921cfbe56f
Improve error messages involving `derive` and `packed`. There are two errors involving `derive` and `packed`. ``` `#[derive]` can't be derived on a `#[repr(packed)]` struct with type or const parameters `#[derive]` can't be derived on a `#[repr(packed)]` struct that does not derive Copy ``` The second one overstates things. It is possible to use derive on a repr(packed) struct that doesn't derive Copy in two cases. - If all the fields within the struct meet the required alignment: 1 for `repr(packed)`, or `N` for `repr(packed(N))`. - If `Default` is the only trait derived. This commit improves things in a few ways. - Changes the errors to say `this trait can't be derived on this ...`. This is more accurate, because it's just *this* trait and *this* packed struct that are a problem, not *all* derived traits on *all* packed structs. - Adds more details to the "ERROR" lines in the test case, enough to distinguish between the two error messages. - Adds more cases to the test case that don't cause errors, e.g. `Default` derives. - Uses a wider variety of builtin traits in the test case, for better coverage. r? `@estebank` |
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| .. | ||
| bootstrap | ||
| ci | ||
| doc | ||
| etc | ||
| librustdoc | ||
| llvm-project@8b6b5014fd | ||
| rustdoc-json-types | ||
| test | ||
| tools | ||
| README.md | ||
| stage0.json | ||
| version | ||
This directory contains the source code of the rust project, including:
- The test suite
- The bootstrapping build system
- Various submodules for tools, like rustdoc, rls, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.