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  • Pierre Rouleau thinks this is interesting:

C-s C-y

isearch-yank-line

Start an incremental search with the text from the cursor position to the end of the line as the search string.

From

Cover of Learning GNU Emacs, 3rd Edition

Note

It seems that since Emacs 24.1 C-s C-y is bound to isearch-yank-kill, not to isearch-yank-line.