borrowing_exerci 0.4.51

how to understand the borrowing in rust
Documentation 
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name: borrowing_exerci
version: "0.2.52"
about: How to understand the rust borrowing.
author: Gudao Luo <gudao.luo@gmail.com>

settings:
    - ArgRequiredElseHelp

args:
    # cargo run --bin bw -- --help
    - feature:
        short: f
        long: feature
        # help: 
        # possible_values can also be defined in this list format
        possible_values: [ ok, cp, okay, okey, 
            err_01, err_02, err_03, err_04, err_05,
            err_06, err_07, err_08, err_09, err_10,]
        takes_value: true
    - code:
        # help: 
        index: 1
        # A list of possible values can be defined as a list
        possible_values:
            ## BEGIN for insider
            # relation file: features.rs
            #- allx  # allgemeine information commands
            #- user  # information commands for user
            #- bwx   # bin for information commands
            ## END for insider
            ##example_name
            - string_type_string_str
            - mut_var_sized_struct_ref
            - mut_var_sized_string_refs
            - mut_var_sized_string_ref
            - mut_immut_ref_str
            - mut_immut_mut_string
            - mut_fn_double_refs
            - mut_fn_base_string
            - mut_fn_base_str
            - mut_base_mut_count
            - kw_fn_vec_u8
            - kw_fn_vec_str
            - for_loop_for_vec_iter
            - for_loop_for_vec
            - for_loop_for_next
            - for_loop_for_iter_mut
            - for_loop_for_into_iter
            - for_loop_for_enumerate
            - for_loop_for_arr
            - expand_struct_u8
            - expand_struct_string
            - expand_struct_str
            - dbg_mut_macro
            - closure_mut_move
            - closure_move_vec
            - closure_kw_move
            - closure_immut_string
    - flag:
        help: add the follow ARGS `code` hinter the flag, like `-c kw_fn_vec_u8`
        short: c
        long: code
        multiple: true
        global: true
        requires:
            - code