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Add Identity lang item #103985

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Add Identity lang item #103985

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This is another approach for #97974 suggested by @oli-obk.

The plan with this is then to add the TyAlias variant into the rustc_type_ir TyKind enum.

cc @compiler-errors

r? @oli-obk

@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. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Nov 4, 2022
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I added the missing "explanation" for the ignored code block in the documentation.

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jackh726 commented Nov 5, 2022

Wait...why?

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oli-obk commented Nov 5, 2022

Wait...why?

🤣 this is missing like 112% of the context. The linked PR is a huge task it seems and I wanted @GuillaumeGomez to check if the problem is that we don't normalize in enough places or whether it's just the linked PR missing a normalization for the new type alias variant wherever we normalize projections. If this pr passes, then the linked PR should be trivial instead of adding normalization to a billion places. If this PR fails, then we can build tests that fail on master by doing the same thing as what this PR does just without a lang item and contained to a single test

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Everything falls apart as soon as we run outside of bootstrap because it doesn't seem to be able to find the Identity lang item from what I can see.

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@GuillaumeGomez GuillaumeGomez mentioned this pull request Nov 15, 2022
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bors commented Nov 24, 2022

☔ The latest upstream changes (presumably #104321) made this pull request unmergeable. Please resolve the merge conflicts.

@clarfonthey clarfonthey mentioned this pull request Dec 7, 2022
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@oli-obk oli-obk added S-blocked Status: Blocked on something else such as an RFC or other implementation work. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Dec 13, 2022
@GuillaumeGomez GuillaumeGomez force-pushed the ty-alias-handling branch 2 times, most recently from f51abc6 to f51255f Compare January 12, 2023 13:32
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bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 9, 2023
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Auto merge of rust-lang#106938 - GuillaumeGomez:normalize-projection-…
c40919b 
…field-ty, r=oli-obk

Add missing normalization for union fields types

Overshadows rust-lang#106808.
From the experiment rust-lang#103985.

In short, it allows to use projections as a type for union's fields.

cc `@compiler-errors`
r? `@oli-obk`
RalfJung pushed a commit to RalfJung/miri that referenced this pull request Feb 11, 2023
@bors
Auto merge of #106938 - GuillaumeGomez:normalize-projection-field-ty,…
680fff0 
… r=oli-obk

Add missing normalization for union fields types

Overshadows rust-lang/rust#106808.
From the experiment rust-lang/rust#103985.

In short, it allows to use projections as a type for union's fields.

cc `@compiler-errors`
r? `@oli-obk`
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bors commented Mar 14, 2023

☔ The latest upstream changes (presumably #104833) made this pull request unmergeable. Please resolve the merge conflicts.

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fmease commented Nov 15, 2023 •
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Superseded by #108860 if I understand correctly. Closing as completed. Feel free to reopen if you disagree.

@fmease fmease closed this Nov 15, 2023
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S-blocked Status: Blocked on something else such as an RFC or other implementation work. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue.
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