Derive `Copy` for `VarianceDiagInfo`
Derive `Copy` for `VarianceDiagInfo`

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