Explicitly specifying the type of self using the syntax `self: Box<Self>` is sort of vestigial. The feature of allowing `Box<Self>` as the type of `self`, along with the syntax for explicitly writing out the type of `self`, sort of slipped into 1.0 without anyone really considering the issue. The other syntax is strongly preferred.

[haaami01]

Explicitly specifying the type of self using the syntax self: Box<Self> is sort of vestigial. The feature of allowing Box<Self> as the type of self, along with the syntax for explicitly writing out the type of self, sort of slipped into 1.0 without anyone really considering the issue. The other syntax is strongly preferred.

The explicit type syntax will probably be deprecated at some point.

Originally posted by @eefriedman in #27941 (comment)

[jonas-schievink]

Looks like this was opened accidentally.