t7848-interp-warn.scala:18: warning: possible missing interpolator: detected interpolated identifier `$foo`
    "An important $foo message!"                              // warn on ident in scope
    ^
t7848-interp-warn.scala:22: warning: possible missing interpolator: detected an interpolated expression
    "A doubly important ${foo * 2} message!"                  // warn on some expr, see below
    ^
t7848-interp-warn.scala:25: warning: possible missing interpolator: detected interpolated identifier `$bar`
  def i = s"Try using '${ "$bar" }' instead."                 // was: no warn on space test
                          ^
t7848-interp-warn.scala:26: warning: possible missing interpolator: detected interpolated identifier `$bar`
  def j = s"Try using '${ "something like $bar" }' instead."  // warn
                          ^
t7848-interp-warn.scala:32: warning: possible missing interpolator: detected an interpolated expression
  def v = "${baz}${bar}"                                      // warn on second expr
          ^
t7848-interp-warn.scala:33: warning: possible missing interpolator: detected an interpolated expression
  def w = "${ op_* }"                                         // warn, only cheap ident parsing
          ^
t7848-interp-warn.scala:34: warning: possible missing interpolator: detected an interpolated expression
  def x = "${ bar }"                                          // warn, a cheap ident in scope
          ^
t7848-interp-warn.scala:36: warning: possible missing interpolator: detected an interpolated expression
  def z = "${ baz * 3}"                                       // warn, no expr parsing
          ^
error: No warnings can be incurred under -Xfatal-warnings.
8 warnings found
one error found