Auto merge of #103859 - Mark-Simulacrum:stable-next, r=flip1995

[stable] Lower lint level for READ_ZERO_BYTE_VEC

This avoids reporting false-positives; see rust-lang/rust-clippy#9274 for details.

cc `@rust-lang/clippy` -- do we want a direct change landed on stable here? If so, please r+ this PR, otherwise we can just close it. Would appreciate confirmation this is the right change to make as well.

cc `@joshtriplett` -- filing due to https://rust-lang.zulipchat.com/#narrow/stream/301329-t-devtools/topic/clippy.20false.20positive

Author: bors

src/bootstrap/config.rs

@@ -1280,11 +1280,21 @@ impl Config {
         git
     }
 
-    pub(crate) fn artifact_channel(&self, commit: &str) -> String {
+    pub(crate) fn artifact_version_part(&self, commit: &str) -> String {
         let mut channel = self.git();
         channel.arg("show").arg(format!("{}:src/ci/channel", commit));
         let channel = output(&mut channel);
-        channel.trim().to_owned()
+
+        let mut version = self.git();
+        version.arg("show").arg(format!("{}:src/version", commit));
+        let version = output(&mut version);
+
+        match channel.trim() {
+            "stable" => version.trim().to_owned(),
+            "beta" => channel.trim().to_owned(),
+            "nightly" => channel.trim().to_owned(),
+            other => unreachable!("{:?} is not recognized as a valid channel", other),
+        }
     }
 
     /// Try to find the relative path of `bindir`, otherwise return it in full.
@@ -1526,7 +1536,7 @@ fn maybe_download_rustfmt(builder: &Builder<'_>) -> Option<PathBuf> {
 
 fn download_ci_rustc(builder: &Builder<'_>, commit: &str) {
     builder.verbose(&format!("using downloaded stage2 artifacts from CI (commit {commit})"));
-    let channel = builder.config.artifact_channel(commit);
+    let version = builder.config.artifact_version_part(commit);
     let host = builder.config.build.triple;
     let bin_root = builder.out.join(host).join("ci-rustc");
     let rustc_stamp = bin_root.join(".rustc-stamp");
@@ -1535,13 +1545,13 @@ fn download_ci_rustc(builder: &Builder<'_>, commit: &str) {
         if bin_root.exists() {
             t!(fs::remove_dir_all(&bin_root));
         }
-        let filename = format!("rust-std-{channel}-{host}.tar.xz");
+        let filename = format!("rust-std-{version}-{host}.tar.xz");
         let pattern = format!("rust-std-{host}");
         download_ci_component(builder, filename, &pattern, commit);
-        let filename = format!("rustc-{channel}-{host}.tar.xz");
+        let filename = format!("rustc-{version}-{host}.tar.xz");
         download_ci_component(builder, filename, "rustc", commit);
         // download-rustc doesn't need its own cargo, it can just use beta's.
-        let filename = format!("rustc-dev-{channel}-{host}.tar.xz");
+        let filename = format!("rustc-dev-{version}-{host}.tar.xz");
         download_ci_component(builder, filename, "rustc-dev", commit);
 
         builder.fix_bin_or_dylib(&bin_root.join("bin").join("rustc"));

src/bootstrap/native.rs

@@ -260,8 +260,8 @@ fn download_ci_llvm(builder: &Builder<'_>, llvm_sha: &str) {
     } else {
         &builder.config.stage0_metadata.config.artifacts_server
     };
-    let channel = builder.config.artifact_channel(llvm_sha);
-    let filename = format!("rust-dev-{}-{}.tar.xz", channel, builder.build.build.triple);
+    let version = builder.config.artifact_version_part(llvm_sha);
+    let filename = format!("rust-dev-{}-{}.tar.xz", version, builder.build.build.triple);
     let tarball = rustc_cache.join(&filename);
     if !tarball.exists() {
         let help_on_error = "error: failed to download llvm from ci

src/tools/clippy/clippy_lints/src/lib.register_all.rs

@@ -289,7 +289,6 @@ store.register_group(true, "clippy::all", Some("clippy_all"), vec![
     LintId::of(ranges::MANUAL_RANGE_CONTAINS),
     LintId::of(ranges::REVERSED_EMPTY_RANGES),
     LintId::of(rc_clone_in_vec_init::RC_CLONE_IN_VEC_INIT),
-    LintId::of(read_zero_byte_vec::READ_ZERO_BYTE_VEC),
     LintId::of(redundant_clone::REDUNDANT_CLONE),
     LintId::of(redundant_closure_call::REDUNDANT_CLOSURE_CALL),
     LintId::of(redundant_field_names::REDUNDANT_FIELD_NAMES),

src/tools/clippy/clippy_lints/src/lib.register_correctness.rs

@@ -59,7 +59,6 @@ store.register_group(true, "clippy::correctness", Some("clippy_correctness"), ve
     LintId::of(ptr::INVALID_NULL_PTR_USAGE),
     LintId::of(ptr::MUT_FROM_REF),
     LintId::of(ranges::REVERSED_EMPTY_RANGES),
-    LintId::of(read_zero_byte_vec::READ_ZERO_BYTE_VEC),
     LintId::of(regex::INVALID_REGEX),
     LintId::of(serde_api::SERDE_API_MISUSE),
     LintId::of(size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT),

src/tools/clippy/clippy_lints/src/lib.register_nursery.rs

@@ -25,11 +25,14 @@ store.register_group(true, "clippy::nursery", Some("clippy_nursery"), vec![
     LintId::of(non_send_fields_in_send_ty::NON_SEND_FIELDS_IN_SEND_TY),
     LintId::of(nonstandard_macro_braces::NONSTANDARD_MACRO_BRACES),
     LintId::of(option_if_let_else::OPTION_IF_LET_ELSE),
+    LintId::of(read_zero_byte_vec::READ_ZERO_BYTE_VEC),
     LintId::of(redundant_pub_crate::REDUNDANT_PUB_CRATE),
     LintId::of(regex::TRIVIAL_REGEX),
     LintId::of(strings::STRING_LIT_AS_BYTES),
     LintId::of(suspicious_operation_groupings::SUSPICIOUS_OPERATION_GROUPINGS),
     LintId::of(trailing_empty_array::TRAILING_EMPTY_ARRAY),
+    LintId::of(trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS),
+    LintId::of(trait_bounds::TYPE_REPETITION_IN_BOUNDS),
     LintId::of(transmute::TRANSMUTE_UNDEFINED_REPR),
     LintId::of(unused_peekable::UNUSED_PEEKABLE),
     LintId::of(unused_rounding::UNUSED_ROUNDING),

src/tools/clippy/clippy_lints/src/lib.register_pedantic.rs

@@ -88,8 +88,6 @@ store.register_group(true, "clippy::pedantic", Some("clippy_pedantic"), vec![
     LintId::of(return_self_not_must_use::RETURN_SELF_NOT_MUST_USE),
     LintId::of(semicolon_if_nothing_returned::SEMICOLON_IF_NOTHING_RETURNED),
     LintId::of(strings::STRING_ADD_ASSIGN),
-    LintId::of(trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS),
-    LintId::of(trait_bounds::TYPE_REPETITION_IN_BOUNDS),
     LintId::of(transmute::TRANSMUTE_PTR_TO_PTR),
     LintId::of(types::LINKEDLIST),
     LintId::of(types::OPTION_OPTION),

src/tools/clippy/clippy_lints/src/read_zero_byte_vec.rs

@@ -43,7 +43,7 @@ declare_clippy_lint! {
     /// ```
     #[clippy::version = "1.63.0"]
     pub READ_ZERO_BYTE_VEC,
-    correctness,
+    nursery,
     "checks for reads into a zero-length `Vec`"
 }
 declare_lint_pass!(ReadZeroByteVec => [READ_ZERO_BYTE_VEC]);