Discourage the use of transmute to construct invalid values#388
Merged
ehuss merged 1 commit intorust-lang:masterfrom Dec 30, 2022
Merged
Discourage the use of transmute to construct invalid values#388ehuss merged 1 commit intorust-lang:masterfrom
ehuss merged 1 commit intorust-lang:masterfrom
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Update books ## rust-lang/book 3 commits in a60f4316ec923a5ac2ed6a2eba6960edb832d855..2bd5d42c9956369132228da6409f0e68da56c51a 2022-12-22 21:37:10 UTC to 2022-12-22 21:36:14 UTC - fix macos installation problem (rust-lang/book#3469) - Update -guessing-game-tutorial incorrect output (rust-lang/book#3462) - FIX: IT repo updated (rust-lang/book#3454) ## rust-lang/nomicon 1 commits in dd37e21ccee43918ed18a71581bb2af537ffe4fc..8ca261268068d80c0969260fff15199bad87b587 2022-12-30 16:32:09 UTC to 2022-12-30 16:32:09 UTC - Discourage the use of transmute to construct invalid values (rust-lang/nomicon#388) ## rust-lang/rust-by-example 6 commits in 995df09b65c582eb6290ab7ea5d9485983eb4c37..8888f9428fe9a48f31de6bd2cef9b9bf80791edc 2023-01-01 12:53:50 UTC to 2022-12-21 10:18:31 UTC - types/alias: use io::{Result,Error} instead of Io{Result,Error} (rust-lang/rust-by-example#1660) - Fix sample code mismatching its comments (rust-lang/rust-by-example#1659) - fix: add missing space (rust-lang/rust-by-example#1658) - diverging: fix issues with example code (rust-lang/rust-by-example#1631) - Update enum.md (rust-lang/rust-by-example#1645) - Clean up Chapter 2 (Primitives) (rust-lang/rust-by-example#1651) ## rust-lang/rustc-dev-guide 5 commits in 8b42eb5..b3e2a6e 2023-01-01 05:20:47 UTC to 2022-12-25 12:11:21 UTC - Add help for when you update a submodule by accident (rust-lang/rustc-dev-guide#1537) - Simplify "how to build and run" section (rust-lang/rustc-dev-guide#1528) - Replace `$TARGET` with `host` (rust-lang/rustc-dev-guide#1514) - Add more rebasing help (rust-lang/rustc-dev-guide#1536) - Fix rustc_borrowck crate name typo (rust-lang/rustc-dev-guide#1535)
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Creating null values of non-null types with transmute is undefined behavior, and the nomicon doesn't explicitly say that in the "nullable pointer optimization" chapter. Hopefully this comment will discourage the use of transmute in this case a little bit more.