Unnecessary lifting of the receiver of a call to a method with varargs

[allanrenucci]

object Test {
  implicit class SCOps(ctx: StringContext) {
    def foo(args: String*): String = ""
  }

  def test(sc: StringContext, name: String) = {
    // {
    //   val $1$: Test.SCOps = Test.SCOps(sc)
    //   $1$.foo([ : String]: String*)
    // }
    sc.foo()

    // Test.SCOps(sc).foo([name : String]: String*)
    sc.foo(name)
  }
}

[allanrenucci]

Actually it happens not only for implicit conversions but every-time the receiver cannot be proven pure:

class Test {
  def foo(args: String*): String = ""

  def test = {
    def self = this
    // {
    //   val $1$: Test = self
    //   $1$.foo([ : String]: String*)
    // }
    self.foo()

    // self.foo(["Hello" : String]: String*)
    self.foo("Hello")
  }
}