I can't understand The code in the red area can run normally.
&a match EEE::Ad(p)
&a match &EEE::Ad(p)
c match Point
b match Point
The program output is as follows：
dddddd
cccccc
aaaaaa
bbbbbbb
Look at the warnings that come with the code. Point is a (capitalized) variable name here.
Regarding the EEE::Ad(…) case, that's a feature called "match ergonomics. It rewrites a pattern like EEE::Ad(p) matched against a reference into &EEE::Ad(ref p) instead of giving a compilation error, purely for programmer convenience (and to avoid the need for ref x patterns). There's a lint to disable (i. e. warn against) these, if you like.
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