Update the rust nightly to build cargo nightlies

Right now Cargo doesn't work on OSX 10.12, but the fix is in upstream rustc, so
let's pick that up and make Cargo nightlies compatible as well.

diff --git a/src/rustversion.txt b/src/rustversion.txt
index 1e81362f1ee2e0f0a4813db24da18564ce5462e2..8b6746a86088135d99339bcc5f4ff98320b8509d 100644 (file)
--- a/src/rustversion.txt
+++ b/src/rustversion.txt
@@ -1 +1 @@
-2016-07-04
+2016-07-12