-source choices passed to scalac 3.* via space instead of colon and gets ignored.

[seigert]

scalac respects -source option choices only if they are passed via colon to it: -source:future, -source:future-migration, etc.

As far as I could understand, sbt-tpolecat passes all options along with arguments to scalac as one big List[String] turn lead to ignore or such options.

Could be shown with this scala-cli scripts:

1. Working one:

   //> using scala "3.2.1"
   //> using option "-source:future"
   
   def method[A: Numeric](a: A): A => A = { a1 =>
     implicitly[Numeric[A]].plus(a, a1)
   }
   
   println(s"method(1)(1) = ${method(1)(1)}")

2. Incorrect:

   //> using scala "3.2.1"
   //> using option "-source future"
   
   def method[A: Numeric](a: A): A => A = { a1 =>
     implicitly[Numeric[A]].plus(a, a1)
   }
   
   println(s"method(1)(1) = ${method(1)(1)}")

   Compilation fails with:

   Compiling project (Scala 3.2.1, JVM)
   Warning: bad option '-source future' was ignored
   [error] ./space.sc:9:38
   [error] Found:    (1 : Int)
   [error] Required: Numeric[Int]
   [error] println(s"method(1)(1) = ${method(1)(1)}")
   [error]                                      ^
   Error compiling project (Scala 3.2.1, JVM)
   Compilation failed

P.S. the same could be said about -Ykind-projector:underscores and other : options.

[DavidGregory084]

Hmm...that's frustrating. I wonder when this changed?

In fact, Scala 3.x's own compilation tests provide these as space-separated tokens.