Not recursive

Author: jonhoo

src/dist/dist.rs

@@ -639,7 +639,8 @@ fn update_from_dist_<'a>(
 
                 // The user asked to update their nightly, but the latest nightly does not have all
                 // the components that the user currently has installed. Let's try the previous
-                // nightly (recursively) until we find a nightly that does.
+                // nightlies in reverse chronological order until we find a nightly that does,
+                // starting at one date earlier than the current manifest's date.
                 //
                 // NOTE: we don't need to explicitly check for the case where the next nightly to
                 // try is _older_ than the current nightly, since we know that the user's current