values to be copied. Rewrite kind computation so that instead of directly
computing the kind it computes what kinds of values are present in the type,
and then derive kinds based on that. I find this easier to think about.
Fixes#4821.
The parser now warns about use of mutbl-ref mode, though it's kind
of a lie since this commit doesn't remove support for the mode.
Changed move_val_init to have stage0 and stage1/2 versions, the latter of
which is demoded.
Changed the type that the typechecker expects the move_val_init
intrinsic to have. After this is pushed, I can make a new snapshot,
which will remove the need for the stage0 versions.
This results in a lot of warnings in rustc. I left them in because
many are bugs and we should fix our code, but Graydon asked that
I not touch every file in the codebase.
