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)     |
| `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                           |
| ------------------- | --------------------------------------------------------- |
| `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.