Stop flymake from breaking when major modes are invoked by mmm-mode, …

…at which point buffer-file-name is nil

init-ruby-mode.el

@@ -18,6 +18,15 @@
 (require 'flymake-ruby)
 (add-hook 'ruby-mode-hook 'flymake-ruby-load)
 
+;; Stop flymake from breaking when ruby-mode is invoked by mmm-mode,
+;; at which point buffer-file-name is nil
+(eval-after-load "flymake"
+  '(defun flymake-can-syntax-check-file (file-name)
+     "Determine whether we can syntax check FILE-NAME.
+Return nil if we cannot, non-nil if we can."
+     (if (and file-name (flymake-get-init-function file-name)) t nil)))
+
+
 
 ;;----------------------------------------------------------------------------
 ;; Ruby - Electric mode