doc: Fold information from the memory model interlude in the tutorial elsewhere
s/moved variable/moved value/
Merge pull request #4440 from pcwalton/tutorial

doc: Fold information from the memory model interlude in the tutorial elsewhere
Merge pull request #4493 from jbclements/rename-moved-variable-to-moved-value

s/moved variable/moved value/
Minor cleanup and eliminate a bad copy
librustc: Implement write guards for borrowing `@mut` to `&` or `&mut`. r=nmatsakis
test: Fix busted compile-fail tests. rs=bustage