gentoo resync : 07.05.2021

4 files changed, 820 insertions, 3 deletions

diff --git a/dev-lang/rust/Manifest b/dev-lang/rust/Manifest
index 5cf9bbb7d395..351c298d97a4 100644
--- a/dev-lang/rust/Manifest
+++ b/dev-lang/rust/Manifest
@@ -1,26 +1,76 @@
 AUX 1.47.0-ignore-broken-and-non-applicable-tests.patch 2862 BLAKE2B 96363bfcaf3634185160d54f475711409c5af1e31b8deb3f1cb8650629eed6f4db6b8d758b84055c9ebe2983a213485f9d4d6de4f551ea1e3d122f7c3baad77e SHA512 4a2c7eab2d3930ba6d8bc042f52c993683a3e21bf023ae609bfb4db65df8c5750ce94264d6ee9196e4dfd3b3e204f10c70d6f3a2e752d0b373fee4ada4c5fe53
 AUX 1.49.0-gentoo-musl-target-specs.patch 6377 BLAKE2B 07e037353210292bc576ebbbda2afc489efeb696dffb34b4c5edffbb512b0ba5944cf641e625dd8a158cc7234b70d49d377397aab8cb9a86b4ec6f5a50a6cba6 SHA512 e166d4ed3e321257cef03655be98915badef432de10aa2bde2a4b9f1913dbb774a29a72d7d2861f69d02a37fd9f7c753c551a3e65fb7da4dfa78a8601eab8d38
 AUX 1.51.0-bootstrap-panic.patch 1508 BLAKE2B c5fec1047e0fd5ec7413a4555edb427f192ab5f7e6012ca52ecb5809034f932c5acc4a2be17cf7ac2e344acfdcbb380dbf208fab45635f264924389ef044c0fc SHA512 9209503c56b56bbc3aaafc7bc5a91b53099f24b21d19a345270ede4963a5cafe82161a419653cf25ee05a3e02a86d0cbfc63947d9c9a78506ab6e516fd94488f
+AUX 1.51.0-slow-doc-install.patch 3408 BLAKE2B b4fc3512a942e5425ebc9fdef5a23ea1d5c9515a8f00fc4a4f54af8c978bb81ab64d44650cb1a48e7cb87d87bc43905e4d7165b6f2b49614cf3c3d5e627b7c76 SHA512 5f2dc4968cde7ec7c47dea5c0db4d603def69dc81fdad051fd175813f2496cf96b6d042076641d170bb544fcd64b73197f4afbfa2603b27448790680afc2da6e
 AUX rustc-1.51.0-backport-pr81728.patch 6614 BLAKE2B 886dcb10fafba0a388a5230ddf3688844493ab902b6e93f65379eaaa7313b8363b601ac3b115b53dfedc5e02879790fd5df3d30fe2b5d3fe11666fbcdbf29df0 SHA512 e68f116293770a9ba1f5d11e19b445d930f93268f88c634a9975c532ecdb04e75a3dde92a1e56b57e22630d3bb659ce7a2e849656c7d9541b85369e1db41bcdf
 AUX rustc-1.51.0-backport-pr81741.patch 1832 BLAKE2B 62f333f7aa81e5889ad266c322badf0949f041500c5be099b5b03150b851de255e43403aee46ef047190f3e5aa75055ec07d250534be16c4e8731a2fb863aa6b SHA512 7a4d3d6d4528c9049f255d6c6eb1b023fea11f6a8e0e193a8f8aefd23237fd05c3505d6a9de5d571f24403e9e8d7d7b8ffd783b4975db50ba9c54aa8585fbcd2
 AUX rustc-1.51.0-backport-pr82289.patch 3403 BLAKE2B 67e6ed9c8ad2398baddf51bc901169db7aab5d2692040356df8f6609866a0880d679b2bb2647b93d37a47f89eb07f4ea066dd22f25ddb6422ec49b1c3356f3b8 SHA512 803ae2873106e99a353b0c807c5fccd694ea02238d2647a0296297afafdde05573930b94044d26e2ffde8b0fc798e195a0f29cd81cc95291a5dfd74d36d21a1f
 AUX rustc-1.51.0-backport-pr82292.patch 3968 BLAKE2B c9e9f07ccf2f80e13a6e701fdf13680ee1a8d3c4d83e72e0abbe50f3a05aafe67c5dfa59a4ace938491c53205d5897f5bc5dd204b33ab11bf0b5dd5cf8a6cfe3 SHA512 a3b237941c6f5af22a1f692bf69632e5623b22d5a66b8aee900eae1d16bfee11fcc6979976c9f68e27409c1b03ba3945d0de4cd217a29d6e0d93e1de82b66335
 AUX rustc-1.51.0-backport-pr83629.patch 4860 BLAKE2B 8a42293184820b5c34a133af37bfa5956ad5f83d41db0333b8539d106a7dac9c93b27aa815d98ac889667796013704d25532faf7b8ff71b3d5a2582dad33271b SHA512 3bff1e63f224d4ec0ec9ba98044eff4310bc410fb2518a4cdc868e3817ec2eae88697e7771e03d514c29066fa6c3650c8473555868b305f53f8465e5bbc77d87
 DIST rust-1.50.0-aarch64-unknown-linux-gnu.tar.xz 203382140 BLAKE2B c9547661356bfb2eb328992ecbfd488114bc68c00e551cbbeb925fd1650b5a4c0ab33145c6e994184766ef5046cc2881eb0009ac9d9448208cf896317bf47c63 SHA512 e6b409afc8e85a88ecb9ff439a6eb9dcb93d5553e81549fb4f332b9e2d946dce0424319c5092e60aab9435944af70d0117d15c12d54d2059ef73c1fdf36d8273
+DIST rust-1.50.0-aarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 2fb27b64770fe6594aa4d855697d918998d8d60b951589a965a245ad0da485d302b23b7a3e2d1e1715719d05e43967e607cdf77b826bf15bd6bb1ab44a43f94d SHA512 a9a4b9e866bb9fed6d6933d7b9060ce98dd9a71f2c86bd224fd0489dd51e80d266e6816fda064f65e063dd01083912548a39c82a0389b280d7823e9ef4b2241e
 DIST rust-1.50.0-aarch64-unknown-linux-musl.tar.xz 204473556 BLAKE2B b47fe60f8e558a673b1c5fa47a0ebe9f73b09012b5df718baf0683536fa94d840cf0006830f6f4c36740d5e598b1c67b9d0df69a4e8d698520f05f5644cc3b69 SHA512 6a15af6a30c59325c21587689e3f99ca20a9a8ee0b19866569f2f7405d2b176ed88903776799e1ebcabbfc665b5e0f3c7878f841db6c5a75eceda57ace18185a
+DIST rust-1.50.0-aarch64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B db41d9aba2948b2da29722534bad85440e7a5f7025748422860f430f06d84f2a9d0ef348396f8dd222677858f2256663b57865c0a21c7daa23b142211c3582f2 SHA512 ea1770fc51855dc131f9aafc8cfa02d5baae25b9512d7167a7a67c0e93d3464cfb9c48a24a7391bd3ffb96ef51e302a55835880d10878dc1c7b1c0dc6a83711e
 DIST rust-1.50.0-arm-unknown-linux-gnueabi.tar.xz 193322872 BLAKE2B 2654e604a609f287b2722bbcac325461cc8a84d47e449470da1925f3d21a042d665e55d07f4f268e37630184998ed330b2c2e315485ebeee960c63555550c9cd SHA512 eb3aefa4ff7d2b832a847b6d4fd4427d88885cc72c3a9f97837e2516d202af39da7d523de2d1578fde20aeb76e843a84c37b4ba33f85668caa0b28d63a20968a
+DIST rust-1.50.0-arm-unknown-linux-gnueabi.tar.xz.asc 801 BLAKE2B 2927ca6c92b5d14436a1c785a231c4191ed0d1cdda59b8eac81d073d1a6c75aac70947d5c85f273b72cf7df977617d89372cc817493597cc94fab122fbc6a08b SHA512 53b8f4e77a56f453e0cd1b0dfe88c667a38606ac07389258f60809cd823205ba82320604bc41039d70c4e55deb641e447d605f6ae7518ffe7468f0bd79738fbd
 DIST rust-1.50.0-arm-unknown-linux-gnueabihf.tar.xz 191287452 BLAKE2B 34958b97d034f6c643036c61d64e25aaedf1c93046ca039e39c9083a54d030d715d17a3174bd69bdad3f9bdb8b89c9b92f977b7d3c29da4eb28efe933402e86b SHA512 7b1f61fd53fbb361fc6b3ee603917f899f3cfc8062df3cadb0751e8014e1e2633f32ba198912e8bca34102543c427f2607e861b724143d60fd1f9682578be70d
+DIST rust-1.50.0-arm-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 8cf492d8d6fa31e2c630b849bfb166501a0b8abdbb4ea4529aaf29484feb9349ce06c161bb129e32b65306a01058d29336333fad00699d963eaa3de75a2fa2c8 SHA512 85706b922eae5112f067ce1c7454c505c73516db2fb22bd66b5c2116c967b8df4b9140360ccb4c78e15e7f6d6ce24421ead0e8456b48ca28bd3a70d2b8f0298d
 DIST rust-1.50.0-armv7-unknown-linux-gnueabihf.tar.xz 194656336 BLAKE2B d02323d9f47d380f4a06e8273b02ac3c9091257400a59b3efd1140ef22aa3bcbb71b4c5e70aaeb2cd118839a84b3513d9c85ff8020b5a1f6e68791ae5d81b8f3 SHA512 c3314436afc4ebed697bf6828b9eacbc12f96838b156241331a3b71e99e1438f8ad82e701615ea302ebfc459464479442fe653232bd319cf824027362438970d
+DIST rust-1.50.0-armv7-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B ee81ed5ed81e587e6972648dba990ba330f689fd5f96513d5abc982b9e03bc38ea197c709dad73e1964ba362208099c98c36dec949877676eb3ce9b9509d45c0 SHA512 f7d07aba9c56dbfc94ae3bb44272495e05cc69a8f99c0ad9e668694b5009f32e4fdd934f50ed4ad219023922d5fc6e54bea40e9fd7e17ee4de48fa6a2f565623
 DIST rust-1.50.0-i686-unknown-linux-gnu.tar.xz 222946404 BLAKE2B 38801f395ab8f5aeee1cb709cd7fda6b6573476f9d763931086c76b0064ec0d5dff03415bc2f6f13419fb1a326cb44a0086dd42db99d1e14d520b33c6382e340 SHA512 bff117733d11731f56e8659265d0b47327e2af3f7c46aca494747a92b4f634dd35fa9731a1be59dd69821042f88bded253e1d7b5693ca237c9a167408ca7f898
+DIST rust-1.50.0-i686-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 2327426a92265c52eb96d8aa65e1cc226d253e2ae416238b4392374c13e90c7d7d99dca9f581703594825574f01b930c092f20786469c3022229c0152674c132 SHA512 a8bdb87723860bf246829e50de2f1c92ee314e25d310982f45b0e3aea82d7fe361637eb1d90f590fdbfd2fc3604959d6c5a9144f04e20c11336ae7b3b2eaae5d
 DIST rust-1.50.0-mips-unknown-linux-gnu.tar.xz 150524936 BLAKE2B 950424444394dd55fd81c6b850798552166d78588fcc2c4dfdd4bbc900600957eed06c4a03c83713f2f820252949f57651d69e4d2a2b78d7de42fd7e0c0404f4 SHA512 849d70b5f4b4364070c5f708e466a86afead7d82d7fde4d1ef7c8800bc1ebcafdd4e1bc69f059e393fd8fce104f2d97201f09ecb3b894676e6ff6db9c949c897
+DIST rust-1.50.0-mips-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 3e051e17016274dbf7b6b6649d7506485c2f97425e4d7ce456b403615be2f327a99634eb6831d730b7e7b5a9f6d4eecc78d9d9a50a67393ca462bd949f80b5e3 SHA512 ed5b2cc3308dd1d632b8560552aeb46c064475d0c1ad7dba977cf9659b3d115548826d546b0d4a3ecc24a92d6c8c9f27a2809b52cedd507dda3063b118b0eeb0
 DIST rust-1.50.0-mips64-unknown-linux-gnuabi64.tar.xz 159792596 BLAKE2B a361c13c036d7cc964ace781c34ed815946c976071d38d361110856e889174e2629ad9602dde5f6d5a704044cab670687b67643470b199ee18e95944dbccba16 SHA512 d85c2abff3249ccca63d14abfa85f5320e5d227b17faf7b4b47a5254a4b8ee3a4cf3ccb84e31f13dae7780176411e2a5d04894e2422ae5921f547cc5e07fd1b9
+DIST rust-1.50.0-mips64-unknown-linux-gnuabi64.tar.xz.asc 801 BLAKE2B 049a4a10e28ebc37ed69e03d4780a40e4b887d00a88faa9822b285c95c2e7b1c5ca208e95e3356cf92bc3b5238563c607d3b6c9f3e43bdfa492fddc7a121cd9d SHA512 ae413182c24cdada092ab808fa2dc335137bae848a6f6ba480807bd62e20a9f2f498e22efc8309511a66fe7095cfdbf11355f6dd94f7a260da83bc065dbb8d7e
 DIST rust-1.50.0-mipsel-unknown-linux-gnu.tar.xz 156597932 BLAKE2B 57bf7d105f6f9d3a50904466439e88e32c99b5fd85f220ef48e82fe91b2c05c28d6783233dd3e9ba7b49e79eeeb358cd1df60369bbd927a9a867a0bdaed471c7 SHA512 019df8180520bc4fd29a258017e2477a59a30338d921f185871f64aa81d8b5499e88676d09d5887f9c6726824ae4bf50f8a9e6fae1f03e9e728f0f08ab0271c4
+DIST rust-1.50.0-mipsel-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 706f17c35f5d0680abac08a1d86bd3206342e266e40a4fefb651c873979c39ba7a7e372086a6a50fd6eb9b23df2105d2f26afbe8f314697a70d98afbca318871 SHA512 95e1cff9aeb49e3cda09a6068e2a863ec188220ca9326ab82e72a0ffba1b2419572983183ba404c0876a8459b05300908806ca7ba769c420516516c4eb41d201
 DIST rust-1.50.0-powerpc-unknown-linux-gnu.tar.xz 168133824 BLAKE2B d2ce955ae8975d667c854fc1f8dab5de8b8a3ecf08e52dab57f40f5a036138b6006554f053616c7d369e054f9ba3dbc502b2fa47ff0463e077f831f75b831c4f SHA512 1411063401432b2aed58f53c7e9c87d70177cb7745753378df052676a6b0ee19bf7e56298584356b77707758ad531e5d4d59140cd6e686bd7cee53488553214a
+DIST rust-1.50.0-powerpc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 786dac9a6fb19d30dfd4b2926e4992685ed17a0f247aefc54fc99ee2a49a74177f327142ea18e5e324f9fb33f2eb482cdad50c55f0a5eb886ba4c76f4742b67d SHA512 589a2999ee8c7ab4e809a299ab4b50b9bd52a5fd34ff8e1a0f1c187a9b7e31b73f376b08ff5a1a30a819457adb73d5504bc52ecd0f50b49bf9f0dd9dbd60bcb9
 DIST rust-1.50.0-powerpc64-unknown-linux-gnu.tar.xz 180157804 BLAKE2B 8d3c38cdea4901f38665e66f880301c409d0de4ade5fd931c834680ee21d014fe6efb6928a417bcc747ac10ceeabccf287c0a29c009525e2d2fec92db60bad01 SHA512 d60fa7d029c52403c08722b4cdda8ebcfbbf23f57770db786007b21c8e0590577f58823b8e0b89adb38c351102b6aba0c02afa5c3582eecec5165bccb50b4944
+DIST rust-1.50.0-powerpc64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 74a45316f3ad5924db4f9c714d25e0f4ce3e94bc022544f238a32417f3d4f43327402d404bd96675d60779c12968a6cfc3b837804772de000048a808b82ff676 SHA512 74e9663e347376819318aa2faf53e20d85aa2879ff88d94f64f8d01a278c2d7f051e1a31300142c02a049f4f0ad4cff2f2dc944a3ed3436283cfd00b5238ead2
 DIST rust-1.50.0-powerpc64le-unknown-linux-gnu.tar.xz 189754060 BLAKE2B 8579349a7d916ee701f29bd66d08a76d8433ad86020571e5484edbc8d9a984088e6942e31b18179698a199ade2fcee3b1b9aed1cc0d5a3b996e763ef2b8e0b33 SHA512 e3dc75ba7dff3a358042542afa398ec8771a23f5f699454a876ddc1f3583d399fe5350696a5da62d71ca97ea882c9ae1fcb60dc2e9fdf76bc7a9af892096371e
+DIST rust-1.50.0-powerpc64le-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B ed68b9dd309bcc4d575374a3eab6e96f5625dd84fee58abc6fffa4aa37b2b51010cf8c9d638d2b16b92ba7d4c80e238c4a788a800adef5da90a9ed337ed6898d SHA512 e6569a50256f30a1f91233fc855f8b8d03a8a1f75f583a4260a8f18acff7e2ef8c355775525aeeaf28ba33684a9636926ce0d6f4e542933ba0ddafb1e839654f
 DIST rust-1.50.0-s390x-unknown-linux-gnu.tar.xz 190157972 BLAKE2B 4fe8ec73293815ade006e2c383d1a6d541d87d4ebba76b3ace65793f7debfd54d3dc07cac89c43e41947f8d0b69bd0f213dbdca8173f610ca2da03bccdd55ddd SHA512 733513af2a7ef7a782a5ebfbd080071194ac47084022b54b4830de84facef9986d65525f8666a4c226e9878e43b00ebced26d6077e5fb1b7f775ac8f290fba97
+DIST rust-1.50.0-s390x-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 034daffe5d8df69e5cff8d4ba58e8c8d1540ff3bda07c816871e272a3bd6764ba4b8300cca96cdec3bf1b2994cb9111f4d79682561c6f9de1293f58e1e59449c SHA512 3c4f2aeb8533616148e11c7250396cd2c113b0a0725889b9bc8e9a5d4d1069c26852e4aa0b69887bbc2b42c2145a3faf8047bc7b1e24ceb76c88b7c288529dc3
 DIST rust-1.50.0-x86_64-unknown-linux-gnu.tar.xz 152873328 BLAKE2B b0bb91487186f13a7a1a49edeac28bc347c300911f574aba0e70c37e05b688176f5941c97cc4ad0ceddf32f2fbc0bdda6f8a1fdfa482aeb9682ea1fade28206e SHA512 ab49e3ecb14e4af8e48548845184e9ab3d564ab2341c1e5462b7847347c79d13324211b860988d219ccb646143bf142fb14c3ab03663b06cfe9ca275128d9fa0
+DIST rust-1.50.0-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 681ddf4d3d0c4a3e30a288835d8ab1238e5b9184526f1f61c52547f7122055be20b13595347937945a215d1d81e95c1adfbf89034123f5f66949b446bcc44434 SHA512 b512f9a7d0b53f058ba0766c241b60fab2d313b2462348747e7dd7ac52e9ca41487344a7bbb7f6dd3342737908b48ebfd367b563714108d7beeabb8fecc4eca8
 DIST rust-1.50.0-x86_64-unknown-linux-musl.tar.xz 242743828 BLAKE2B f20feb709cc07ad43f69e30a7fcefa81b5de94ee4c90cbce2616fcda8af2591a27cfa0770b71138762e21f6e07263bf3c2548bcce1b707831ab544de12ab746a SHA512 68403236e213a4f2c156b36a03ca4dd7866fdb69e87170efc76426d937dcf5cf2c5578aaf73483131b1ce7750302f9d02de1bcbc52e1283b08220d5b22be82ca
+DIST rust-1.50.0-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B d26d5e5f536b0e6ba0b87d97a1975e0e8245309e013fafba9be466da6c599bd7149c2a726b8bd7ac93b44511ead18deb99321dabdfccb95dd06d6adb71397c1a SHA512 1a0b4c40caafb6ca88d4679779cd80d4c334e5262952b13ce4b9fd34ba1258c15f421ac9920e81874d071f53bf14e9307f00bebdf42494bfeb2a504ff5f1b6c3
+DIST rust-1.51.0-aarch64-unknown-linux-gnu.tar.xz 208849064 BLAKE2B 1570536f63237ce04222f78c8c1d0592b3d0bacb62e2a1e2b87f9cd74c8d304837f9259c154e6ddfc5d0fc36c1d69aba34cb27d41346d4e7400ad1950ff19f8f SHA512 2af31290e1065a4611f34e6cc8c62ee494c222becfb21ec6707059c119069b0adf0eec23e56bad4a3cc8690b2556309ec58cbd9003a959983689cc46c7c63361
+DIST rust-1.51.0-aarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B cc2cef574740ea5eb632235dca2889a7c6a6941169ac011d3a888cdefb8e5a5af5bb9ade93207ccb6adc82eb6ae1b5ed605954cea2561163c538fcbbcdb647f8 SHA512 43abb6e19c1ca905cb2d047503f4473584e06b8daecff3b6e45ac93dadc2c7f37118e3b66124180a9951b2f5eedf212174a37c661a7775600bd200eb089801f9
+DIST rust-1.51.0-aarch64-unknown-linux-musl.tar.xz 209607568 BLAKE2B 8a8d677fac5aa68be8b689bd999894f0b51910d50d86d70db4cc9b60695703dd74b68578b72d9d410d2d163aebd3fbab0993ebf79486a103ef588cb849dc2038 SHA512 d7ca480f4e07f88a49b475d2fcd132126defff21c26a665d1b444b97ce5e44404f9106bb844a5e35d4933a51c2d8a5aabc8ee42a2515c02a559c81937920be4d
+DIST rust-1.51.0-aarch64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 0759b58a1647b0c0a29fc295edb31e793a0688d6a4b6eb8febe4364421f53cd1f4c0555abf7c8d4fb25bd7c15c9aeaa8d520390d8d3b61c213a591ccee7b9887 SHA512 bc2135b94f9c4e7b2616d886e84a268f52404abed2b827bdca5ab8f98071801e171234f18aa27a367b5dbd0df0e207b0aac8a30be59fff807ff70f21279614e2
+DIST rust-1.51.0-arm-unknown-linux-gnueabi.tar.xz 194362256 BLAKE2B 20c1559d3b1f32c9ca6f5e9740dff0d9fd859be33ca58d59733fff1566ed0b75dd398facbcd15c8d7c862bee945198b0235973d5f683fd78f82cca52429b269c SHA512 fadb5084152b6fa148c1d584c8ba766201012c0a70bdf273f5d4b89b249d7f520997b12809a0db68c9d1d76283fee892f83b6ef687cbb025c08960ffff7e5eea
+DIST rust-1.51.0-arm-unknown-linux-gnueabi.tar.xz.asc 801 BLAKE2B 546fad9428e7261ef78e92d6542ebcd2b1b11c54bb4dc1fbcb7ca622551e6b4fc443f16305f9f37572ff2f24e5dfab491fadf3a128e009c77aa0218b271bbe5e SHA512 580954dde6e5a89a9a16d0b93570275e81f488f0a77952cd4e3878894f9865f2a128bac2aaf0567ffc9e7cf9809808088a819bf7b0e54d8fa6224abe677d1732
+DIST rust-1.51.0-arm-unknown-linux-gnueabihf.tar.xz 193918308 BLAKE2B 6799652205422d96c95949a4afa8a321a8a4e0cd42543f321898fdba5b27bb645f9eeb50edb63a43902cc74026a786c12a22af67313bc6ac0843b1e638077d64 SHA512 cd0dba1ebdff9692aef0026d94da38ba7856b64004404b75d0d385b8f9f53eed1ddd0e900e49cda60fc5190fe305d96f6f00d0053f4409479ab991fafa90338c
+DIST rust-1.51.0-arm-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 41cad50cdebc0cb4e59f6c914b30b071dd7a70b6278c03a7349eb51a9ec6976fbaeacaea96f13e8ad91a283a3de4f548cf8e352179359f5697520813bc47e274 SHA512 d74a183dba390ea053ee746575788481e3970572e61b7b55acff521c8f4a9da5a3f4e3feff5c3b26162acdc00eed1c4240a4fbdcac3fa117455ac49d8ce62985
+DIST rust-1.51.0-armv7-unknown-linux-gnueabihf.tar.xz 197028040 BLAKE2B 801526d0fc9cdfc25a63227afdfc1bf9e0e6fa0b80f6306d86b68ca16adf4996b755b6ade1a4e898bfaf25565b5b49a358a9ed364bfe5d67c308744814a843de SHA512 c602dcc7fd1343b310f5e3074bf63f2428ca7c15cdce8999fa4655de5a4bda5a13255fc12bee3d0632f6cb93220a883fb36d24061dca6795d23afa9f8fdae57f
+DIST rust-1.51.0-armv7-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B dd94fb91fb6dba9788b178ea74b73c0df78f496d6f57382969836ade9aacda1696f363c4cef8126426040620ef934a2f2681d89d5e3a703d9114d8d152abb6f8 SHA512 40a3f61341ec996650b6e4e8552007b822b7990b2154483a7d7a7dcbae4eb2913d4ffb5319037256ff5931ee01320d1c3ce307aa7c9fd90a782646de4edcd2e9
+DIST rust-1.51.0-i686-unknown-linux-gnu.tar.xz 213348860 BLAKE2B bd6c1d5ce9f20b961e3db8c69b022402acbdf06029e0802863292bcac89b0f88e6e6d02f625be52e8753d772aad8ac01125ff6832072b5d3d41a9ec7bf5c6a6f SHA512 05d08e44827dcba8197667deb9a7f3584465085ce1b79a38deb138849a07c716646a70f1cc2cee02b41c45ec7c3a3b7800a3fae62ebe04d6f72f017a5d722bab
+DIST rust-1.51.0-i686-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B c09c5ce8df8834758cf8049872142104023af24f31a2efc97ee201e6b2db56c1b7dd1baccd608ca1f3de416efd162408a01170fff9b7070cac80df32fa30012d SHA512 6aad34b773cfe0ec30f80dacb7482247515ed1e7025a322d22ce7a2b1a6dc49929f71b9c3a6bd05622b70dd8f37fde5cc809ac32c4724b98098630158dddcfdf
+DIST rust-1.51.0-mips-unknown-linux-gnu.tar.xz 155944968 BLAKE2B ab9ad78f147b439beec9e92e643cc48814666c5e8fa244981d0919237844006aa2879a4058145d0bdafe89793402e65982d9fd3f0c6253f6a1805bf3381b4caf SHA512 378cfacfc66f1e8a4aeeb3715db9d3cefb4582db8a3b8fc62f05ac50a16db302b250c1696605c17cebe75923010b361b3a9883f7567a26cdcd60fc8379d2d7b3
+DIST rust-1.51.0-mips-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B d072b66f210244c3cb534a040679ee5c5433703fe309a05565a91b4cc8fd50b0e09320067dc48a7255aa0561ca6029fcab3ef4b782f40097a9646c5c77727344 SHA512 c7f1789e577c89397c59e288d2351fdb08bb9626df9d2a4d15c13a1474b67f8474be27d9f8a13fb55c53f9a17e47825b84473f487fa3866a8e30e4141b26aaa6
+DIST rust-1.51.0-mips64-unknown-linux-gnuabi64.tar.xz 161859704 BLAKE2B a60484b7d009633763f10be8affc33715992f6eee5643d147078840675c900be0ff7f9bd985680836dc7d8467d7d118863cb5bed0f85bb135f0e352318946f32 SHA512 e99437a1b79e8821f6c1eaea92a8c5348e6fb4aa1a4fecbfecc950bf71fd7cd58712d336a67e00f95554bb01565f1daa1221699e142e9e673d8ce2cbb8910008
+DIST rust-1.51.0-mips64-unknown-linux-gnuabi64.tar.xz.asc 801 BLAKE2B 85aca04845291448d9ec9c5b37f556e890155574982496d8967829b56b3c4caab1aa40c71e007392a05337ca917a70aa107007cf5c73c8eb8fa95bbcb6f7debf SHA512 4ebd8e0bad5c66a12bfb606f6b28aa63430af5e6344ce91d2be958f1f479fad0d5af6a53006999a321cacfea50fc623629f633f95ff747790c2702aa8dfe9c76
+DIST rust-1.51.0-mipsel-unknown-linux-gnu.tar.xz 159164156 BLAKE2B ccccc1e8abf529f9f023cd793dd78c9bfece359a770e03cfae808ac017ae0171ca0dbabb870c5ad57670a9ec562c393d2ffef3490e46423420be6a9a20cc8937 SHA512 31aecea3016e30dd610b610b86ec23f9832061abfbc55c7e43d942d4b0e8e521aecb37306bdb4a810ddcfc4e9d9a6cf057d6802d053ce9abf1cad401b6440d67
+DIST rust-1.51.0-mipsel-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B e61e17518d7d326f188b84855b771c7bc2d7f23347dfadaf0783b4fcbb7dfd233ed2262c6ffa75b55baee7e83e94b5c47d24b937e540c6a2892b20d320fcefbb SHA512 e0ffb031f600a58a2f7a76b1b26f5453e9de4d4edf6652d75d0cdd92e4495844601d56b521482e172c72b7463ab667ea65e610baa4f68c5f59333dd8f3cf1155
+DIST rust-1.51.0-powerpc-unknown-linux-gnu.tar.xz 167534676 BLAKE2B 5c74ebaf5d5e736bbfb8d963faff6d0fa5725017c738c4a5adf4b4e8c812ff8234b9e03e1a6ba2b6ab718469541e8c398e095ae22f155ccf9290e50ae0595a52 SHA512 9984e464a4e7d18042a8a2d99d26c4436a0ae2b2d281d5c8a42aedb0b78ab5e72f2392ea96e84b2f5892d772d28ee2feb89636f8d1a060a30098faa4e7f259eb
+DIST rust-1.51.0-powerpc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B c8ee6ea39b19cb160527145aeb32206eef6665df1e2c3ce690a136ead20b8114a5806b209a926da7608ffce94e6d65910b7a282cb353345a83a8e2b589df489f SHA512 886c62e4592568ad7b966f933641236ce59a037b65a00e0bfab6d2d6bb62cf994cdd8e392dd2f51b9c958e4e3c0c3763b9dec6be5a4faf27aac5d8d0a225abe2
+DIST rust-1.51.0-powerpc64-unknown-linux-gnu.tar.xz 182726600 BLAKE2B d9051eea2d9486b6b4d858a3f6730210de5aac958853de82b3f822b3e0decd1b8a9a9b371b250ffde9ac19be4ccbe09e58c51a78b7e1fb2dd48e61c8a902e5b5 SHA512 4c1864a81d4c32bd95e0381454beae2a1d5b4cb47196821e64fc261133acfa2fa1e514dd6cdb68551559c4da2a2483edf5c6c14246adbea85c3027f88d401e06
+DIST rust-1.51.0-powerpc64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B e1fe8c5764cb11f722893c7efcfb76d5f17ee80a104ede360fedbc8cd1e2996246e0a770959398a524ae55bdfb075dedb2c2583816bd3de28034dddbf248a54c SHA512 3b7e3f15f5a2a4876175a26d7b4332d4a6847a565d5de4c2cb67c52cf26308215286777ea9d89366543ddd1ce353d6a920153549b6641ffeae8e9954470aecfc
+DIST rust-1.51.0-powerpc64le-unknown-linux-gnu.tar.xz 192084372 BLAKE2B d127c1827956c7594da5b69346168504b22726e176f03172b599e0a0fae2400e273684090f1d0fd05c33f193b3918c98ccd64c3647b0577b51431c3409083b2f SHA512 b53a741d1d75637fb31ddb0364e1f91427c3818ca145f819b906d13c32c638ae77fbaa567a6220b6bf69f38cc00d2b95615778a86f4acadd63efe2e62b1b01ef
+DIST rust-1.51.0-powerpc64le-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B f79f8e1ad8cb0dbc6e1cb45fab2bd19a03d1939518529841155e7a00d9a42e3eb2539ae424c68af7140399a2b37c6ff5a00c55f0467ce4acf6fd7b1ddf525a63 SHA512 785ab118197d53b5f4512cdb07e6277c9ff58b9e53610dcce1c9f928cac8a20b1fbaaa7acad8cbe4370a3fe6dda5f726e8021e8987688a9ec242f73ed8d12adb
+DIST rust-1.51.0-s390x-unknown-linux-gnu.tar.xz 191632144 BLAKE2B d1690825f59e8ed1ed4855556ff36c05efbc941097744e31fd9207309087d53880d418f737aa0cb9371b973c9c3d56f05ed03533df04402242194ef13b8d608d SHA512 a72ad31c6306f939c4f963133ddc0b3fabc9e506bdff5e318f5275658b7271a675a51d208d306d94fb01739cbcf0f62f018fc7490ca6db54b301852202749d16
+DIST rust-1.51.0-s390x-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 355e753ddca453ca36a8c1e4f361e9655bdb54f856a642be3d4024772266ed1771a2673ab1026c64bbf7ac8d1fc30fb1924a939cc3ea290e98b137edb48bbf6a SHA512 89bf145b8e620eac99b0fe4a79ee205a04550c664bba1e22a7611ef37736cca3cb911ac89659126e0c6fa60e4dbfdf0dd54a8693e496d4c37e4f7d3f518e2740
+DIST rust-1.51.0-x86_64-unknown-linux-gnu.tar.xz 147543532 BLAKE2B 44ac97f6b650e65de257b362121091176e02fac60aa534ec83ddbc4e16eb32f7a4a7999cc28eac446f5790572552fee5c2589350cb6d159a946d90007d85c7db SHA512 9f95045119bcd5ef7be54f5b5bdc9ebc6bd6c48437d90762a1cfbc03281882f81087e1877eecae9573ba5e7cd7c11ef5fed979034c57f45b6547cbfeb11eef6d
+DIST rust-1.51.0-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 033c41c165cf50a63479d1352a33abe94a63d9730f02016d09bf2e8a8804587d4fc802c047e7417e0befca2d5df5ca8c79a714ec1c1fb389240b6e8931fb9e9b SHA512 e314a7db9aaff445b67f828bf9a98705032071928e2102524c0c720a3b8feb292b8c6766838b92da2d213e93bf53fb780fc856b0370238fbb7e20431d2de6d5c
+DIST rust-1.51.0-x86_64-unknown-linux-musl.tar.xz 233773068 BLAKE2B cc9de90b967cc81005ce5c897d3fd6dc4e3880be96ac82c41382d19a8aca0244845830db7a33eaef85b6bdef0c00ae02c0390db932fa49f76e362af2c68edb56 SHA512 d8df3c4c3de435629986e21bc6b31edfb73cba394e76cf87ee98d2936f73aef60c988d020da7ec1188f6448eacad9d5aefed073f4f88ffa2eaac54ac7e3cb3f7
+DIST rust-1.51.0-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 2e2c20fe99b33e5361b1945f54b77d5e8acad34d1be9cadfd1971b2882e38bc4403a5a67769a74fdd7ab21434784f03084780ef827e26318168bf5d531f9e9bd SHA512 42392e8283a28d58d4874dbf97caa0377f27c6599c272c715fcdefee48551004d491f0509f2894f5696a2820f11dbb333e3bf878cbdf24b0c58add4a493acecc
 DIST rustc-1.51.0-src.tar.xz 109596164 BLAKE2B c1ac89655adfe7db8005476d42c748cf1896f52888141229fd6dda43855dbb08c21c8e1f11398d2f1f9dd5f8d508d9158a3bda4f1b282d1b184ea4c701100837 SHA512 ded91468ddf3e6627f00e7ec3d44452aa24eb727a183c0de9d90264f593119a54300d56b09251a88260db480b48554181ae195c538996a32d68d48b6587ac0df
-EBUILD rust-1.51.0-r2.ebuild 19348 BLAKE2B b7dc3411ce5a123be2d7a8588ea6974474e4693d70c70d1776253ec790557d0f5cddc295d9028ffedbffa94844adb3d56d0edcfee9c8e8774e642f3eb71d79db SHA512 1e408b940cc91abf0e8e0cbce3c8a2a5f8f1560671807180b75c7a92455f1b8670e3a33ec7c6359d534b809d0fbc75cb8cd6b6a5e2677d39182c02968eb1a02b
+DIST rustc-1.51.0-src.tar.xz.asc 801 BLAKE2B dc06d0bc40bcc5ec5ae247495b6975584a80a35480d36d45db4db57872432cc9c3d38238bf68a56386bffc6987f5c491cc75ef21cc7ba9260073c199d7e1791a SHA512 f00d69117e9f38a179219f976230582fc51b494a71519fd3c032a8abdf8d554d659122f671881783f2a49517b79cc4617986447d5972f7ff2467d56fce312c4c
+DIST rustc-1.52.0-src.tar.xz 115114564 BLAKE2B 47270ff677af5d3f58b4d5dbc3bd981326f3e40689fd427508d2c1b13b6e6bbbba1c645a82cd7f783caf876d4405302b236f70e158fda2ecd215da4aba36292b SHA512 27e18e5f33b67b85eeda1a747846b4839e3891265b4a9356861a1ed628e84ff723be0df470a6f21e7a1e893f348c38a4df5d1c541640a2699e015bdb622cae83
+DIST rustc-1.52.0-src.tar.xz.asc 801 BLAKE2B 785a1f037e116df3010eb77ce6cd0ef187a2f0caadd91cdd0bacfde435e9864fb1d3cfe8117ce7b6e35869a830e17ff5673c517393ed42e0d110d4c28c15d005 SHA512 56809ca28eb640b606753aef7a335362c592cb405fca7bdba74ff08616e8a72cd8247bd7318217d644d68c7030c45369b5ca186a1cba4fcb48aa6efff002a67f
+EBUILD rust-1.51.0-r2.ebuild 19778 BLAKE2B 18c54ae6fb290f4774edab91fd279746ad7f3c5a6928d9cc8924cf6f8f15c1b9e369659401610a29b48bc0a689303282ffc649c0c4490a892f7720743c85243c SHA512 6bc80c4a17ced13cdd6c541898951767fad2e1fb8ee5ae2b91f68fbb1bd8afbcfaba8b319c96bbce75a9c4918c22ef9361c6e6bc5da8e3e04d19ebcdecfbc17c
+EBUILD rust-1.52.0.ebuild 19755 BLAKE2B 86e3e6028ae0dacde0cee1120837dd83d7d9f7b453f2b2a9153581d8ebd14deeda943774bac3873a73a8999f3b0f6059c78c18934dd1cdf097ace00118554f21 SHA512 24c5ce7871e108f1bc18c3c0d11ce609bd69d4a4d149fd1ede47686af4dfa27dc19d2405eb277348129d3aa33dab79dc86d986ef80297a247ea54a5e392555d3
 MISC metadata.xml 1083 BLAKE2B 7a7b093c22dcaef58bd67f9c2fd84a000696b234d2bc27315999bf6751cfd2a79441fd22efc284a542ecc84ce1a12ff9ca3495d249eaffa5bc1722b385c6109e SHA512 bfe8c140753e93db67244c92e9a7d193691ceb67de796c30a851966a1262bc5c897ead6e13d728775fa524215b6851609dcbee582022d9d75bb8d1e6fabc4ef4
diff --git a/dev-lang/rust/files/1.51.0-slow-doc-install.patch b/dev-lang/rust/files/1.51.0-slow-doc-install.patch
new file mode 100644
index 000000000000..4aa7a714795f
--- /dev/null
+++ b/dev-lang/rust/files/1.51.0-slow-doc-install.patch
@@ -0,0 +1,92 @@
+From 6dfd700c595a8853fd58349c38c4768b922a2e85 Mon Sep 17 00:00:00 2001
+From: Anders Kaseorg <andersk@mit.edu>
+Date: Sat, 17 Apr 2021 22:20:36 -0700
+Subject: [PATCH] bootstrap: Restore missing --bulk-dirs for rust-docs,
+ rustc-docs
+
+The --bulk-dirs argument was removed for rust-docs in commit
+c768ce138427b1844c1f6594daba9c0e33928032 and rustc-docs in commit
+8ca46fc7a83734c9622f11f25d16b82316f44bcc (#79788), presumably by
+mistake; that slowed down installation of rust-docs from under a
+second to some twenty *minutes*.  Restoring --bulk-dirs reverses this
+slowdown.
+
+Fixes #80684.
+
+Signed-off-by: Anders Kaseorg <andersk@mit.edu>
+---
+ src/bootstrap/dist.rs    |  4 ++--
+ src/bootstrap/tarball.rs | 17 +++++++++++++++++
+ 2 files changed, 19 insertions(+), 2 deletions(-)
+
+diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs
+index 38ebe0e52083d..aee3c8324bc11 100644
+--- a/src/bootstrap/dist.rs
++++ b/src/bootstrap/dist.rs
+@@ -74,7 +74,7 @@ impl Step for Docs {
+ 
+         let mut tarball = Tarball::new(builder, "rust-docs", &host.triple);
+         tarball.set_product_name("Rust Documentation");
+-        tarball.add_dir(&builder.doc_out(host), dest);
++        tarball.add_bulk_dir(&builder.doc_out(host), dest);
+         tarball.add_file(&builder.src.join("src/doc/robots.txt"), dest, 0o644);
+         Some(tarball.generate())
+     }
+@@ -107,7 +107,7 @@ impl Step for RustcDocs {
+ 
+         let mut tarball = Tarball::new(builder, "rustc-docs", &host.triple);
+         tarball.set_product_name("Rustc Documentation");
+-        tarball.add_dir(&builder.compiler_doc_out(host), "share/doc/rust/html/rustc");
++        tarball.add_bulk_dir(&builder.compiler_doc_out(host), "share/doc/rust/html/rustc");
+         Some(tarball.generate())
+     }
+ }
+diff --git a/src/bootstrap/tarball.rs b/src/bootstrap/tarball.rs
+index b02d7e062a524..9ff5c2327e0f7 100644
+--- a/src/bootstrap/tarball.rs
++++ b/src/bootstrap/tarball.rs
+@@ -99,6 +99,7 @@ pub(crate) struct Tarball<'a> {
+     temp_dir: PathBuf,
+     image_dir: PathBuf,
+     overlay_dir: PathBuf,
++    bulk_dirs: Vec<PathBuf>,
+ 
+     include_target_in_component_name: bool,
+     is_preview: bool,
+@@ -137,6 +138,7 @@ impl<'a> Tarball<'a> {
+             temp_dir,
+             image_dir,
+             overlay_dir,
++            bulk_dirs: Vec::new(),
+ 
+             include_target_in_component_name: false,
+             is_preview: false,
+@@ -201,6 +203,11 @@ impl<'a> Tarball<'a> {
+         self.builder.cp_r(src.as_ref(), &dest);
+     }
+ 
++    pub(crate) fn add_bulk_dir(&mut self, src: impl AsRef<Path>, dest: impl AsRef<Path>) {
++        self.bulk_dirs.push(dest.as_ref().to_path_buf());
++        self.add_dir(src, dest);
++    }
++
+     pub(crate) fn generate(self) -> GeneratedTarball {
+         let mut component_name = self.component.clone();
+         if self.is_preview {
+@@ -221,6 +228,16 @@ impl<'a> Tarball<'a> {
+                 .arg("--image-dir")
+                 .arg(&this.image_dir)
+                 .arg(format!("--component-name={}", &component_name));
++
++            if let Some((dir, dirs)) = this.bulk_dirs.split_first() {
++                let mut arg = dir.as_os_str().to_os_string();
++                for dir in dirs {
++                    arg.push(",");
++                    arg.push(dir);
++                }
++                cmd.arg("--bulk-dirs").arg(&arg);
++            }
++
+             this.non_bare_args(cmd);
+         })
+     }
diff --git a/dev-lang/rust/rust-1.51.0-r2.ebuild b/dev-lang/rust/rust-1.51.0-r2.ebuild
index 66e329742038..926ebd4628c4 100644
--- a/dev-lang/rust/rust-1.51.0-r2.ebuild
+++ b/dev-lang/rust/rust-1.51.0-r2.ebuild
@@ -5,7 +5,8 @@ EAPI=7
 
 PYTHON_COMPAT=( python3_{7..9} )
 
-inherit bash-completion-r1 check-reqs estack flag-o-matic llvm multiprocessing multilib-build python-any-r1 rust-toolchain toolchain-funcs
+inherit bash-completion-r1 check-reqs estack flag-o-matic llvm multiprocessing \
+	multilib-build python-any-r1 rust-toolchain toolchain-funcs verify-sig
 
 if [[ ${PV} = *beta* ]]; then
 	betaver=${PV//*beta}
@@ -28,6 +29,7 @@ HOMEPAGE="https://www.rust-lang.org/"
 
 SRC_URI="
 	https://static.rust-lang.org/dist/${SRC}
+	verify-sig? ( https://static.rust-lang.org/dist/${SRC}.asc )
 	!system-bootstrap? ( $(rust_all_arch_uris rust-${RUST_STAGE0_VERSION}) )
 "
 
@@ -93,6 +95,7 @@ BDEPEND="${PYTHON_DEPS}
 		dev-util/ninja
 	)
 	test? ( sys-devel/gdb )
+	verify-sig? ( app-crypt/openpgp-keys-rust )
 "
 
 DEPEND="
@@ -138,10 +141,13 @@ QA_SONAME="
 # causes double bootstrap
 RESTRICT="test"
 
+VERIFY_SIG_OPENPGP_KEY_PATH="/usr/share/openpgp-keys/rust.asc"
+
 PATCHES=(
 	"${FILESDIR}"/1.47.0-ignore-broken-and-non-applicable-tests.patch
 	"${FILESDIR}"/1.49.0-gentoo-musl-target-specs.patch
 	"${FILESDIR}"/1.51.0-bootstrap-panic.patch
+	"${FILESDIR}"/1.51.0-slow-doc-install.patch
 	"${FILESDIR}"/rustc-1.51.0-backport-pr81728.patch
 	"${FILESDIR}"/rustc-1.51.0-backport-pr81741.patch
 	"${FILESDIR}"/rustc-1.51.0-backport-pr82289.patch
@@ -463,8 +469,15 @@ src_configure() {
 	done
 	fi # I_KNOW_WHAT_I_AM_DOING_CROSS
 
-	einfo "Rust configured with the following settings:"
+	einfo "Rust configured with the following flags:"
+
+	echo "RUSTFLAGS=\"${RUSTFLAGS:-}\""
+	echo "RUSTFLAGS_BOOTSTRAP=\"${RUSTFLAGS_BOOTSTRAP:-}\""
+	echo "RUSTFLAGS_NOT_BOOTSTRAP=\"${RUSTFLAGS_NOT_BOOTSTRAP:-}\""
+	echo
+	einfo "config.toml contents:"
 	cat "${S}"/config.toml || die
+	echo
 }
 
 src_compile() {
diff --git a/dev-lang/rust/rust-1.52.0.ebuild b/dev-lang/rust/rust-1.52.0.ebuild
new file mode 100644
index 000000000000..1e678c766584
--- /dev/null
+++ b/dev-lang/rust/rust-1.52.0.ebuild
@@ -0,0 +1,662 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_{7..9} )
+
+inherit bash-completion-r1 check-reqs estack flag-o-matic llvm multiprocessing \
+	multilib-build python-any-r1 rust-toolchain toolchain-funcs verify-sig
+
+if [[ ${PV} = *beta* ]]; then
+	betaver=${PV//*beta}
+	BETA_SNAPSHOT="${betaver:0:4}-${betaver:4:2}-${betaver:6:2}"
+	MY_P="rustc-beta"
+	SLOT="beta/${PV}"
+	SRC="${BETA_SNAPSHOT}/rustc-beta-src.tar.xz -> rustc-${PV}-src.tar.xz"
+else
+	ABI_VER="$(ver_cut 1-2)"
+	SLOT="stable/${ABI_VER}"
+	MY_P="rustc-${PV}"
+	SRC="${MY_P}-src.tar.xz"
+	KEYWORDS="~amd64 ~arm ~arm64 ~ppc64 ~x86"
+fi
+
+RUST_STAGE0_VERSION="1.$(($(ver_cut 2) - 1)).0"
+
+DESCRIPTION="Systems programming language from Mozilla"
+HOMEPAGE="https://www.rust-lang.org/"
+
+SRC_URI="
+	https://static.rust-lang.org/dist/${SRC}
+	verify-sig? ( https://static.rust-lang.org/dist/${SRC}.asc )
+	!system-bootstrap? ( $(rust_all_arch_uris rust-${RUST_STAGE0_VERSION}) )
+"
+
+# keep in sync with llvm ebuild of the same version as bundled one.
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARM AVR BPF Hexagon Lanai Mips MSP430
+	NVPTX PowerPC RISCV Sparc SystemZ WebAssembly X86 XCore )
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+LLVM_TARGET_USEDEPS=${ALL_LLVM_TARGETS[@]/%/(-)?}
+
+LICENSE="|| ( MIT Apache-2.0 ) BSD-1 BSD-2 BSD-4 UoI-NCSA"
+
+IUSE="clippy cpu_flags_x86_sse2 debug doc miri nightly parallel-compiler rls rustfmt system-bootstrap system-llvm test wasm ${ALL_LLVM_TARGETS[*]}"
+
+# Please keep the LLVM dependency block separate. Since LLVM is slotted,
+# we need to *really* make sure we're not pulling more than one slot
+# simultaneously.
+
+# How to use it:
+# List all the working slots in LLVM_VALID_SLOTS, newest first.
+LLVM_VALID_SLOTS=( 12 )
+LLVM_MAX_SLOT="${LLVM_VALID_SLOTS[0]}"
+
+# splitting usedeps needed to avoid CI/pkgcheck's UncheckableDep limitation
+# (-) usedep needed because we may build with older llvm without that target
+LLVM_DEPEND="|| ( "
+for _s in ${LLVM_VALID_SLOTS[@]}; do
+	LLVM_DEPEND+=" ( "
+	for _x in ${ALL_LLVM_TARGETS[@]}; do
+		LLVM_DEPEND+="
+			${_x}? ( sys-devel/llvm:${_s}[${_x}(-)] )"
+	done
+	LLVM_DEPEND+=" )"
+done
+unset _s _x
+LLVM_DEPEND+=" )
+	<sys-devel/llvm-$(( LLVM_MAX_SLOT + 1 )):=
+	wasm? ( sys-devel/lld )
+"
+
+# to bootstrap we need at least exactly previous version, or same.
+# most of the time previous versions fail to bootstrap with newer
+# for example 1.47.x, requires at least 1.46.x, 1.47.x is ok,
+# but it fails to bootstrap with 1.48.x
+# https://github.com/rust-lang/rust/blob/${PV}/src/stage0.txt
+BOOTSTRAP_DEPEND="||
+	(
+		=dev-lang/rust-$(ver_cut 1).$(($(ver_cut 2) - 1))*
+		=dev-lang/rust-bin-$(ver_cut 1).$(($(ver_cut 2) - 1))*
+		=dev-lang/rust-$(ver_cut 1).$(ver_cut 2)*
+		=dev-lang/rust-bin-$(ver_cut 1).$(ver_cut 2)*
+	)
+"
+
+BDEPEND="${PYTHON_DEPS}
+	app-eselect/eselect-rust
+	|| (
+		>=sys-devel/gcc-4.7
+		>=sys-devel/clang-3.5
+	)
+	system-bootstrap? ( ${BOOTSTRAP_DEPEND} )
+	!system-llvm? (
+		dev-util/cmake
+		dev-util/ninja
+	)
+	test? ( sys-devel/gdb )
+	verify-sig? ( app-crypt/openpgp-keys-rust )
+"
+
+DEPEND="
+	>=app-arch/xz-utils-5.2
+	net-misc/curl:=[http2,ssl]
+	sys-libs/zlib:=
+	dev-libs/openssl:0=
+	elibc_musl? ( sys-libs/libunwind:= )
+	system-llvm? ( ${LLVM_DEPEND} )
+"
+
+# we need to block older versions due to layout changes.
+RDEPEND="${DEPEND}
+	app-eselect/eselect-rust
+	!<dev-lang/rust-1.47.0-r1
+	!<dev-lang/rust-bin-1.47.0-r1
+"
+
+REQUIRED_USE="|| ( ${ALL_LLVM_TARGETS[*]} )
+	miri? ( nightly )
+	parallel-compiler? ( nightly )
+	test? ( ${ALL_LLVM_TARGETS[*]} )
+	wasm? ( llvm_targets_WebAssembly )
+	x86? ( cpu_flags_x86_sse2 )
+"
+
+# we don't use cmake.eclass, but can get a warnings
+CMAKE_WARN_UNUSED_CLI=no
+
+QA_FLAGS_IGNORED="
+	usr/lib/${PN}/${PV}/bin/.*
+	usr/lib/${PN}/${PV}/libexec/.*
+	usr/lib/${PN}/${PV}/lib/lib.*.so
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/bin/.*
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/lib/lib.*.so
+"
+
+QA_SONAME="
+	usr/lib/${PN}/${PV}/lib/lib.*.so.*
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/lib/lib.*.so
+"
+
+# causes double bootstrap
+RESTRICT="test"
+
+VERIFY_SIG_OPENPGP_KEY_PATH="/usr/share/openpgp-keys/rust.asc"
+
+PATCHES=(
+	"${FILESDIR}"/1.47.0-ignore-broken-and-non-applicable-tests.patch
+	"${FILESDIR}"/1.49.0-gentoo-musl-target-specs.patch
+	"${FILESDIR}"/1.51.0-slow-doc-install.patch
+)
+
+S="${WORKDIR}/${MY_P}-src"
+
+toml_usex() {
+	usex "${1}" true false
+}
+
+boostrap_rust_version_check() {
+	# never call from pkg_pretend. eselect-rust may be not installed yet.
+	[[ ${MERGE_TYPE} == binary ]] && return
+	local rustc_wanted="$(ver_cut 1).$(($(ver_cut 2) - 1))"
+	local rustc_toonew="$(ver_cut 1).$(($(ver_cut 2) + 1))"
+	local rustc_version=( $(eselect --brief rust show 2>/dev/null) )
+	rustc_version=${rustc_version[0]#rust-bin-}
+	rustc_version=${rustc_version#rust-}
+
+	[[ -z "${rustc_version}" ]] && die "Failed to determine rust version, check 'eselect rust' output"
+
+	if ver_test "${rustc_version}" -lt "${rustc_wanted}" ; then
+		eerror "Rust >=${rustc_wanted} is required"
+		eerror "please run 'eselect rust' and set correct rust version"
+		die "selected rust version is too old"
+	elif ver_test "${rustc_version}" -ge "${rustc_toonew}" ; then
+		eerror "Rust <${rustc_toonew} is required"
+		eerror "please run 'eselect rust' and set correct rust version"
+		die "selected rust version is too new"
+	else
+		einfo "Using rust ${rustc_version} to build"
+	fi
+}
+
+pre_build_checks() {
+	local M=8192
+	# multiply requirements by 1.5 if we are doing x86-multilib
+	if use amd64; then
+		M=$(( $(usex abi_x86_32 15 10) * ${M} / 10 ))
+	fi
+	M=$(( $(usex clippy 128 0) + ${M} ))
+	M=$(( $(usex miri 128 0) + ${M} ))
+	M=$(( $(usex rls 512 0) + ${M} ))
+	M=$(( $(usex rustfmt 256 0) + ${M} ))
+	# add 2G if we compile llvm and 256M per llvm_target
+	if ! use system-llvm; then
+		M=$(( 2048 + ${M} ))
+		local ltarget
+		for ltarget in ${ALL_LLVM_TARGETS[@]}; do
+			M=$(( $(usex ${ltarget} 256 0) + ${M} ))
+		done
+	fi
+	M=$(( $(usex wasm 256 0) + ${M} ))
+	M=$(( $(usex debug 2 1) * ${M} ))
+	eshopts_push -s extglob
+	if is-flagq '-g?(gdb)?([1-9])'; then
+		M=$(( 15 * ${M} / 10 ))
+	fi
+	eshopts_pop
+	M=$(( $(usex system-bootstrap 0 1024) + ${M} ))
+	M=$(( $(usex doc 256 0) + ${M} ))
+	CHECKREQS_DISK_BUILD=${M}M check-reqs_pkg_${EBUILD_PHASE}
+}
+
+llvm_check_deps() {
+	has_version -r "sys-devel/llvm:${LLVM_SLOT}[${LLVM_TARGET_USEDEPS// /,}]"
+}
+
+pkg_pretend() {
+	pre_build_checks
+}
+
+pkg_setup() {
+	pre_build_checks
+	python-any-r1_pkg_setup
+
+	export LIBGIT2_NO_PKG_CONFIG=1 #749381
+
+	use system-bootstrap && boostrap_rust_version_check
+
+	if use system-llvm; then
+		llvm_pkg_setup
+
+		local llvm_config="$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+		export LLVM_LINK_SHARED=1
+		export RUSTFLAGS="${RUSTFLAGS} -Lnative=$("${llvm_config}" --libdir)"
+	fi
+}
+
+src_prepare() {
+	if ! use system-bootstrap; then
+		local rust_stage0_root="${WORKDIR}"/rust-stage0
+		local rust_stage0="rust-${RUST_STAGE0_VERSION}-$(rust_abi)"
+
+		"${WORKDIR}/${rust_stage0}"/install.sh --disable-ldconfig \
+			--without=rust-docs --destdir="${rust_stage0_root}" --prefix=/ || die
+	fi
+
+	default
+}
+
+src_configure() {
+	local rust_target="" rust_targets="" arch_cflags
+
+	# Collect rust target names to compile standard libs for all ABIs.
+	for v in $(multilib_get_enabled_abi_pairs); do
+		rust_targets="${rust_targets},\"$(rust_abi $(get_abi_CHOST ${v##*.}))\""
+	done
+	if use wasm; then
+		rust_targets="${rust_targets},\"wasm32-unknown-unknown\""
+		if use system-llvm; then
+			# un-hardcode rust-lld linker for this target
+			# https://bugs.gentoo.org/715348
+			sed -i '/linker:/ s/rust-lld/wasm-ld/' compiler/rustc_target/src/spec/wasm32_base.rs || die
+		fi
+	fi
+	rust_targets="${rust_targets#,}"
+
+	local tools="\"cargo\","
+	if use clippy; then
+		tools="\"clippy\",$tools"
+	fi
+	if use miri; then
+		tools="\"miri\",$tools"
+	fi
+	if use rls; then
+		tools="\"rls\",\"analysis\",\"src\",$tools"
+	fi
+	if use rustfmt; then
+		tools="\"rustfmt\",$tools"
+	fi
+
+	local rust_stage0_root
+	if use system-bootstrap; then
+		rust_stage0_root="$(rustc --print sysroot)"
+	else
+		rust_stage0_root="${WORKDIR}"/rust-stage0
+	fi
+
+	rust_target="$(rust_abi)"
+
+	cat <<- _EOF_ > "${S}"/config.toml
+		[llvm]
+		download-ci-llvm = false
+		optimize = $(toml_usex !debug)
+		release-debuginfo = $(toml_usex debug)
+		assertions = $(toml_usex debug)
+		ninja = true
+		targets = "${LLVM_TARGETS// /;}"
+		experimental-targets = ""
+		link-shared = $(toml_usex system-llvm)
+		[build]
+		build = "${rust_target}"
+		host = ["${rust_target}"]
+		target = [${rust_targets}]
+		cargo = "${rust_stage0_root}/bin/cargo"
+		rustc = "${rust_stage0_root}/bin/rustc"
+		rustfmt = "${rust_stage0_root}/bin/rustfmt"
+		docs = $(toml_usex doc)
+		compiler-docs = false
+		submodules = false
+		python = "${EPYTHON}"
+		locked-deps = true
+		vendor = true
+		extended = true
+		tools = [${tools}]
+		verbose = 2
+		sanitizers = false
+		profiler = false
+		cargo-native-static = false
+		[install]
+		prefix = "${EPREFIX}/usr/lib/${PN}/${PV}"
+		sysconfdir = "etc"
+		docdir = "share/doc/rust"
+		bindir = "bin"
+		libdir = "lib"
+		mandir = "share/man"
+		[rust]
+		# https://github.com/rust-lang/rust/issues/54872
+		codegen-units-std = 1
+		optimize = true
+		debug = $(toml_usex debug)
+		debug-assertions = $(toml_usex debug)
+		debug-assertions-std = $(toml_usex debug)
+		debuginfo-level = $(usex debug 2 0)
+		debuginfo-level-rustc = $(usex debug 2 0)
+		debuginfo-level-std = $(usex debug 2 0)
+		debuginfo-level-tools = $(usex debug 2 0)
+		debuginfo-level-tests = 0
+		backtrace = true
+		incremental = false
+		default-linker = "$(tc-getCC)"
+		parallel-compiler = $(toml_usex parallel-compiler)
+		channel = "$(usex nightly nightly stable)"
+		description = "gentoo"
+		rpath = false
+		verbose-tests = true
+		optimize-tests = $(toml_usex !debug)
+		codegen-tests = true
+		dist-src = false
+		remap-debuginfo = true
+		lld = $(usex system-llvm false $(toml_usex wasm))
+		# only deny warnings if doc+wasm are NOT requested, documenting stage0 wasm std fails without it
+		# https://github.com/rust-lang/rust/issues/74976
+		# https://github.com/rust-lang/rust/issues/76526
+		deny-warnings = $(usex wasm $(usex doc false true) true)
+		backtrace-on-ice = true
+		jemalloc = false
+		[dist]
+		src-tarball = false
+		compression-formats = ["gz"]
+	_EOF_
+
+	for v in $(multilib_get_enabled_abi_pairs); do
+		rust_target=$(rust_abi $(get_abi_CHOST ${v##*.}))
+		arch_cflags="$(get_abi_CFLAGS ${v##*.})"
+
+		cat <<- _EOF_ >> "${S}"/config.env
+			CFLAGS_${rust_target}=${arch_cflags}
+		_EOF_
+
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.${rust_target}]
+			cc = "$(tc-getBUILD_CC)"
+			cxx = "$(tc-getBUILD_CXX)"
+			linker = "$(tc-getCC)"
+			ar = "$(tc-getAR)"
+		_EOF_
+		# librustc_target/spec/linux_musl_base.rs sets base.crt_static_default = true;
+		if use elibc_musl; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				crt-static = false
+			_EOF_
+		fi
+		if use system-llvm; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				llvm-config = "$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+			_EOF_
+		fi
+	done
+	if use wasm; then
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.wasm32-unknown-unknown]
+			linker = "$(usex system-llvm lld rust-lld)"
+		_EOF_
+	fi
+
+	if [[ -n ${I_KNOW_WHAT_I_AM_DOING_CROSS} ]]; then # whitespace intentionally shifted below
+	# experimental cross support
+	# discussion: https://bugs.gentoo.org/679878
+	# TODO: c*flags, clang, system-llvm, cargo.eclass target support
+	# it would be much better if we could split out stdlib
+	# complilation to separate ebuild and abuse CATEGORY to
+	# just install to /usr/lib/rustlib/<target>
+
+	# extra targets defined as a bash array
+	# spec format:  <LLVM target>:<rust-target>:<CTARGET>
+	# best place would be /etc/portage/env/dev-lang/rust
+	# Example:
+	# RUST_CROSS_TARGETS=(
+	#	"AArch64:aarch64-unknown-linux-gnu:aarch64-unknown-linux-gnu"
+	# )
+	# no extra hand holding is done, no target transformations, all
+	# values are passed as-is with just basic checks, so it's up to user to supply correct values
+	# valid rust targets can be obtained with
+	# 	rustc --print target-list
+	# matching cross toolchain has to be installed
+	# matching LLVM_TARGET has to be enabled for both rust and llvm (if using system one)
+	# only gcc toolchains installed with crossdev are checked for now.
+
+	# BUG: we can't pass host flags to cross compiler, so just filter for now
+	# BUG: this should be more fine-grained.
+	filter-flags '-mcpu=*' '-march=*' '-mtune=*'
+
+	local cross_target_spec
+	for cross_target_spec in "${RUST_CROSS_TARGETS[@]}";do
+		# extracts first element form <LLVM target>:<rust-target>:<CTARGET>
+		local cross_llvm_target="${cross_target_spec%%:*}"
+		# extracts toolchain triples, <rust-target>:<CTARGET>
+		local cross_triples="${cross_target_spec#*:}"
+		# extracts first element after before : separator
+		local cross_rust_target="${cross_triples%%:*}"
+		# extracts last element after : separator
+		local cross_toolchain="${cross_triples##*:}"
+		use llvm_targets_${cross_llvm_target} || die "need llvm_targets_${cross_llvm_target} target enabled"
+		command -v ${cross_toolchain}-gcc > /dev/null 2>&1 || die "need ${cross_toolchain} cross toolchain"
+
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.${cross_rust_target}]
+			cc = "${cross_toolchain}-gcc"
+			cxx = "${cross_toolchain}-g++"
+			linker = "${cross_toolchain}-gcc"
+			ar = "${cross_toolchain}-ar"
+		_EOF_
+		if use system-llvm; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				llvm-config = "$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+			_EOF_
+		fi
+
+		# append cross target to "normal" target list
+		# example 'target = ["powerpc64le-unknown-linux-gnu"]'
+		# becomes 'target = ["powerpc64le-unknown-linux-gnu","aarch64-unknown-linux-gnu"]'
+
+		rust_targets="${rust_targets},\"${cross_rust_target}\""
+		sed -i "/^target = \[/ s#\[.*\]#\[${rust_targets}\]#" config.toml || die
+
+		ewarn
+		ewarn "Enabled ${cross_rust_target} rust target"
+		ewarn "Using ${cross_toolchain} cross toolchain"
+		ewarn
+		if ! has_version -b 'sys-devel/binutils[multitarget]' ; then
+			ewarn "'sys-devel/binutils[multitarget]' is not installed"
+			ewarn "'strip' will be unable to strip cross libraries"
+			ewarn "cross targets will be installed with full debug information"
+			ewarn "enable 'multitarget' USE flag for binutils to be able to strip object files"
+			ewarn
+			ewarn "Alternatively llvm-strip can be used, it supports stripping any target"
+			ewarn "define STRIP=\"llvm-strip\" to use it (experimental)"
+			ewarn
+		fi
+	done
+	fi # I_KNOW_WHAT_I_AM_DOING_CROSS
+
+	einfo "Rust configured with the following flags:"
+	echo
+	echo "RUSTFLAGS=\"${RUSTFLAGS:-}\""
+	echo "RUSTFLAGS_BOOTSTRAP=\"${RUSTFLAGS_BOOTSTRAP:-}\""
+	echo "RUSTFLAGS_NOT_BOOTSTRAP=\"${RUSTFLAGS_NOT_BOOTSTRAP:-}\""
+	cat "${S}"/config.env || die
+	echo
+	einfo "config.toml contents:"
+	cat "${S}"/config.toml || die
+	echo
+}
+
+src_compile() {
+	# we need \n IFS to have config.env with spaces loaded properly. #734018
+	(
+	IFS=$'\n'
+	env $(cat "${S}"/config.env) RUST_BACKTRACE=1\
+		"${EPYTHON}" ./x.py dist -vv --config="${S}"/config.toml -j$(makeopts_jobs) || die
+	)
+}
+
+src_test() {
+	# https://rustc-dev-guide.rust-lang.org/tests/intro.html
+
+	# those are basic and codegen tests.
+	local tests=(
+		codegen
+		codegen-units
+		compile-fail
+		incremental
+		mir-opt
+		pretty
+		run-make
+	)
+
+	# fails if llvm is not built with ALL targets.
+	# and known to fail with system llvm sometimes.
+	use system-llvm || tests+=( assembly )
+
+	# fragile/expensive/less important tests
+	# or tests that require extra builds
+	# TODO: instead of skipping, just make some nonfatal.
+	if [[ ${ERUST_RUN_EXTRA_TESTS:-no} != no ]]; then
+		tests+=(
+			rustdoc
+			rustdoc-js
+			rustdoc-js-std
+			rustdoc-ui
+			run-make-fulldeps
+			ui
+			ui-fulldeps
+		)
+	fi
+
+	local i failed=()
+	einfo "rust_src_test: enabled tests ${tests[@]/#/src/test/}"
+	for i in "${tests[@]}"; do
+		local t="src/test/${i}"
+		einfo "rust_src_test: running ${t}"
+		if ! (
+				IFS=$'\n'
+				env $(cat "${S}"/config.env) RUST_BACKTRACE=1 \
+				"${EPYTHON}" ./x.py test -vv --config="${S}"/config.toml \
+				-j$(makeopts_jobs) --no-doc --no-fail-fast "${t}"
+			)
+		then
+				failed+=( "${t}" )
+				eerror "rust_src_test: ${t} failed"
+		fi
+	done
+
+	if [[ ${#failed[@]} -ne 0 ]]; then
+		eerror "rust_src_test: failure summary: ${failed[@]}"
+		die "aborting due to test failures"
+	fi
+}
+
+src_install() {
+	(
+	IFS=$'\n'
+	env $(cat "${S}"/config.env) DESTDIR="${D}" \
+		"${EPYTHON}" ./x.py install -vv --config="${S}"/config.toml -j$(makeopts_jobs) || die
+	)
+
+	# bug #689562, #689160
+	rm -v "${ED}/usr/lib/${PN}/${PV}/etc/bash_completion.d/cargo" || die
+	rmdir -v "${ED}/usr/lib/${PN}/${PV}"/etc{/bash_completion.d,} || die
+	newbashcomp src/tools/cargo/src/etc/cargo.bashcomp.sh cargo
+
+	local symlinks=(
+		cargo
+		rustc
+		rustdoc
+		rust-gdb
+		rust-gdbgui
+		rust-lldb
+	)
+
+	use clippy && symlinks+=( clippy-driver cargo-clippy )
+	use miri && symlinks+=( miri cargo-miri )
+	use rls && symlinks+=( rls )
+	use rustfmt && symlinks+=( rustfmt cargo-fmt )
+
+	einfo "installing eselect-rust symlinks and paths: ${symlinks[@]}"
+	local i
+	for i in "${symlinks[@]}"; do
+		# we need realpath on /usr/bin/* symlink return version-appended binary path.
+		# so /usr/bin/rustc should point to /usr/lib/rust/<ver>/bin/rustc-<ver>
+		# need to fix eselect-rust to remove this hack.
+		local ver_i="${i}-${PV}"
+		if [[ -f "${ED}/usr/lib/${PN}/${PV}/bin/${i}" ]]; then
+			einfo "Installing ${i} symlink"
+			ln -v "${ED}/usr/lib/${PN}/${PV}/bin/${i}" "${ED}/usr/lib/${PN}/${PV}/bin/${ver_i}" || die
+		else
+			ewarn "${i} symlink requested, but source file not found"
+			ewarn "please report this"
+		fi
+		dosym "../lib/${PN}/${PV}/bin/${ver_i}" "/usr/bin/${ver_i}"
+	done
+
+	# symlinks to switch components to active rust in eselect
+	dosym "${PV}/lib" "/usr/lib/${PN}/lib-${PV}"
+	dosym "${PV}/libexec" "/usr/lib/${PN}/libexec-${PV}"
+	dosym "${PV}/share/man" "/usr/lib/${PN}/man-${PV}"
+	dosym "rust/${PV}/lib/rustlib" "/usr/lib/rustlib-${PV}"
+	dosym "../../lib/${PN}/${PV}/share/doc/rust" "/usr/share/doc/${P}"
+
+	newenvd - "50${P}" <<-_EOF_
+		LDPATH="${EPREFIX}/usr/lib/rust/lib"
+		MANPATH="${EPREFIX}/usr/lib/rust/man"
+		$(use amd64 && usex elibc_musl 'CARGO_TARGET_X86_64_UNKNOWN_LINUX_MUSL_RUSTFLAGS="-C target-feature=-crt-static"' '')
+		$(use arm64 && usex elibc_musl 'CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_RUSTFLAGS="-C target-feature=-crt-static"' '')
+	_EOF_
+
+	rm -rf "${ED}/usr/lib/${PN}/${PV}"/*.old || die
+	rm -rf "${ED}/usr/lib/${PN}/${PV}/doc"/*.old || die
+
+	# note: eselect-rust adds EROOT to all paths below
+	cat <<-_EOF_ > "${T}/provider-${P}"
+		/usr/bin/cargo
+		/usr/bin/rustdoc
+		/usr/bin/rust-gdb
+		/usr/bin/rust-gdbgui
+		/usr/bin/rust-lldb
+		/usr/lib/rustlib
+		/usr/lib/rust/lib
+		/usr/lib/rust/libexec
+		/usr/lib/rust/man
+		/usr/share/doc/rust
+	_EOF_
+
+	if use clippy; then
+		echo /usr/bin/clippy-driver >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-clippy >> "${T}/provider-${P}"
+	fi
+	if use miri; then
+		echo /usr/bin/miri >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-miri >> "${T}/provider-${P}"
+	fi
+	if use rls; then
+		echo /usr/bin/rls >> "${T}/provider-${P}"
+	fi
+	if use rustfmt; then
+		echo /usr/bin/rustfmt >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-fmt >> "${T}/provider-${P}"
+	fi
+
+	insinto /etc/env.d/rust
+	doins "${T}/provider-${P}"
+}
+
+pkg_postinst() {
+	eselect rust update
+
+	if has_version sys-devel/gdb || has_version dev-util/lldb; then
+		elog "Rust installs a helper script for calling GDB and LLDB,"
+		elog "for your convenience it is installed under /usr/bin/rust-{gdb,lldb}-${PV}."
+	fi
+
+	if has_version app-editors/emacs; then
+		elog "install app-emacs/rust-mode to get emacs support for rust."
+	fi
+
+	if has_version app-editors/gvim || has_version app-editors/vim; then
+		elog "install app-vim/rust-vim to get vim support for rust."
+	fi
+}
+
+pkg_postrm() {
+	eselect rust cleanup
+}