use & instead of with

[xuwei-k]

prepare latest Scala 3

Welcome to Scala 3.6.1 (21.0.5, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.
                                                                                                                                                                                                                                                 
scala> trait A ; trait B
// defined trait A
// defined trait B

scala> def x: A with B = ???
1 warning found
-- [E003] Syntax Warning: ------------------------------------------------------
1 |def x: A with B = ???
  |         ^^^^
  |         with as a type operator has been deprecated; use & instead
  |
  | longer explanation available when compiling with `-explain`
def x: A & B
                                                                                                                                                                                                                                                 
scala> def x: A & B = ???
def x: A & B

[satorg]

Just for a record: this auto-formatting is hurting my eyes. I wonder if scalafmt can be configured to do better in such cases.

[satorg]

Oh, this one is even more baffling :(

[satorg]

Looks good for me, thank you!