information Compilation failed