Rollup merge of #69847 - GuillaumeGomez:cleanup-e0393, r=Dylan-DPC
Rollup merge of #69847 - GuillaumeGomez:cleanup-e0393, r=Dylan-DPC

clean up E0393 explanation

r? @Dylan-DPC

aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust