No more anonymous trait parameters
In accordance with RFC #1685, parameters in trait method declarations are no longer allowed to be anonymous.
For example, in the 2015 edition, this was allowed:
# #![allow(unused_variables)] #fn main() { trait Foo { fn foo(&self, u8); } #}
In the 2018 edition, all parameters must be given an argument name (even if it's just
_
):
# #![allow(unused_variables)] #fn main() { trait Foo { fn foo(&self, baz: u8); } #}