It seems like I missed this one when reviewing #51895: https://github.com/rust-lang/rust/blob/c6807bb1b282e0c5398aa4e659dbc165b6f3c81b/src/test/ui/chalkify/lower_env1.stderr#L7-L8 (same duplicate just below in that same file) I'm just opening this issue for reference, I'll take some time to investigate later. cc @nikomatsakis if it's still there when you get back, cc @tmandry