This makes it possible to de-initialize values anywhere in
memory, which is needed, for example, for a fast imlementation
of vec::pop.

To match the init_fn() and init_fn_mut() changes.

fix #1352: change param order on vec::init_fn (and vec::init_fn_mut), putting block in final position.

(Commit also includes lots of changes to remove '.'s that a git
merge messed up, or else it was monkeys.)

Use ifaces instead of objs, stop wrapping everything in two (or three)
layers of no-value-added indirection, and remove some of the more
pointless/outdated idioms from the code.

It would occasionally pass the wrong type parameter, when calling
a generic method from a generic impl on a bounded param type.

And remove support for the old syntax

Aligning the type parameters of the ifaces, impls, and methods
correctly in typeck is almost brain surgery. Seems to work now for
everything I threw at it, but might still break in other corner cases.

Issue #1227

This is a simple wrapper around grow for the common
case of pushing a value on the end of a vector.

The safe-reference checker requires a copy of each mapped-over element
only when the vector is mutable. Let's not pay that cost for immutable
vectors.

This involved adding 'copy' to more generics than I hoped, but an
experiment with making it implicit showed that that way lies madness --
unless enforced, you will not remember to mark functions that don't
copy as not requiring copyable kind.

Issue #1177

Issue #925

This patch changes how to specify ABI and link name of a native module.

Before:
  native "cdecl" mod llvm = "rustllvm" {...}

After:
  #[abi = "cdecl"]
  #[link_name = "rustllvm"]
  native mod llvm {...}

The old optional syntax for ABI and link name is no longer supported.

Fixes issue #547

Compare to str::concat

Per haskell, to go with head/tail, and last.

Put all types first, then predicates, then functions