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E0793: Clarify that it applies to unions as well #131472

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@kupiakos kupiakos commented Oct 9, 2024

Also:

  • Adjust the language slightly to be more consistent with other similar messages (was created instead of got created).
  • Add a short section on union.
  • Add an example line showing referencing a field in a packed struct is safe if the field's type isn't more strictly aligned than the pack.

This might need to wait for #131456 to merge first? Not sure.

r? compiler-errors

Also:

- Adjust the language slightly to be more consistent with other similar messages (`was created` instead of `got created`).
- Add a short section on `union`
- Add an example line showing referencing a field in a packed struct is safe if the field's type isn't more strictly aligned than the pack.
@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Oct 9, 2024
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bors commented Oct 10, 2024

☔ The latest upstream changes (presumably #131458) made this pull request unmergeable. Please resolve the merge conflicts.

let foo = Foo { field1: 0 };
// Accessing the field directly is fine.
let val = foo.field1;
// A reference to a packed union field causes a error.
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Suggested change
// A reference to a packed union field causes a error.
// A reference to a packed union field causes an error.

Comment on lines +74 to +77
// Accessing the field directly is fine.
let val = foo.field1;
// A reference to a packed union field causes a error.
let val = &foo.field1; // ERROR
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Suggested change
// Accessing the field directly is fine.
let val = foo.field1;
// A reference to a packed union field causes a error.
let val = &foo.field1; // ERROR
// Accessing the field directly is fine.
let val = foo.field1;
// A reference to a packed union field causes a error.
let val = &foo.field1; // ERROR

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@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 14, 2024
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@kupiakos

ping from triage - can you post your status on this PR and address the comments from the reviewer?

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5 participants