From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Fri, 3 Nov 2017 12:33:13 +0000 (-0400)
Subject: * lisp/progmodes/flymake.el (flymake-start): Fix dead buffer case
X-Git-Tag: emacs-26.0.91~401
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=caa63cc96cfd2d21872eba17a474b4535178ad58;p=emacs.git

* lisp/progmodes/flymake.el (flymake-start): Fix dead buffer case

Don't try to flymake-start within a buffer that doesn't exist any more.
---

diff --git a/lisp/progmodes/flymake.el b/lisp/progmodes/flymake.el
index 1048bc50655..c2349d8c7cc 100644
--- a/lisp/progmodes/flymake.el
+++ b/lisp/progmodes/flymake.el
@@ -601,8 +601,8 @@ not expected."
           (null expected-token))
         ;; should never happen
         (flymake-error "Unexpected report from stopped backend %s" backend))
-       ((and (not (eq expected-token token))
-             (not force))
+       ((not (or (eq expected-token token)
+                 force))
         (flymake-error "Obsolete report from backend %s with explanation %s"
                        backend explanation))
        ((eq :panic report-action)
@@ -742,8 +742,11 @@ Interactively, with a prefix arg, FORCE is t."
           ()
           (remove-hook 'post-command-hook #'start-post-command
                        nil)
-          (with-current-buffer buffer
-            (flymake-start (remove 'post-command deferred) force)))
+          ;; The buffer may have disappeared already, e.g. because of
+          ;; code like `(with-temp-buffer (python-mode) ...)'.
+          (when (buffer-live-p buffer)
+            (with-current-buffer buffer
+              (flymake-start (remove 'post-command deferred) force))))
          (start-on-display
           ()
           (remove-hook 'window-configuration-change-hook #'start-on-display