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-# file name change
-
-change module system and `use` clauses.
-
-This means we would not change all possiable places for now.(I think this is hard to implement even in future.)
-
-## module system
-
-### physical module and logic module
-
-each file and folder(lib.rs in the folder) is a physical module.
-
-`use` and `pub` could import and export module as logic.
-
-logic module could be seen as `namespace`.
-
-Only logic module matters.
-
-### module tree
-
-only update the module which is included in the main branch.
-
-### module declaration
-
-> logic module could be defined in its ancestor's folder.
-
-> module
-
-## use clauses
-
-## NOTE
-
-1. path attribute
-if some module is declared by `#[path = "filePath"]`, only update the `filePath`.
-
-2. not update `mod.rs` change, like to `mod1.rs`
-
-3. for folder name change(not add more subfolders), equal to change its `mod.rs`.
-
-4. However, mod could be declared through `mod XX {}` in its ancestor file.
-
-5. Key: How to update? Through semantic tree, or plain text? I worry the former one is not that clever.