SI-7470 implements fundep materialization

This fix provides implicit macros with an ability to affect type inference
in a more or less sane manner. That's crucial for materialization of
multi-parametric type class instances (e.g. Iso's from shapeless).
Details of the technique can be found in comments.

1 files changed, 12 insertions, 0 deletions

diff --git a/test/files/run/t5923c/Test_2.scala b/test/files/run/t5923c/Test_2.scala
new file mode 100644
index 0000000000..a00f4ed7db
--- /dev/null
+++ b/test/files/run/t5923c/Test_2.scala
@@ -0,0 +1,12 @@
+// see the comments for macroExpandApply.onDelayed for an explanation of what's tested here
+object Test extends App {
+  case class Foo(i: Int, s: String, b: Boolean)
+  def foo[C, L](c: C)(implicit iso: Iso[C, L]): L = iso.to(c)
+
+  {
+    val equiv = foo(Foo(23, "foo", true))
+    def typed[T](t: => T) {}
+    typed[(Int, String, Boolean)](equiv)
+    println(equiv)
+  }
+}
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