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After upgrading to emacs 27 with

brew install emacs --HEAD

When starting elfeed with

C-x w

I get 

elfeed-db-load: Wrong type argument: avl-tree-, [cl-struct-avl-tree- [[[[[[[[[[[[[nil nil ... 0] [nil nil ... 0]\
 ... 0] [[nil nil ... 0] [nil nil ... 0] ... 0] ... 0] [[[nil nil ... 0] [nil nil ... 0] ... 0] [nil [nil nil ..\
. 0] ... 1] ... 0] ... 0] [[[[nil nil ... 0] nil ... -1] [[nil nil ... 0] [nil nil ... 0] ... 0] ... 0] [[[nil n\
il ... 0] [nil nil ... 0] ... 0] [[nil nil ... 0]
...   -1] nil nil 0] elfeed-db-compare]

Any ideas how to make elfeed work? This used to work in emacs 25

american-ninja-warrior
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  • I don't use elfeed, but usually incompatibilities in underlying data types and macros from version to version can be solved by recompiling the source. Have you tried reinstalling elfeed? – Basil Jan 24 '18 at 16:30

2 Answers2

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Just do this

rm ~/.emacs.d/elpa/elfeed-20180115.2112/*.elc

american-ninja-warrior
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It is problem with the elfeed-db after the emacs internals have changed in v. 26. See https://github.com/skeeto/elfeed/issues/207.

The database needs to be rebuild. I ran rm -rf ~/.elfeed/ and restarted emacs to purge memory.

Heikki
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