Fix for SI-6664, cycle in case classes.

Scope lookup of an overloaded symbol was accidentally
forcing some lazy info. Since as usual the caller didn't
even have any interest in the symbol, but only in whether
the name existed at all, I changed it call the method I
made for this exact purpose, containsName. Also I much
reduced the number of checks being made in the quest for
an inherited copy method.

1 files changed, 4 insertions, 0 deletions

diff --git a/test/files/pos/t6664.scala b/test/files/pos/t6664.scala
new file mode 100644
index 0000000000..7eb85f619d
--- /dev/null
+++ b/test/files/pos/t6664.scala
@@ -0,0 +1,4 @@
+final case class A(i: Int, s: String) {
+    protected def copy(s2: String): A = A(i, s2)
+    protected def copy(i2: Int): A = A(i2, s)
+}