Export of class fails with "constructor proxy ... cannot be used as a value"

[ellbur]

With Scala 3.0.0-M3

Minimized code

A minimal example consisting of the two source files below is on GitHub.

package.scala

package object foo {
  export foo.bar.Bar
}

Bar.scala

package foo.bar

class Bar

Output

$ sbt compile
[error] 3 |  export foo.bar.Bar
[error]   |         ^^^^^^^
[error]   |         constructor proxy object Bar cannot be used as a value

Expectation

Code should compile without errors.

[ellbur]

Tested that error is the same with 3536773 (current master).

[ellbur]

As a workaround, adding a dummy object prevents Scala from thinking you are referring to the constructor proxy:

Bar.scala

class Bar

object Bar

[bishabosha]

minimised to

package foo

object Wrap {
  export foo.Bar
}

class Bar

[odersky]

I believe we just need another condition on line 998 of Namer.scala

          else if (sym.isConstructor || sym.is(ModuleClass) || sym.is(Bridge)) SKIP

should be ... || sym.is(ConstructorProxy).