More problems with `let`

[71104]

let console.log.lol = 0 in console.log 5  # prints "undefined" instead of "5"

let console.log.lol = 0 in console.log.lol  # runtime error

[71104]

The second one happens because there's a marshal round-trip for the log function and "expandos" don't get marshalled towards the native side. That is, when the expanded log closure is marshalled to a native function, the native function doesn't have the extra "lol" property.

[71104]

As of 6b61305, the second one is gone and the problem with the first one is that after the expansion console.log's character becomes undefined.