auto merge of #14251 : alexcrichton/rust/hierarchy, r=huonw
This is an implementation of RFC 16. A module can now only be loaded if the module declaring `mod name;` "owns" the current directory. A module is considered as owning its directory if it meets one of the following criteria: * It is the top-level crate file * It is a `mod.rs` file * It was loaded via `#[path]` * It was loaded via `include!` * The module was declared via an inline `mod foo { ... }` statement For example, this directory structure is now invalid // lib.rs mod foo; // foo.rs mod bar; // bar.rs; fn bar() {} With this change `foo.rs` must be renamed to `foo/mod.rs`, and `bar.rs` must be renamed to `foo/bar.rs`. This makes it clear that `bar` is a submodule of `foo`, and can only be accessed through `foo`. RFC: 0016-module-file-system-hierarchy Closes #14180 [breaking-change]
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