Why dereferencing enum causes move?

Code of error: 

match *self {
    // ...
}

I don"t quite know the difference between the two. Why does the former cause move or copy??

Rust-lang rust
Feb.28,2021

E0507

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1c0c7df-32ae8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1c0c7df-32ae8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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