Initial import of itertools-0.9.0.

Bug: 155309706
Change-Id: Id790c146e836f0eadfb0d8a103cbe2d226a598c3
diff --git a/.rustfmt.toml b/.rustfmt.toml
new file mode 100644
index 0000000..06eb57a
--- /dev/null
+++ b/.rustfmt.toml
@@ -0,0 +1,3 @@
+# Temporarily disable rustfmt completely to avoid conflicts of newly formatted
+# code with old PRs.
+ignore = ["/"]