> match_df(my_data_frame, corr, warn = TRUE)
Message: 

Message: -- Warnings were found in the following columns --

Message: 

Message: ● raboof

Message:   1. ! Duplicate keys were found in the `from` column of `corr`: "foubar",
    "foobr", "fubar", ".missing", "unknown" only the first instance will be
    used.

Message:   2. ! 'a', 'b', 'c', 'd', 'e', 'fumar' were changed to the default value
    ('check data')

Message: ● treatment

Message:   1. ! Duplicate keys were found in the `from` column of `corr`: "Yes", "Y",
    "No", "N", ".missing" only the first instance will be used.

Message:   2. ! 'a', 'b', 'c', 'd', 'e' were changed to the default value ('check
    data')

       raboof  treatment      region
1  check data check data     Alabama
2  check data check data      Alaska
3  check data check data     Arizona
4  check data check data    Arkansas
5  check data check data  California
6      foobar        yes    Colorado
7      foobar        yes Connecticut
8      foobar         no    Delaware
9     missing    missing     Florida
10    missing         no     Georgia
11 check data        yes      Hawaii

