Incorrect warning when object contains multiple main methods

[scabug]

When an object contains multiple methods named main, including one with a valid type signature for the "true" main method, the compiler issues a warning indicating that the object contains no such method.

Here's an example:

object TooManyMains {                                                                                                                       
  def main(args: Array[String]): Unit = {                                                                                                   
    println("Hello, World!")                                                                                                                
  }                                                                                                                                         
  def main(a: Int, b: Int) = ???                                                                                                            
  def main(s: String, n: String) = ???                                                                                                      
}    

scalac mains.scala
mains.scala:1: warning: TooManyMains has a main method with parameter type Array[String], but TooManyMains will not be a runnable program.
  Reason: main method must have exact signature (Array[String])Unit
object TooManyMains {
       ^
one warning found

However it will will run successfully:

scala TooManyMains
Hello, World!

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-6896?orig=1
Reporter: @eengbrec
Affected Versions: 2.10.0-RC5
Attachments:

• mains.scala (created on Dec 30, 2012 9:48:03 PM UTC, 171 bytes)

[scabug]

@paulp said:
scala/scala#1835

[scabug]

@retronym said:
This was merged in 2.10.1