- replaces "move-only" terminology with "noncopyable"
- replaces compiler jargon like "guaranteed parameters"
and "lvalue" with corresponding language-level notions
- simplifies diagnostics about closures.
and probably more.
rdar://109281444
Before this change it was possible to:
1. Call mutating methods on a consume result.
2. assign into a consume (e.x.: var x = ...; (consume x) = value.
From an implementation perspective, this involved just taking the logic I
already used for the CopyExpr and reusing it for ConsumeExpr with some small
tweaks.
rdar://109479440
the main things still left behind the experimental flag(s) are
- move-only classes (guarded by MoveOnlyClasses feature)
- noimplicitcopy
- the _borrow operator
Originally move when it was in the stdlib as _move was behind a keyword but we
moved it in front to allow for some testing. Now that we are going with a
keyword (which we can't leave in/deprecate) move it behind the move only
experimental flag until this gets through evolution.
I did this by requiring this in the typechecker. This will ensure that when we
emit a move, we are guaranteed to have a value decl ref that we can evaluate. It also ensures that we can't _move fields.
auto
