[derive] Overhaul repr parsing #1752
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Represent the result of parsing all `#[repr(...)]` attributes on a type as a high-level type which is only capable of representing valid combinations of `#[repr(...)]` attributes and processes them into a concise representation that's easier for high-level code to work with. This prepares us to more easily fix #1748. While we're here, we make a number of other improvements. 1) Errors are now converted to `TokenStream`s as late as possible rather than as early as possible, which was the previous behavior. This allows us to bail early when deriving an implied trait fails (e.g., deriving `TryFromBytes` when the user wrote `#[derive(FromZeros)]`). 2) Avoid re-computing some repr information in `TryFromBytes` enum support.
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Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #1752 +/- ##
=======================================
Coverage 87.46% 87.46%
=======================================
Files 16 16
Lines 6021 6021
=======================================
Hits 5266 5266
Misses 755 755 ☔ View full report in Codecov by Sentry. |
joshlf
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Sep 28, 2024
This was referenced Sep 30, 2024
jswrenn
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Sep 30, 2024
joshlf
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djkoloski’s stale review
Addressed all feedback; re-reviewed by @jswrenn
This was referenced Oct 1, 2024
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Represent the result of parsing all
#[repr(...)]attributes on a type as a high-level type which is only capable of representing valid combinations of#[repr(...)]attributes and processes them into a concise representation that's easier for high-level code to work with.This prepares us to more easily fix #1748.
While we're here, we make a number of other improvements.
TokenStreams as late as possible rather than as early as possible, which was the previous behavior. This allows us to bail early when deriving an implied trait fails (e.g., derivingTryFromByteswhen the user wrote#[derive(FromZeros)]).TryFromBytesenum support.