Add regression test

Author: nicolasstucki

tests/pos/quote-whitebox/Macro_1.scala

@@ -0,0 +1,10 @@
+
+import scala.quoted._
+
+object Macro {
+
+  inline def charOrString(inline str: String) <: Char | String = ${ impl(str) }
+
+  def impl(str: String) = if (str.length == 1) str.charAt(0).toExpr else str.toExpr
+
+}

tests/pos/quote-whitebox/Test_2.scala

@@ -0,0 +1,8 @@
+import Macro._
+
+object Test {
+
+  val x: Char = charOrString("1")
+  val y: String = charOrString("123")
+
+}