typeof() in the type language

[bblum]

I'm not sure if this would be useful in every-day code, but I just wrote some code where it would've been nice to say:

let foo: typeof(earlier_thing) = unsafe::transmute(...);

instead of

let foo: complicated::typename::that_might_change_later = unsafe::transmute(...);

[sanxiyn]

Nominating for backwards compatible milestone.

[graydon]

reserving the keyword at least is required for this to be backwards-compatible; actual feature is later

[graydon]

accepted for backwards-compatible milestone

[cmr]

This would be very nice.

[thestinger]

This is the kind of thing we really need to go through the new formal RFC process. There's never going to be enough discussion here. It's no longer a backwards compatibility issue because typeof is reserved.