Blocks are top level in REPL (Scala 2 repl will assign the block to a variable)

Compiler version

3.0.0-RC1

Minimized code + Output

$ scala
Welcome to Scala 2.13.6 (OpenJDK 64-Bit Server VM, Java 11.0.11).
Type in expressions for evaluation. Or try :help.

scala> { val local = 42 }

scala> local
       ^
       error: not found: value local

scala> 
:quit

$ scala3-repl
scala> { val local = 42 }
val local: Int = 42

scala> local                                                                                             
val res0: Int = 42

Expectation

Scala 3 in REPL should work as Scala 2 and as compiled Scala 3. The language ref says that local names are local and Scala 3 should give the same result above as Scala 2.

[smarter]

Also, no matter what we do, the REPL will always have slightly different semantics than typing code in a file (e.g. if you type class X, then object X on the next line, that doesn’t define a companion), if this bothers you, I suggest teaching students using worksheets instead of the REPL (this is what the scala mooc does), worksheets are also somewhat magic but behave a lot more like regular code.

[bjornregnell]

@som-snytt That would be great! @smarter Yeah we talk alot about that you e.g in REPL can re-define the same name many times without compilation error but the students seem to grok quickly that this exception is convenient… I’ll have to live with “fixed in ammonite” ideals 😃 But nice with paste. I’ll redo my exercises on name space in REPL and open an object Locally: instead or even just a new hand-rolled def local = val invisibleOutside = 42 etc to show the name space thing. So there are workarounds of course. (But I still like regularity, buyt convenience is nice as well)