add -Xsource:3 option. avoid deprecated with

[xuwei-k]

Welcome to Scala 3.5.1 (1.8.0_422, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.

scala> trait A; trait B; trait C { self : A with B => }
1 warning found
-- [E003] Syntax Warning: ------------------------------------------------------
1 |trait A; trait B; trait C { self : A with B => }
  |                                     ^^^^
  |                with as a type operator has been deprecated; use & instead
  |
  | longer explanation available when compiling with `-explain`
// defined trait A
// defined trait B
// defined trait C

scala> trait A; trait B; trait C { self : A & B => }
// defined trait A
// defined trait B
// defined trait C