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Change untagged_unions to not allow union fields with drop #62330

Merged
merged 20 commits into from
Oct 22, 2019
Merged

Change untagged_unions to not allow union fields with drop #62330

merged 20 commits into from
Oct 22, 2019

Commits on Oct 11, 2019

  1. Remove uses of allow(unions_with_drop_fields) in the standard library

    @SimonSapin @oli-obk
    SimonSapin authored and oli-obk committed Oct 11, 2019
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  2. Remove most uses of allow(unions_with_drop_fields) in tests

    @SimonSapin @oli-obk
    SimonSapin authored and oli-obk committed Oct 11, 2019
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  3. Change untagged_unions to not allow union fields with drop 

    Union fields may now never have a type with attached destructor.
This for example allows unions to use arbitrary field types only by
wrapping
them in ManuallyDrop.

The stable rule remains, that union fields must be Copy. We use the new
rule for the `untagged_union` feature.

See RFC 2514.

Note for ui tests:
We can't test move out through Box's deref-move since we can't
have a Box in a union anymore.
    @bluss @oli-obk
    bluss authored and oli-obk committed Oct 11, 2019
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  4. Remove unions_with_drop_fields lint 

    Cases where it would trigger are now hard errors.
    @SimonSapin @oli-obk
    SimonSapin authored and oli-obk committed Oct 11, 2019
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  5. Fixes rust-lang#41073, it is no longer an ICE

    @SimonSapin @oli-obk
    SimonSapin authored and oli-obk committed Oct 11, 2019
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  6. Update src/librustc_typeck/check/mod.rs 

    Co-Authored-By: Mazdak Farrokhzad <[email protected]>
    @SimonSapin @Centril @oli-obk
    2 people authored and oli-obk committed Oct 11, 2019
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  7. Update src/librustc_typeck/check/mod.rs 

    Co-Authored-By: Mazdak Farrokhzad <[email protected]>
    @SimonSapin @Centril @oli-obk
    2 people authored and oli-obk committed Oct 11, 2019
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  8. Update src/librustc_typeck/error_codes.rs 

    Co-Authored-By: Mazdak Farrokhzad <[email protected]>
    @SimonSapin @Centril @oli-obk
    2 people authored and oli-obk committed Oct 11, 2019
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  9. Update src/test/run-pass/union/union-nodrop.rs 

    Co-Authored-By: Mazdak Farrokhzad <[email protected]>
    @SimonSapin @Centril @oli-obk
    2 people authored and oli-obk committed Oct 11, 2019
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  10. More descriptive variable name

    @SimonSapin @oli-obk
    SimonSapin authored and oli-obk committed Oct 11, 2019
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  11. Extend union-nodrop.rs test

    @SimonSapin @oli-obk
    SimonSapin authored and oli-obk committed Oct 11, 2019
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  12. rpass tests are now part of ui tests

    @oli-obk
    oli-obk committed Oct 11, 2019
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  13. Preserve originally intended test semantics

    @oli-obk
    oli-obk committed Oct 11, 2019
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  14. Prefer ManuallyDrop::{take,new} over ptr::{read,write}

    @oli-obk
    oli-obk committed Oct 11, 2019
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  15. Clarify a vague comment

    @oli-obk
    oli-obk committed Oct 11, 2019
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  16. Ensure we do not treat all unions as not having any drop glue.

    @oli-obk
    oli-obk committed Oct 11, 2019
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  17. Update ui stderr

    @oli-obk
    oli-obk committed Oct 11, 2019
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Commits on Oct 17, 2019

  1. Rebase fallout

    @oli-obk
    oli-obk committed Oct 17, 2019
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Commits on Oct 21, 2019

  1. Don't silently do nothing on mis_use of check_union_fields

    @oli-obk
    oli-obk committed Oct 21, 2019
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  2. Report even duplilcate errors in case the feature gat is not active

    @oli-obk
    oli-obk committed Oct 21, 2019
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