RFC to require `impl MyStruct` to be in the same module as the definition of `MyStruct`

This fixes #15060 and #3785.
RFC for `if let` expression
Add RFC to feature gate some slice patterns
RFC: tuple accessors
Fix indexing example to be zero-based
Improve semantics explanation
More sensible ‘Alternatives’ section

Indexing of tuples makes no sense because not all tuples are homogenous.
Minor style & formatting fixes
RFC: Notation for slicing
Add rationale for .. notation
RFC: conventions for ownership variants
RFC: Change syntax of subslice matching
Fix typo
Merge pull request #209 from flugsio/patch-1

Fix typo
Initial commit
Add note about feature-gate

Also fix a couple of typos.
Merge remote-tracking branch 'kballard/if_let'
if-let is RFC 51
Add feature gate; remove special syntactic support for nested indices
Update to _move

Based on the weekly meeting:

  https://github.com/rust-lang/meeting-minutes/blob/master/weekly-meetings/2014-08-26.md