Switch to commit-specific nightlies

tests/compiletest/plugin/compile-fail/ban-domrefcell.rs

@@ -13,7 +13,7 @@ use script::test::Node;
 
 struct Foo {
     bar: DOMRefCell<JS<Node>>
-    //~^ ERROR Banned type DOMRefCell<JS<T>> detected. Use MutJS<JS<T>> instead,
+    //~^ ERROR Banned type DOMRefCell<JS<T>> detected. Use MutJS<JS<T>> instead
 }
 
 fn main() {}

tests/compiletest/plugin/compile-fail/ban.rs

@@ -12,7 +12,7 @@ use std::cell::Cell;
 
 struct Foo {
     bar: Cell<JSVal>
-    //~^ ERROR Banned type Cell<JSVal> detected. Use MutJS<JSVal> instead,
+    //~^ ERROR Banned type Cell<JSVal> detected. Use MutJS<JSVal> instead
 }
 
 fn main() {}

tests/compiletest/plugin/compile-fail/privatize.rs

@@ -8,7 +8,7 @@
 extern crate deny_public_fields;
 
 #[derive(DenyPublicFields)]
-//~^ ERROR custom derive attribute panicked
+//~^ ERROR proc-macro derive panicked
 struct Foo {
     pub v1: i32,
     v2: i32