Member defined in REPL should shadow previously imported member

[Blaisorblade]

Below an (un)reproducible transcript of the REPL not handling shadowing correctly. After both importing and defining f, only the imported one is in scope.

> repl
[...]
scala> object A { def f = 1 }
// defined object A
scala> import A._
scala> def f = "hi"
def f: String
scala> f
val res0: Int = 1

[allanrenucci]

This has to do with the way we handle imports. When compiling an expression, we first import the previous wrapper objects and then the user defined imports. So currently, a definition imported with an import will always take precedence over one defined in a previous run