Hi, I narrowed it down to a "#define anything(" as the last line in the buffer will consistently lock up for me. I'm sure it's the c mode not resolving something right. I will experiment more and send you the results if I can reproduce with minimal buffer content. Thanks On Thu, Jan 24, 2019, 8:46 AM Eli Zaretskii > From: Michael Menefee > > Date: Wed, 23 Jan 2019 10:24:09 -0600 > > > > Editing a C header file, I type > > '#define AVL_iter(' and it locks up consistently and has to be killed > > from another terminal, with CPU at 100%. > > I cannot reproduce this. Does the buffer contain anything else in > addition to the text you've shown? Does it happen in "emacs -Q"? > > I invoked "emacs -Q", then typed > > C-x C-f headerhang.h > #define AVL_iter( > > At that point, Emacs was responsive as I'd expect. Are you doing the > same to reproduce the problem? > > Thanks. >