Adds a margin stripping string interpolator.

Currently only for compiler internal use.

Designed to avoid surprises if the interpolated values
themselves contain the margin delimiter.

Before:

    val bip = "\n  |.."

     s"""fooo
        |bar $bip
        |baz""".stripMargin

    "fooo
    bar
    ..
    baz"

After:

    sm"""fooo
        |bar $bip
        |baz"""

    "fooo
    bar
      |..
    baz"

1 files changed, 41 insertions, 0 deletions

diff --git a/test/files/run/sm-interpolator.scala b/test/files/run/sm-interpolator.scala
new file mode 100644
index 0000000000..7f7b9f061a
--- /dev/null
+++ b/test/files/run/sm-interpolator.scala
@@ -0,0 +1,41 @@
+object Test extends App {
+  import scala.reflect.internal.util.StringContextStripMarginOps
+  def check(actual: Any, expected: Any) = if (actual != expected) sys.error(s"expected: [$expected], actual: [$actual])")
+
+  val bar = "|\n ||"
+
+  check(
+    sm"""|ab  
+         |de
+         |${bar} | ${1}""",
+      "ab  \nde\n|\n || | 1")
+
+  check(
+    sm"|",
+      "")
+
+  check(
+    sm"${0}",
+      "0")
+
+  check(
+    sm"${0}",
+    "0")
+
+  check(
+    sm"""${0}|${1}
+     |""",
+      "0|1\n")
+
+  check(
+    sm"""   ||""",
+      "|")
+
+  check(
+    sm""" ${" "} ||""",
+      "   ||")
+
+  check(
+      sm"\n",
+     raw"\n".stripMargin)
+}