diff --git a/.gitmodules b/.gitmodules
index bdc14d8c3be71..9bc2a6a70eb45 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -22,7 +22,7 @@
 	path = src/doc/nomicon
 	url = https://github.com/rust-lang-nursery/nomicon
 [submodule "src/tools/cargo"]
-	path = src/tools/cargo
+	path = cargo
 	url = https://github.com/rust-lang/cargo
 [submodule "reference"]
 	path = src/doc/reference
diff --git a/cargo b/cargo
new file mode 160000
index 0000000000000..5f3b9c4c6a7be
--- /dev/null
+++ b/cargo
@@ -0,0 +1 @@
+Subproject commit 5f3b9c4c6a7be1f177d6024cb83d150b6479148a
diff --git a/src/Cargo.lock b/src/Cargo.lock
index f4174693a5771..6dc71e8b602db 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -6,23 +6,6 @@ dependencies = [
  "libc 0.0.0",
 ]
 
-[[package]]
-name = "advapi32-sys"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "aho-corasick"
-version = "0.5.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "aho-corasick"
 version = "0.6.2"
@@ -90,11 +73,6 @@ dependencies = [
  "toml 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "bufstream"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "build-manifest"
 version = "0.1.0"
@@ -110,81 +88,10 @@ dependencies = [
  "filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "cargo"
-version = "0.18.0"
-dependencies = [
- "advapi32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bufstream 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "cargotest 0.1.0",
- "crates-io 0.7.0",
- "crossbeam 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "curl 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "docopt 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "env_logger 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "flate2 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "fs2 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "git2 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "git2-curl 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "hamcrest 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "handlebars 0.25.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "libgit2-sys 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "miow 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "psapi-sys 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 0.9.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_ignored 0.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "shell-escape 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "tar 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempdir 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "term 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "toml 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "cargotest"
-version = "0.1.0"
-dependencies = [
- "bufstream 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "cargo 0.18.0",
- "filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "flate2 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "git2 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "hamcrest 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "tar 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempdir 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "term 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "cargotest2"
 version = "0.1.0"
 
-[[package]]
-name = "cfg-if"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "clap"
 version = "2.20.5"
@@ -240,58 +147,6 @@ dependencies = [
 name = "core"
 version = "0.0.0"
 
-[[package]]
-name = "crates-io"
-version = "0.7.0"
-dependencies = [
- "curl 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 0.9.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "crossbeam"
-version = "0.2.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "curl"
-version = "0.4.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "curl-sys 0.3.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-probe 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "curl-sys"
-version = "0.3.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "libz-sys 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "docopt"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "lazy_static 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "dtoa"
 version = "0.4.1"
@@ -334,48 +189,15 @@ dependencies = [
  "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "flate2"
-version = "0.2.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "miniz-sys 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "fmt_macros"
 version = "0.0.0"
 
-[[package]]
-name = "foreign-types"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "fs2"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "gcc"
 version = "0.3.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "gdi32-sys"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "getopts"
 version = "0.0.0"
@@ -385,48 +207,10 @@ name = "getopts"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "git2"
-version = "0.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "libgit2-sys 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-probe 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "git2-curl"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "curl 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "git2 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "glob"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "graphviz"
 version = "0.0.0"
 
-[[package]]
-name = "hamcrest"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "handlebars"
 version = "0.25.1"
@@ -441,16 +225,6 @@ dependencies = [
  "serde_json 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "idna"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "matches 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-bidi 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-normalization 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "itoa"
 version = "0.3.1"
@@ -482,43 +256,6 @@ name = "libc"
 version = "0.2.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "libgit2-sys"
-version = "0.6.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cmake 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "curl-sys 0.3.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "libssh2-sys 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "libz-sys 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "libssh2-sys"
-version = "0.2.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cmake 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "libz-sys 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "libz-sys"
-version = "1.0.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "linkchecker"
 version = "0.1.0"
@@ -532,11 +269,6 @@ name = "log"
 version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "matches"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "mdbook"
 version = "0.0.17"
@@ -554,14 +286,6 @@ dependencies = [
  "toml 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "memchr"
-version = "0.1.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "memchr"
 version = "1.0.1"
@@ -570,99 +294,6 @@ dependencies = [
  "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "miniz-sys"
-version = "0.1.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "miow"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "net2 0.2.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "net2"
-version = "0.2.26"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "num"
-version = "0.1.36"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-bigint 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-complex 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-iter 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-rational 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "num-bigint"
-version = "0.1.35"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "num-complex"
-version = "0.1.35"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "num-integer"
-version = "0.1.32"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "num-iter"
-version = "0.1.32"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "num-rational"
-version = "0.1.35"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-bigint 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "num-traits"
 version = "0.1.36"
@@ -676,48 +307,11 @@ dependencies = [
  "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "num_cpus"
-version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "open"
 version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "openssl"
-version = "0.9.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
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-
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 [[package]]
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@@ -741,11 +335,6 @@ name = "pest"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
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@@ -762,15 +351,6 @@ dependencies = [
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 ]
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
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-
 [[package]]
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@@ -793,11 +373,6 @@ name = "quick-error"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
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@@ -805,26 +380,6 @@ dependencies = [
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 ]
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
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-
 [[package]]
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@@ -837,11 +392,6 @@ dependencies = [
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-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
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@@ -1218,50 +768,11 @@ dependencies = [
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-
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@@ -1277,11 +788,6 @@ dependencies = [
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -1367,36 +855,10 @@ dependencies = [
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 [[package]]
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@@ -1415,15 +877,6 @@ dependencies = [
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@@ -1433,14 +886,6 @@ dependencies = [
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@@ -1470,19 +915,6 @@ dependencies = [
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diff --git a/src/Cargo.toml b/src/Cargo.toml
index c5ca80accbf02..0dafbb8428e3e 100644
--- a/src/Cargo.toml
+++ b/src/Cargo.toml
@@ -13,7 +13,6 @@ members = [
   "tools/build-manifest",
   "tools/qemu-test-client",
   "tools/qemu-test-server",
-  "tools/cargo",
 ]
 
 # Curiously, compiletest will segfault if compiled with opt-level=3 on 64-bit
diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index 46d8d4b4aab2d..3459c1d2b8425 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -417,7 +417,10 @@ pub fn tool(build: &Build, stage: u32, target: &str, tool: &str) {
     // build.clear_if_dirty(&out_dir, &libstd_stamp(build, stage, &host, target));
 
     let mut cargo = build.cargo(&compiler, Mode::Tool, target, "build");
-    let dir = build.src.join("src/tools").join(tool);
+    let mut dir = build.src.join(tool);
+    if !dir.exists() {
+        dir = build.src.join("src/tools").join(tool);
+    }
     cargo.arg("--manifest-path").arg(dir.join("Cargo.toml"));
 
     // We don't want to build tools dynamically as they'll be running across
diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs
index 67e4dad83ce88..5c547f7af5f8c 100644
--- a/src/bootstrap/dist.rs
+++ b/src/bootstrap/dist.rs
@@ -392,6 +392,7 @@ pub fn rust_src(build: &Build) {
     let src_dirs = [
         "man",
         "src",
+        "cargo",
     ];
 
     let filter_fn = move |path: &Path| {
@@ -535,9 +536,9 @@ pub fn cargo(build: &Build, stage: u32, target: &str) {
 
     let src = build.src.join("src/tools/cargo");
     let etc = src.join("src/etc");
-    let release_num = &build.crates["cargo"].version;
-    let name = format!("cargo-{}", build.package_vers(release_num));
-    let version = build.cargo_info.version(build, release_num);
+    let release_num = build.cargo_release_num();
+    let name = format!("cargo-{}", build.package_vers(&release_num));
+    let version = build.cargo_info.version(build, &release_num);
 
     let tmp = tmpdir(build);
     let image = tmp.join("cargo-image");
@@ -594,7 +595,7 @@ pub fn extended(build: &Build, stage: u32, target: &str) {
     println!("Dist extended stage{} ({})", stage, target);
 
     let dist = distdir(build);
-    let cargo_vers = &build.crates["cargo"].version;
+    let cargo_vers = build.cargo_release_num();
     let rustc_installer = dist.join(format!("{}-{}.tar.gz",
                                             pkgname(build, "rustc"),
                                             target));
@@ -943,7 +944,7 @@ pub fn hash_and_sign(build: &Build) {
     cmd.arg(distdir(build));
     cmd.arg(today.trim());
     cmd.arg(build.rust_package_vers());
-    cmd.arg(build.cargo_info.version(build, &build.crates["cargo"].version));
+    cmd.arg(build.cargo_info.version(build, &build.cargo_release_num()));
     cmd.arg(addr);
 
     t!(fs::create_dir_all(distdir(build)));
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index 071d0b0b09009..4831b38083740 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -76,11 +76,12 @@ extern crate num_cpus;
 extern crate rustc_serialize;
 extern crate toml;
 
-use std::collections::HashMap;
 use std::cmp;
+use std::collections::HashMap;
 use std::env;
 use std::ffi::OsString;
 use std::fs::{self, File};
+use std::io::Read;
 use std::path::{Component, PathBuf, Path};
 use std::process::Command;
 
@@ -995,6 +996,21 @@ impl Build {
         self.rust_info.version(self, channel::CFG_RELEASE_NUM)
     }
 
+    /// Returns the `a.b.c` version that Cargo is at.
+    fn cargo_release_num(&self) -> String {
+        let mut toml = String::new();
+        t!(t!(File::open(self.src.join("cargo/Cargo.toml"))).read_to_string(&mut toml));
+        for line in toml.lines() {
+            let prefix = "version = \"";
+            let suffix = "\"";
+            if line.starts_with(prefix) && line.ends_with(suffix) {
+                return line[prefix.len()..line.len() - suffix.len()].to_string()
+            }
+        }
+
+        panic!("failed to find version in cargo's Cargo.toml")
+    }
+
     /// Returns whether unstable features should be enabled for the compiler
     /// we're building.
     fn unstable_features(&self) -> bool {
diff --git a/src/bootstrap/step.rs b/src/bootstrap/step.rs
index a5c0d11d21985..a11726a57dbdd 100644
--- a/src/bootstrap/step.rs
+++ b/src/bootstrap/step.rs
@@ -559,7 +559,7 @@ pub fn build_rules<'a>(build: &'a Build) -> Rules {
     rules.build("tool-qemu-test-client", "src/tools/qemu-test-client")
          .dep(|s| s.name("libstd"))
          .run(move |s| compile::tool(build, s.stage, s.target, "qemu-test-client"));
-    rules.build("tool-cargo", "src/tools/cargo")
+    rules.build("tool-cargo", "cargo")
          .dep(|s| s.name("libstd"))
          .dep(|s| s.stage(0).host(s.target).name("openssl"))
          .dep(move |s| {
diff --git a/src/tools/cargo b/src/tools/cargo
deleted file mode 160000
index d17b61aa5a2ca..0000000000000
--- a/src/tools/cargo
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit d17b61aa5a2ca790f268a043bffdb0ffb04f0ec7