eval-buffer: Symbol’s function definition is void: treemacs-define-leaf-node

[erusyd]

Emacs version: 28.1 with native-compile
Linux Mint 20.3

[peterbecich]

It appears to be defined here

treemacs/src/elisp/treemacs-extensions.el

Lines 222 to 223 in 984099b

	(cl-defmacro treemacs-define-leaf-node (name icon &key ret-action tab-action mouse1-action visit-action)
	"Define a type of node that is a leaf and cannot be further expanded.

Recent commit made change to treemacs-extensions:

"The treemacs-extensions module is obsolete, treemacs-treelib should be used instead."

75ba10f

[peterbecich]

Probably duplicate: #988

[peterbecich]

I have solved it temporarily by adding

(require 'treemacs-extensions)

to init.el
emacs-lsp/lsp-metals#84 (comment)

[Alexander-Miller]

Probably duplicate: #988

Correct, it's a symptom of the same issue.

I have solved it temporarily by adding

That will probably not work. The extension api rewrite also included changing various functions elsewhere in the core of treemacs. New treemacs will probably break when trying to find or navigate between old extensions. Your best bet is using v2.11 until metals can update.