bors 946654a721 auto merge of #17197 : nikomatsakis/rust/issue-5527-trait-reform-revisited, r=pcwalton
This patch does not make many functional changes, but does a lot of restructuring towards the goals of #5527. This is the biggest patch, basically, that should enable most of the other patches in a relatively straightforward way.

Major changes:

- Do not track impls through trans, instead recompute as needed.
- Isolate trait matching code into its own module, carefully structure to distinguish various phases (selection vs confirmation vs fulfillment)
- Consider where clauses in their more general form
- Integrate checking of builtin bounds into the  trait matching process, rather than doing it separately in kind.rs (important for opt-in builtin bounds)

What is not included:

- Where clauses are still not generalized. This should be a straightforward follow-up patch.
- Caching. I did not include much caching. I have plans for various kinds of caching we can do. Should be straightforward. Preliminary perf measurements suggested that this branch keeps compilation times roughly what they are.
- Method resolution. The initial algorithm I proposed for #5527 does not work as well as I hoped. I have a revised plan which is much more similar to what we do today.
- Deref vs deref-mut. The initial fix I had worked great for autoderef, but not for explicit deref. 
- Permitting blanket impls to overlap with specific impls. Initial plan to consider all nested obligations before considering an impl to match caused many compilation errors. We have a revised plan but it is not implemented here, should be a relatively straightforward extension.
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This is a preliminary version of the Rust compiler, libraries and tools.

Source layout:

Path Description
librustc/ The self-hosted compiler
liballoc/ Rust's core allocation library
libcore/ The Rust core library
libdebug/ Debugging utilities
libstd/ The standard library (imported and linked by default)
libgreen/ The M:N runtime library
libnative/ The 1:1 runtime library
libsyntax/ The Rust parser and pretty-printer
libtest/ Rust's test-runner code
------------------- ---------------------------------------------------------
libarena/ The arena (a fast but limited) memory allocator
libbacktrace/ The libbacktrace library
libcollections/ A collection of useful data structures and containers
libflate/ Simple compression library
libfmt_macros/ Macro support for format strings
libfourcc/ Data format identifier library
libgetopts/ Get command-line-options library
libglob/ Unix glob patterns library
libgraphviz/ Generating files for Graphviz
libhexfloat/ Hexadecimal floating-point literals
liblibc/ Bindings for the C standard library
liblog/ Utilities for program-wide and customizable logging
libnum/ Extended number support library (complex, rational, etc)
librand/ Random numbers and distributions
libregex/ Regular expressions
libregex_macros/ The regex! syntax extension
libsemver/ Rust's semantic versioning library
libserialize/ Encode-Decode types library
libsync/ Concurrency mechanisms and primitives
libterm/ ANSI color library for terminals
libtime/ Time operations library
liburl/ URL handling lirary
libuuid/ UUID's handling code
------------------- ---------------------------------------------------------
rt/ The runtime system
rt/rust_*.c - Some of the runtime services
rt/vg - Valgrind headers
rt/msvc - MSVC support
rt/sundown - The Markdown library used by rustdoc
------------------- ---------------------------------------------------------
compiletest/ The test runner
test/ Testsuite
test/codegen - Tests for the LLVM IR infrastructure
test/compile-fail - Tests that should fail to compile
test/debug-info - Tests for the debuginfo tool
test/run-fail - Tests that should compile, run and fail
test/run-make - Tests that depend on a Makefile infrastructure
test/run-pass - Tests that should compile, run and succeed
test/bench - Benchmarks and miscellaneous
test/pretty - Pretty-printer tests
test/auxiliary - Dependencies of tests
------------------- ---------------------------------------------------------
librustdoc/ The Rust API documentation tool
libuv/ The libuv submodule
librustuv/ Rust libuv support code
------------------- ---------------------------------------------------------
llvm/ The LLVM submodule
rustllvm/ LLVM support code
------------------- ---------------------------------------------------------
etc/ Scripts, editors support, misc

NOTE: This list (especially the second part of the table which contains modules and libraries) is highly volatile and subject to change.