Rust std dreams

(see Rust dreams for a similar list, but for the language)

Here are things I wish could be changed in the Rust standard library (std).

• Remove std, and retain alloc without any of the types in collections module.

  That removed code can have official status (to retain trust), maybe even distributed with rustup (to retain convenience).

• Rename Vec to Array, a more clear/obvious name. An alternative is List, but that type in Python accepts members of different types, which is not the case for Vec.

• Consistent names for string-y types:

  	current	wish
  string	str	Str
  	String	StrOwned
  os string	OsStr	OsStr (same)
  	OsString	OsStrOwned
  C string	CStr	CStr (same)
  	CString	CStrOwned
  fs path	Path	Path (same)
  	PathBuf	PathOwned

• Remove std::sync::mpsc from stdlib, making it available externally... it does not feel general enough. (more issues)

• Remove per-type methods where trait impls offer same functionality, for generality:

  current	wish
  PathBuf::as_path	PathBuf::as_ref
  Path::to_path_buf	Path::to_owned
  Vec::append	Vec::extend

• Remove all deprecated APIs, most notable being the try! macro

• Renames of panic methods (inspiration)

  current	wish
  foo.unwrap	(remove)
  foo.expect("message")	foo.or_panic("message")
  foo.unwrap_or	foo.or
  foo.unwrap_or_default	foo.or_default
  foo.unwrap_or_else	foo.or_else

  It feels somewhat implicit, but maybe not so bad.