SI-9104 Autodetect raw pastage

If `-raw` is not supplied explicitly to REPL `:paste`,
see if the code text starts with `package` keyword or
else see if it parses to a named package (to cope with
leading commentary). In that case, take it as raw.

But parse only on suspect comment slash.

It's only worth parsing for a package if there's a chance
that package keyword is buried behind comments.

Small refactors to the `paste` object.

1 files changed, 14 insertions, 0 deletions

diff --git a/test/files/run/repl-paste-b.check b/test/files/run/repl-paste-b.check
new file mode 100644
index 0000000000..2e205d48d6
--- /dev/null
+++ b/test/files/run/repl-paste-b.check
@@ -0,0 +1,14 @@
+
+scala> :paste < EOF
+// Entering paste mode (EOF to finish)
+
+object X
+EOF
+
+// Exiting paste mode, now interpreting.
+
+defined object X
+
+scala> assert(X.getClass.getName.contains("line"))
+
+scala> :quit