SI-8843 AbsFileCL acts like a CL

Let the AbstractFileClassLoader override just the usual suspects.

Normal delegation behavior should ensue.

That's instead of overriding `getResourceAsStream`, which was intended
that "The repl classloader now works more like you'd expect a classloader to."
(Workaround for "Don't know how to construct an URL for something which exists
only in memory.")

Also override `findResources` so that `getResources` does the obvious thing,
namely, return one iff `getResource` does.

The translating class loader for REPL only special-cases `foo.class`: as
a fallback, take `foo` as `$line42.$read$something$foo` and try that class file.
That's the use case for "works like you'd expect it to."

There was a previous fix to ensure `getResource` doesn't take a class name.
The convenience behavior, that `classBytes` takes either a class name or a resource
path ending in ".class", has been promoted to `ScalaClassLoader`.

1 files changed, 33 insertions, 0 deletions

diff --git a/test/files/run/t8843-repl-xlat.scala b/test/files/run/t8843-repl-xlat.scala
new file mode 100644
index 0000000000..6426dbe7d4
--- /dev/null
+++ b/test/files/run/t8843-repl-xlat.scala
@@ -0,0 +1,33 @@
+
+import scala.tools.partest.SessionTest
+
+// Handy hamburger helper for repl resources
+object Test extends SessionTest {
+  def session =
+"""Type in expressions to have them evaluated.
+Type :help for more information.
+
+scala> $intp.isettings.unwrapStrings = false
+$intp.isettings.unwrapStrings: Boolean = false
+
+scala> class Bippy
+defined class Bippy
+
+scala> $intp.classLoader getResource "Bippy.class"
+res0: java.net.URL = memory:(memory)/$line4/$read$$iw$$iw$Bippy.class
+
+scala> ($intp.classLoader getResources "Bippy.class").nextElement
+res1: java.net.URL = memory:(memory)/$line4/$read$$iw$$iw$Bippy.class
+
+scala> ($intp.classLoader classBytes "Bippy").nonEmpty
+res2: Boolean = true
+
+scala> ($intp.classLoader classAsStream "Bippy") != null
+res3: Boolean = true
+
+scala> $intp.classLoader getResource "Bippy"
+res4: java.net.URL = null
+
+scala> :quit"""
+}
+