infix usage of matchers

[Lasering]

Under Scala 3 the usage of Matchers is severely hindered (when using the compiler flag -source future),by the error:

Alphanumeric method shouldBe is not declared `infix`; it should not be used as infix operator.
The operation can be rewritten automatically to `shouldBe` under -deprecation -rewrite.
Or rewrite to method syntax .shouldBe(...) manually.

Probably all methods in AnyShouldWrapper, and in ResultOf traits should be declared infix.

[bvenners]

@Lasering Do you have a compiler flag set perhaps that gets you that warning? Infix uses of methods not marked infix are not supposed to be deprecated until 3.1, not 3.0.

scala> import org.scalatest.matchers.should.Matchers._

scala> 42 shouldBe > (8)
val res0: org.scalatest.Assertion = Succeeded

So for now you could perhaps turn off that flag, if you have one. If not let us know here. Meanwhile we will add those infix modifiers.

Bill

[Lasering]

For those who want to compile code with scalacOptions: -Werror -source:future please add this option until this issue is resolved:

Test / scalacOptions += "-Wconf:msg=is not declared `infix`:s,msg=is declared 'open':s"

It also fixes the Unless class Any*Spec is declared 'open' errors.

[Lasering]

Scala 2.13.6 included a number of syntax changes were added to simplify cross-building between Scala 2 and 3. Especially (for this issue):

• Allow soft keywords open and infix under -Xsource:3
• Align leading infix operator with Scala 3 improvements

At least for Scala 2.13(.6) and Scala 3 the source can be the same, helping with the migration.

[cheeseng]

@Lasering We have added the open class for Any*Spec, I am not sure about the 2nd one 'Align leading infix operator with Scala 3 improvements', do you mind to clarify what we can do to improve this?

[Lasering]

@cheeseng I quoted the wrong line from the 2.13.6 release notes. The right one is:

Allow soft keywords open and infix under -Xsource:3 (scala/scala#9580)

This allows you to declare most of the matchers methods as infix, and thus solve the problem described in the opening post.

[Lasering]

Using scalatest 3.2.15 fixes this problem.