diff --git a/Cargo.lock b/Cargo.lock
index 91e7c671..946c599b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -122,6 +122,15 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "cloudabi"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4344512281c643ae7638bbabc3af17a11307803ec8f0fcad9fae512a8bf36467"
+dependencies = [
+ "bitflags",
+]
+
 [[package]]
 name = "crossbeam-deque"
 version = "0.7.3"
@@ -304,6 +313,15 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "instant"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "63312a18f7ea8760cdd0a7c5aac1a619752a246b833545e3e36d1f81f7cd9e66"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "itoa"
 version = "0.4.5"
@@ -333,9 +351,9 @@ checksum = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 
 [[package]]
 name = "libc"
-version = "0.2.68"
+version = "0.2.77"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dea0c0405123bba743ee3f91f49b1c7cfb684eef0da0a50110f758ccf24cdff0"
+checksum = "f2f96b10ec2560088a8e76961b00d47107b3a625fecb76dedb29ee7ccbf98235"
 
 [[package]]
 name = "lock_api"
@@ -346,6 +364,15 @@ dependencies = [
  "scopeguard",
 ]
 
+[[package]]
+name = "lock_api"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28247cc5a5be2f05fbcd76dd0cf2c7d3b5400cb978a28042abcd4fa0b3f8261c"
+dependencies = [
+ "scopeguard",
+]
+
 [[package]]
 name = "log"
 version = "0.4.8"
@@ -431,19 +458,20 @@ version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f842b1982eb6c2fe34036a4fbfb06dd185a3f5c8edfaacdf7d1ea10b07de6252"
 dependencies = [
- "lock_api",
+ "lock_api 0.3.4",
  "parking_lot_core 0.6.2",
  "rustc_version",
 ]
 
 [[package]]
 name = "parking_lot"
-version = "0.10.2"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3a704eb390aafdc107b0e392f56a82b668e3a71366993b5340f5833fd62505e"
+checksum = "a4893845fa2ca272e647da5d0e46660a314ead9c2fdd9a883aabc32e481a8733"
 dependencies = [
- "lock_api",
- "parking_lot_core 0.7.2",
+ "instant",
+ "lock_api 0.4.1",
+ "parking_lot_core 0.8.0",
 ]
 
 [[package]]
@@ -453,7 +481,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b876b1b9e7ac6e1a74a6da34d25c42e17e8862aa409cbbbdcfc8d86c6f3bc62b"
 dependencies = [
  "cfg-if",
- "cloudabi",
+ "cloudabi 0.0.3",
  "libc",
  "redox_syscall",
  "rustc_version",
@@ -463,15 +491,16 @@ dependencies = [
 
 [[package]]
 name = "parking_lot_core"
-version = "0.7.2"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d58c7c768d4ba344e3e8d72518ac13e259d7c7ade24167003b8488e10b6740a3"
+checksum = "c361aa727dd08437f2f1447be8b59a33b0edd15e0fcee698f935613d9efbca9b"
 dependencies = [
  "cfg-if",
- "cloudabi",
+ "cloudabi 0.1.0",
+ "instant",
  "libc",
  "redox_syscall",
- "smallvec 1.2.0",
+ "smallvec 1.4.2",
  "winapi",
 ]
 
@@ -647,19 +676,19 @@ dependencies = [
 
 [[package]]
 name = "rustc-ap-rustc_arena"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2958af0d6e0458434a25cd3a96f6e19f24f71bf50b900add520dec52e212866b"
+checksum = "e8e941a8fc3878a111d2bbfe78e39522d884136f0b412b12592195f26f653476"
 dependencies = [
  "rustc-ap-rustc_data_structures",
- "smallvec 1.2.0",
+ "smallvec 1.4.2",
 ]
 
 [[package]]
 name = "rustc-ap-rustc_ast"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c82c2510460f2133548e62399e5acd30c25ae6ece30245baab3d1e00c2fefac"
+checksum = "3b58b6b035710df7f339a2bf86f6dafa876efd95439540970e24609e33598ca6"
 dependencies = [
  "bitflags",
  "rustc-ap-rustc_data_structures",
@@ -668,15 +697,15 @@ dependencies = [
  "rustc-ap-rustc_macros",
  "rustc-ap-rustc_serialize",
  "rustc-ap-rustc_span",
- "smallvec 1.2.0",
+ "smallvec 1.4.2",
  "tracing",
 ]
 
 [[package]]
 name = "rustc-ap-rustc_ast_pretty"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "becf4ca1638b214694c71a8752192683048ab8bd47947cc481f57bd48157eeb9"
+checksum = "658d925c0da9e3c5cddc5e54f4fa8c03b41aff1fc6dc5e41837c1118ad010ac0"
 dependencies = [
  "rustc-ap-rustc_ast",
  "rustc-ap-rustc_span",
@@ -686,9 +715,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-ap-rustc_data_structures"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4cd204764727fde9abf75333eb661f058bfc7242062d91019440fe1b240688b"
+checksum = "14ffd17a37e00d77926a0713f191c59ff3aeb2b551a024c7cfffce14bab79be8"
 dependencies = [
  "bitflags",
  "cfg-if",
@@ -696,10 +725,9 @@ dependencies = [
  "ena",
  "indexmap",
  "jobserver",
- "lazy_static",
  "libc",
  "measureme",
- "parking_lot 0.10.2",
+ "parking_lot 0.11.0",
  "rustc-ap-rustc_graphviz",
  "rustc-ap-rustc_index",
  "rustc-ap-rustc_macros",
@@ -707,7 +735,7 @@ dependencies = [
  "rustc-hash",
  "rustc-rayon",
  "rustc-rayon-core",
- "smallvec 1.2.0",
+ "smallvec 1.4.2",
  "stable_deref_trait",
  "stacker",
  "tempfile",
@@ -717,9 +745,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-ap-rustc_errors"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "58116f119e37f14c029f99077b347069621118e048a69df74695b98204e7c136"
+checksum = "2b3263ddcfa9eb911e54a4e8088878dd9fd10e00d8b99b01033ba4a2733fe91d"
 dependencies = [
  "annotate-snippets",
  "atty",
@@ -736,32 +764,31 @@ dependencies = [
 
 [[package]]
 name = "rustc-ap-rustc_feature"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b612bb67d3fc49f395b03fc4ea4384a0145b05afbadab725803074ec827632b"
+checksum = "eea2dc95421bc19bbd4d939399833a882c46b684283b4267ad1fcf982fc043d9"
 dependencies = [
- "lazy_static",
  "rustc-ap-rustc_data_structures",
  "rustc-ap-rustc_span",
 ]
 
 [[package]]
 name = "rustc-ap-rustc_fs_util"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7630ad1a73a8434ee920676148cb5440ac57509bd20e94ec41087fb0b1d11c28"
+checksum = "1e44c1804f09635f83f6cf1e04c2e92f8aeb7b4e850ac6c53d373dab02c13053"
 
 [[package]]
 name = "rustc-ap-rustc_graphviz"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a603fca4817062eb4fb23ff129d475bd66a69fb32f34ed4362ae950cf814b49d"
+checksum = "dc491f2b9be6e928f6df6b287549b8d50c48e8eff8638345155f40fa2cfb785d"
 
 [[package]]
 name = "rustc-ap-rustc_index"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9850c4a5d7c341513e10802bca9588bf8f452ceea2d5cfa87b934246a52622bc"
+checksum = "fa73f3fed413cdb6290738a10267da17b9ae8e02087334778b9a8c9491c5efc0"
 dependencies = [
  "arrayvec",
  "rustc-ap-rustc_macros",
@@ -770,18 +797,18 @@ dependencies = [
 
 [[package]]
 name = "rustc-ap-rustc_lexer"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d86722e5a1a615b198327d0d794cd9cbc8b9db4542276fc51fe078924de68ea"
+checksum = "e993881244a92f3b44cf43c8f22ae2ca5cefe4f55a34e2b65b72ee66fe5ad077"
 dependencies = [
  "unicode-xid",
 ]
 
 [[package]]
 name = "rustc-ap-rustc_macros"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b3fc8482e44cabdda7ac9a8e224aef62ebdf95274d629dac8db3b42321025fea"
+checksum = "4effe366556e1d75344764adf4d54cba7c2fad33dbd07588e96d0853831ddc7c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -791,9 +818,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-ap-rustc_parse"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3716cdcd978a91dbd4a2788400e90e809527f841426fbeb92f882f9b8582f3ab"
+checksum = "0342675835251571471d3dca9ea1576a853a8dfa1f4b0084db283c861223cb60"
 dependencies = [
  "bitflags",
  "rustc-ap-rustc_ast",
@@ -804,26 +831,26 @@ dependencies = [
  "rustc-ap-rustc_lexer",
  "rustc-ap-rustc_session",
  "rustc-ap-rustc_span",
- "smallvec 1.2.0",
+ "smallvec 1.4.2",
  "tracing",
  "unicode-normalization",
 ]
 
 [[package]]
 name = "rustc-ap-rustc_serialize"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c68046d07988b349b2e1c8bc1c9664a1d06519354aa677b9df358c5c5c058da0"
+checksum = "438255ed968d73bf6573aa18d3b8d33c0a85ecdfd14160ef09ff813938e0606c"
 dependencies = [
  "indexmap",
- "smallvec 1.2.0",
+ "smallvec 1.4.2",
 ]
 
 [[package]]
 name = "rustc-ap-rustc_session"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "85735553501a4de0c8904e37b7ccef79cc1c585a7d7f2cfa02cc38e0d149f982"
+checksum = "7d61ff76dede8eb827f6805754900d1097a7046f938f950231b62b448f55bf78"
 dependencies = [
  "bitflags",
  "getopts",
@@ -842,9 +869,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-ap-rustc_span"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1c49ae8a0d3b9e27c6ffe8febeaa30f899294fff012de70625f9ee81c54fda85"
+checksum = "1c267f15c3cfc82a8a441d2bf86bcccf299d1eb625822468e3d8ee6f7c5a1c89"
 dependencies = [
  "cfg-if",
  "md-5",
@@ -861,9 +888,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-ap-rustc_target"
-version = "677.0.0"
+version = "679.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1765f447594740c501c7b666b87639aa7c1dae2bf8c3166d5d2dca16646fd034"
+checksum = "8b1b4b266c4d44aac0f7f83b6741d8f0545b03d1ce32f3b5254f2014225cb96c"
 dependencies = [
  "bitflags",
  "rustc-ap-rustc_data_structures",
@@ -1000,9 +1027,9 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.2.0"
+version = "1.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c2fb2ec9bcd216a5b0d0ccf31ab17b5ed1d627960edff65bbe95d3ce221cefc"
+checksum = "fbee7696b84bbf3d89a1c2eccff0850e3047ed46bfcd2e92c29a2d074d57e252"
 
 [[package]]
 name = "stable_deref_trait"
@@ -1146,7 +1173,7 @@ version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5479532badd04e128284890390c1e876ef7a993d0570b3597ae43dfa1d59afa4"
 dependencies = [
- "smallvec 1.2.0",
+ "smallvec 1.4.2",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 1320df7c..bbad1c0b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -39,31 +39,31 @@ path = "metadata"
 
 [dependencies.rustc_ast_pretty]
 package = "rustc-ap-rustc_ast_pretty"
-version = "677.0.0"
+version = "679.0.0"
 
 [dependencies.rustc_data_structures]
 package = "rustc-ap-rustc_data_structures"
-version = "677.0.0"
+version = "679.0.0"
 
 [dependencies.rustc_errors]
 package = "rustc-ap-rustc_errors"
-version = "677.0.0"
+version = "679.0.0"
 
 [dependencies.rustc_parse]
 package = "rustc-ap-rustc_parse"
-version = "677.0.0"
+version = "679.0.0"
 
 [dependencies.rustc_session]
 package = "rustc-ap-rustc_session"
-version = "677.0.0"
+version = "679.0.0"
 
 [dependencies.rustc_span]
 package = "rustc-ap-rustc_span"
-version = "677.0.0"
+version = "679.0.0"
 
 [dependencies.rustc_ast]
 package = "rustc-ap-rustc_ast"
-version = "677.0.0"
+version = "679.0.0"
 
 [dev-dependencies.racer-testutils]
 version = "0.1"
diff --git a/rust-toolchain b/rust-toolchain
index 0294f6de..cc3f2fd4 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2020-09-02
+nightly-2020-09-23