Warn about forgotten string interpolators.

In the compiler sources this arrives with a number of false
positives, because we frequently work with strings containing
$foo where foo is an in-scope identifier. I think in normal
source code this will be less of a problem, or none at all;
but to be conservative the warning is born under -Xlint.

1 files changed, 15 insertions, 0 deletions

diff --git a/test/files/neg/forgot-interpolator.scala b/test/files/neg/forgot-interpolator.scala
new file mode 100644
index 0000000000..d67db82643
--- /dev/null
+++ b/test/files/neg/forgot-interpolator.scala
@@ -0,0 +1,15 @@
+class A {
+  val bippy = 123
+
+  def f = "Put the $bippy in the $bippy!" // warn
+}
+
+class B {
+  val dingus = 123
+
+  def f = "Put the $bippy in the $bippy!" // no warn
+}
+
+class C {
+  def f = """Put the ${println("bippy")} in the bippy!""" // warn
+}