SI-8608 f-interpolator inlines StringOps

Instead of "hi".format(), emit new _root_.s.c.i.StringOps("hi").format(),
to clarify intent and avoid picking up some other implicit enhancement.

A further optimization would be to use String.format directly when
that is possible.  The ticket says it is not possible for
```
f"${BigDecimal(3.4)}%e"
```

1 files changed, 11 insertions, 3 deletions

diff --git a/src/compiler/scala/tools/reflect/FormatInterpolator.scala b/src/compiler/scala/tools/reflect/FormatInterpolator.scala
index 4fa06be60f..b445f1e2bb 100644
--- a/src/compiler/scala/tools/reflect/FormatInterpolator.scala
+++ b/src/compiler/scala/tools/reflect/FormatInterpolator.scala
@@ -182,15 +182,23 @@ abstract class FormatInterpolator {
       case (part, n) => copyPart(part, n)
     }
 
-    //q"{..$evals; ${fstring.toString}.format(..$ids)}"
+    //q"{..$evals; new StringOps(${fstring.toString}).format(..$ids)}"
     val format = fstring.toString
     if (ids.isEmpty && !format.contains("%")) Literal(Constant(format))
     else {
+      val scalaPackage = Select(Ident(nme.ROOTPKG), TermName("scala"))
+      val newStringOps = Select(
+        New(Select(Select(Select(scalaPackage,
+          TermName("collection")), TermName("immutable")), TypeName("StringOps"))),
+        termNames.CONSTRUCTOR
+      )
       val expr =
         Apply(
           Select(
-            Literal(Constant(format)),
-            newTermName("format")),
+            Apply(
+              newStringOps,
+              List(Literal(Constant(format)))),
+            TermName("format")),
           ids.toList
         )
       val p = c.macroApplication.pos