Module blog::daily_rfcs::etc::_0063_module_file_system_hierarchy
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mod foo; can only be placed in a crate root and in mod.rs files.
Note
Valid mod foo;:
-
The file under parsing is the crate root, or
-
The file under parsing is a
mod.rs, or -
#[path]is specified, e.g.#[path = "foo.rs"] mod foo;.