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Re:Emacs 26 Brings Generators and Threads by gkya on Friday June 01, 2018 @12:24PM (#17206945)
It's C-u <Space> in Emacs lingo; it pops the mark ring. Some actions like C-<Space>, M-< and M-> push the position of the point to the mark ring before moving it, and when you pop the mark ring, you jump to the position that was pushed most recently.
Re:Emacs 26 Brings Generators and Threads by jackewiehose on Friday June 01, 2018 @01:07PM (#17207496)
> Some actions [...] push the position of the point to the mark ring before moving it

Notably C-s and C-r (incremental search forward/backward). That in combination with C-space is the way to navigate in emacs like a pro :-)

(btw: its C-u C-space. C-u space inserts 4 whitespace)

Re:Emacs 26 Brings Generators and Threads by gkya on Friday June 01, 2018 @05:45PM (#17210687)
TIL! I didn't know search pushed marks, thanks!