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| (defun error-ignorable-require (md) | |
| (condition-case err | |
| (require md) | |
| (error nil))) | |
| (defmacro when-mode (modename &rest body) | |
| "Evaluate body when `modename' is require-d successfully. `modename' should not be quoted." | |
| (let | |
| ((mode `',modename)) | |
| `(when | |
| (error-ignorable-require ,mode) | |
| ,@body))) |
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