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Merge pull request #709 from pamolloy/pmolloy/minor-grammar

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Reword sentence in first post
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Philipp Oppermann
2019-12-29 17:51:56 +01:00
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parent bf5e2cf4dc d9d204a6cd
commit 6db4e34c48
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blog/content/second-edition/posts/01-freestanding-rust-binary/index.md
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@@ -145,7 +145,7 @@ Language items are special functions and types that are required internally by t
[`Copy`]: https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html
[copy code]: https://github.com/rust-lang/rust/blob/485397e49a02a3b7ff77c17e4a3f16c653925cb3/src/libcore/marker.rs#L296-L299
Providing own implementations of language items would be possible, but this should only be done as a last resort. The reason is that language items are highly unstable implementation details and not even type checked (so the compiler doesn't even check if a function has the right argument types). Fortunately, there is a more stable way to fix the above language item error.
While providing custom implementations of language items is possible, it should only be done as a last resort. The reason is that language items are highly unstable implementation details and not even type checked (so the compiler doesn't even check if a function has the right argument types). Fortunately, there is a more stable way to fix the above language item error.
The `eh_personality` language item marks a function that is used for implementing [stack unwinding]. By default, Rust uses unwinding to run the destructors of all live stack variables in case of a [panic]. This ensures that all used memory is freed and allows the parent thread to catch the panic and continue execution. Unwinding, however, is a complicated process and requires some OS specific libraries (e.g. [libunwind] on Linux or [structured exception handling] on Windows), so we don't want to use it for our operating system.