Unable to disable string interpolation

[olafurpg]

Originally reported in scalacenter/scalafix#803

I want to disable the default string interpolation.

metap tells me that it is this symbol

[52:20..52:21) => scala/StringContext#s().

but this rule fails to work in either Disable.symbols or Disable.ifSynthetic

  {
    symbol = "scala/StringContext#s()."
    message = "use the safe `z`, `cord` and `str` interpolators"
  }