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From Tuto0 Require Import Loader. (*** Printing messages ***) HelloWorld. Lemma test : True. Proof. hello_world. Abort. (*** Printing warnings ***) HelloWarning. Lemma test : True. Proof. hello_warning. Abort. (*** Signaling errors ***) Fail HelloError. Lemma test : True. Proof. Fail hello_error. Abort.