Clarify that {self} imports require a module parent#2221
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The `self` keyword in a use brace (e.g., `use m::{self}`) creates a
binding for the parent entity. The note in `items.use.self.intro`
says that `self` "means the current module of the parent segment", but
there's no rule restricting what the parent can be.
The parent path must resolve to a module, enumeration, or trait --
i.e., entities that act as modules for name resolution. Using `self`
with other entities such as structs or unions is rejected by the
compiler (as of rust-lang/rust#152996).
Let's add a rule to make this restriction explicit.
In the prior commit, we added a link reference definition for "brace syntax". Let's update the other use in the chapter to use that.
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…etrochenkov Replacing `self` overwriting with proper resolution Reference PR: - rust-lang/reference#2221 As a follow-up PR to #146972 ([step 1](#152996 (comment))), after this PR: ~~1. Trailing `self` can appear in paths (as the consensus in #146972 (comment) (in future) ~~2. [E0429](https://doc.rust-lang.org/stable/error_codes/E0429.html#error-code-e0429) will be no longer emitted, `use ...::self [as target];` will be equivalent to `use ...::{self [as target]};`~~ (in future) 3. Things like `struct S {}; use S::{self as Other};` will be rejected --- This PR used to add a new lint `redundant_self`, which would lint `use ...::self [as target];` and `use ...::{self [as target]};`, and fixes all warnings emitted by this lint. But this lint and clippy lint [unnecessary_self_imports](https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_self_imports) have some overlap. And `use std::io::self;` is not equivalent to `use std::io` in fact for now, the new lint will also cause the following known issue: > Removing `::{self}` will cause any non-module items at the same path to also be imported. This might cause a naming conflict (rust-lang/rustfmt#3568). So I removed this lint, and I think what it does should be done by extending the clippy lint `unnecessary_self_imports`. r? petrochenkov
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…etrochenkov Replacing `self` overwriting with proper resolution Reference PR: - rust-lang/reference#2221 As a follow-up PR to rust-lang/rust#146972 ([step 1](rust-lang/rust#152996 (comment))), after this PR: ~~1. Trailing `self` can appear in paths (as the consensus in rust-lang/rust#146972 (comment) (in future) ~~2. [E0429](https://doc.rust-lang.org/stable/error_codes/E0429.html#error-code-e0429) will be no longer emitted, `use ...::self [as target];` will be equivalent to `use ...::{self [as target]};`~~ (in future) 3. Things like `struct S {}; use S::{self as Other};` will be rejected --- This PR used to add a new lint `redundant_self`, which would lint `use ...::self [as target];` and `use ...::{self [as target]};`, and fixes all warnings emitted by this lint. But this lint and clippy lint [unnecessary_self_imports](https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_self_imports) have some overlap. And `use std::io::self;` is not equivalent to `use std::io` in fact for now, the new lint will also cause the following known issue: > Removing `::{self}` will cause any non-module items at the same path to also be imported. This might cause a naming conflict (rust-lang/rustfmt#3568). So I removed this lint, and I think what it does should be done by extending the clippy lint `unnecessary_self_imports`. r? petrochenkov
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Update books ## rust-embedded/book 2 commits in 2463edeb8003c5743918b3739a9f6870b86396f5..0789b0f29e73ecb91213cac10ad0eec1b9333770 2026-04-11 08:46:22 UTC to 2026-04-10 14:01:38 UTC - remove IO chapter, is covered in next chapter (rust-embedded/book#411) - add embassy chapter (rust-embedded/book#412) ## rust-lang/reference 10 commits in d2715c07e9dd9839c0c7675ecfa18bec539a6ee9..8c88f9d0bdd75ffdc0691676d83212ae22a18cee 2026-04-20 15:20:24 UTC to 2026-04-07 16:25:09 UTC - typo in example code (rust-lang/reference#2232) - oxford comma (rust-lang/reference#2233) - improve readability (rust-lang/reference#2234) - typo (rust-lang/reference#2230) - Clarify items.fn.generics.param-bounds (rust-lang/reference#2229) - follow formatting style guideline (rust-lang/reference#2228) - Update `derive` export locations (rust-lang/reference#2223) - Clarify that `{self}` imports require a module parent (rust-lang/reference#2221) - stabilize s390x vector registers (rust-lang/reference#2215) - Fix misuse of *usage* throughout the Reference (rust-lang/reference#2222) ## rust-lang/rust-by-example 2 commits in b31e3b8da01eeba0460f86a52a55af82709fadf5..898f0ac1479223d332309e0fce88d44b39927d28 2026-04-19 11:40:28 UTC to 2026-04-19 11:38:45 UTC - remove debug printing for the u32 and bool in variable_bindings.md (rust-lang/rust-by-example#1999) - Update for.md (rust-lang/rust-by-example#2008)
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Rollup merge of #155568 - rustbot:docs-update, r=ehuss Update books ## rust-embedded/book 2 commits in 2463edeb8003c5743918b3739a9f6870b86396f5..0789b0f29e73ecb91213cac10ad0eec1b9333770 2026-04-11 08:46:22 UTC to 2026-04-10 14:01:38 UTC - remove IO chapter, is covered in next chapter (rust-embedded/book#411) - add embassy chapter (rust-embedded/book#412) ## rust-lang/reference 10 commits in d2715c07e9dd9839c0c7675ecfa18bec539a6ee9..8c88f9d0bdd75ffdc0691676d83212ae22a18cee 2026-04-20 15:20:24 UTC to 2026-04-07 16:25:09 UTC - typo in example code (rust-lang/reference#2232) - oxford comma (rust-lang/reference#2233) - improve readability (rust-lang/reference#2234) - typo (rust-lang/reference#2230) - Clarify items.fn.generics.param-bounds (rust-lang/reference#2229) - follow formatting style guideline (rust-lang/reference#2228) - Update `derive` export locations (rust-lang/reference#2223) - Clarify that `{self}` imports require a module parent (rust-lang/reference#2221) - stabilize s390x vector registers (rust-lang/reference#2215) - Fix misuse of *usage* throughout the Reference (rust-lang/reference#2222) ## rust-lang/rust-by-example 2 commits in b31e3b8da01eeba0460f86a52a55af82709fadf5..898f0ac1479223d332309e0fce88d44b39927d28 2026-04-19 11:40:28 UTC to 2026-04-19 11:38:45 UTC - remove debug printing for the u32 and bool in variable_bindings.md (rust-lang/rust-by-example#1999) - Update for.md (rust-lang/rust-by-example#2008)
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Update books ## rust-embedded/book 2 commits in 2463edeb8003c5743918b3739a9f6870b86396f5..0789b0f29e73ecb91213cac10ad0eec1b9333770 2026-04-11 08:46:22 UTC to 2026-04-10 14:01:38 UTC - remove IO chapter, is covered in next chapter (rust-embedded/book#411) - add embassy chapter (rust-embedded/book#412) ## rust-lang/reference 10 commits in d2715c07e9dd9839c0c7675ecfa18bec539a6ee9..8c88f9d0bdd75ffdc0691676d83212ae22a18cee 2026-04-20 15:20:24 UTC to 2026-04-07 16:25:09 UTC - typo in example code (rust-lang/reference#2232) - oxford comma (rust-lang/reference#2233) - improve readability (rust-lang/reference#2234) - typo (rust-lang/reference#2230) - Clarify items.fn.generics.param-bounds (rust-lang/reference#2229) - follow formatting style guideline (rust-lang/reference#2228) - Update `derive` export locations (rust-lang/reference#2223) - Clarify that `{self}` imports require a module parent (rust-lang/reference#2221) - stabilize s390x vector registers (rust-lang/reference#2215) - Fix misuse of *usage* throughout the Reference (rust-lang/reference#2222) ## rust-lang/rust-by-example 2 commits in b31e3b8da01eeba0460f86a52a55af82709fadf5..898f0ac1479223d332309e0fce88d44b39927d28 2026-04-19 11:40:28 UTC to 2026-04-19 11:38:45 UTC - remove debug printing for the u32 and bool in variable_bindings.md (rust-lang/rust-by-example#1999) - Update for.md (rust-lang/rust-by-example#2008)
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The
selfkeyword in a use brace (e.g.,use m::{self}) creates a binding for the parent entity. The note initems.use.self.introsays thatself"means the current module of the parent segment", but there's no rule restricting what the parent can be.The parent path must resolve to a module, enumeration, or trait -- i.e., entities that act as modules for name resolution. Using
selfwith other entities such as structs or unions is rejected by the compiler (as of rust-lang/rust#152996).Let's add a rule to make this restriction explicit.
See:
selfoverwriting with proper resolution rust#152996cc @ehuss @mu001999 @petrochenkov