Auto merge of #29800 - Detegr:master, r=nikomatsakis
Auto merge of #29800 - Detegr:master, r=nikomatsakis

Fundamental attribute was missing a feature gate test.

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