By default, use-package will attempts to catch and report errors that
occur during expansion of use-package declarations in your init file.
Customize the user option use-package-expand-minimally to a
non-nil value to disable this checking.
This behavior may be overridden locally using the :catch
keyword. If t or nil, it enables or disables catching
errors at load time. It can also be a function taking two arguments:
the keyword being processed at the time the error was encountered, and
the error object (as generated by condition-case). For
example:
(use-package example
;; Note that errors are never trapped in the preface, since
;; doing so would hide definitions from the byte-compiler.
:preface (message "I'm here at byte-compile and load time")
:init (message "I'm always here at startup")
:config
(message "I'm always here after the package is loaded")
(error "oops")
;; Don't try to (require 'example), this is just an example!
:no-require t
:catch (lambda (keyword err)
(message (error-message-string err))))
Evaluating the above form will print these messages:
I'm here at byte-compile and load time I'm always here at startup Configuring package example... I'm always here after the package is loaded oops