Use Ancestory to check default fn in const impl instead of comparing idents
Use Ancestory to check default fn in const impl instead of comparing idents

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