Eta-expansion with empty block after fewerBraces colon

[prolativ]

Compiler version

3.3.0-RC1-bin-20221130-72c4ffd-NIGHTLY

Minimized code

val x = Seq(1, 2, 3).map:

Output

This compiles and the type of x is (Int => Any) => Seq[Any]

Expectation

This should not compile and raise a syntax error telling that the argument block after a colon cannot be empty

[prolativ]

This is especially problematic in REPL because this doesn't even let you write the body of the indented block after a colon. Nevertheless the issue is not REPL-specific