Rollup merge of #88830 - GuillaumeGomez:help-e0463, r=estebank
Rollup merge of #88830 - GuillaumeGomez:help-e0463, r=estebank

Add help for E0463

Fixes #87871.

r? ```@estebank```

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