Update books

[ehuss]

nomicon

10 commits in 55de6fa3c1f331774da19472c9ee57d2ae9eb039..b9ca313e687c991223e23e5520529815dc281205
2021-05-12 00:31:01 +0900 to 2021-06-22 12:02:20 -0400

• The #[repr(C)] attribute on the callback example is not necessary, since the type is not used in C.
• Reorganize some chapters (Reorganize some chapters nomicon#282)
• Mention "extern types" on the opaque structs section (Mention "extern types" on the opaque structs section nomicon#273)
• Clarify the conditions on the aliasing section (Clarify the conditions on the aliasing section nomicon#272)
• Upgrade to edition 2018 (Upgrade to edition 2018 nomicon#280)
• Update some wording making reference to issues/RFCs (Update some wording making reference to issues/RFCs nomicon#271)
• Some improvements on the "subtyping" chapter (Some improvements on the "subtyping" chapter nomicon#278)
• Clarify casting between the same size fixed ints (Clarify casting between the same size fixed ints nomicon#277)
• Add a link to show why unused lifetimes on structs are forbidden (Add a link to show why unused lifetimes on structs are forbidden nomicon#276)
• Fix small typo in the Drop Check chapter (Fix small typo in the Drop Check chapter nomicon#275)

reference

8 commits in 8f598e2af6c25b4a7ee88ef6a8196d9b8ea50ca8..d9699fa8f3186440fdaadd703d63d8d42322c176
2021-06-01 19:00:46 +0100 to 2021-06-21 12:23:10 -0700

• Make explicit reference to scrutinee expression in grammar snippet (Make explicit reference to scrutinee expression in grammar snippet reference#1044)
• Document sub-namespaces. (Document sub-namespaces. reference#1043)
• Default all examples to 2018 edition. (Default all examples to 2018 edition. reference#1041)
• Minor update to macros. (Minor update to macros. reference#1048)
• (Mention that MAX / -1 and MAX % -1 always panic reference#1049)
• Add a note why the same size int casting is a no-op (Add a note why the same size int casting is a no-op reference#1046)
• Add notes on #[target_feature] for wasm (Add notes on #[target_feature] for wasm reference#1047)
• Make statement about variable visibility more precise (Make statement about variable visibility more precise reference#1045)

rustc-dev-guide

8 commits in c8da5bfd1c7c71d90ef1646f5e0a9f6609d5c78a..fe34beddb41dea5cb891032512a8d5b842b99696
2021-06-04 09:08:56 +0200 to 2021-06-21 21:50:12 +0200

• Update "Inference variables" section (Update "Inference variables" section rustc-dev-guide#1145)
• Document how to run unit tests (Document how to run unit tests rustc-dev-guide#1141)
• We stopped using allow_internal_unstable a while ago (We stopped using allow_internal_unstable a while ago rustc-dev-guide#1142)
• Change the feature used as an example of stabilizing lib features (Change the feature used as an example of stabilizing lib features rustc-dev-guide#1143)
• We use HIR to do type inference, trait solving and type checking (We use HIR to do type inference, trait solving and type checking rustc-dev-guide#1139)
• Add suggested settings note for coc (Add suggested settings note for coc rustc-dev-guide#1144)
• move 7/8 to prose
• Add a section on keeping things up to date in the git section

edition-guide

2 commits in 302a115e8f71876dfc884aebb0ca5ccb02b8a962..c74b2a0d6bf55774cf15d69f05dfe05408b8f81a
2021-05-21 10:46:11 -0400 to 2021-06-14 10:48:27 -0700

• Fix lies. (Fix lies. edition-guide#244)
• Add short summaries to all 2021 edition changes. (Add short summaries to all 2021 edition changes. edition-guide#243)

embedded-book

1 commits in 7349d173fa28a0bb834cf0264a05286620ef0923..cbec77fbd8eea0c13e390dd9eded1ae200e811d1
2021-05-25 13:59:05 +0000 to 2021-06-10 06:26:32 +0000

• Fix punctuation in c-with-rust.md (Fix punctuation in c-with-rust.md rust-embedded/book#294)

[rust-highfive]

⚠️ Warning ⚠️

• These commits modify submodules.

[ehuss]

@bors r+ rollup

[bors]

📌 Commit ac604ac has been approved by ehuss