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type they provide an implementation for. This breaks code like: mod foo { struct Foo { ... } } impl foo::Foo { ... } Change this code to: mod foo { struct Foo { ... } impl Foo { ... } } Additionally, if you used the I/O path extension methods `stat`, `lstat`, `exists`, `is_file`, or `is_dir`, note that these methods have been moved to the the `std::io::fs::PathExtensions` trait. This breaks code like: fn is_it_there() -> bool { Path::new("/foo/bar/baz").exists() } Change this code to: use std::io::fs::PathExtensions; fn is_it_there() -> bool { Path::new("/foo/bar/baz").exists() } Closes #17059. RFC #155. [breaking-change]