Drop deprecated nursery rule group

crates/ruff/src/commands/rule.rs

@@ -36,7 +36,7 @@ impl<'a> Explanation<'a> {
             message_formats: rule.message_formats(),
             fix,
             explanation: rule.explanation(),
-            preview: rule.is_preview() || rule.is_nursery(),
+            preview: rule.is_preview(),
         }
     }
 }
@@ -62,7 +62,7 @@ fn format_rule_text(rule: Rule) -> String {
         output.push('\n');
     }
 
-    if rule.is_preview() || rule.is_nursery() {
+    if rule.is_preview() {
         output.push_str(
             r"This rule is in preview and is not stable. The `--preview` flag is required for use.",
         );

crates/ruff/tests/integration_test.rs

@@ -860,111 +860,6 @@ fn show_statistics() {
     "###);
 }
 
-#[test]
-fn nursery_prefix() {
-    // Should only detect RUF90X, but not the unstable test rules
-    let mut cmd = RuffCheck::default()
-        .args(["--select", "RUF9", "--output-format=concise"])
-        .build();
-    assert_cmd_snapshot!(cmd, @r###"
-    success: false
-    exit_code: 1
-    ----- stdout -----
-    -:1:1: RUF900 Hey this is a stable test rule.
-    -:1:1: RUF901 [*] Hey this is a stable test rule with a safe fix.
-    -:1:1: RUF902 Hey this is a stable test rule with an unsafe fix.
-    -:1:1: RUF903 Hey this is a stable test rule with a display only fix.
-    -:1:1: RUF920 Hey this is a deprecated test rule.
-    -:1:1: RUF921 Hey this is another deprecated test rule.
-    -:1:1: RUF950 Hey this is a test rule that was redirected from another.
-    Found 7 errors.
-    [*] 1 fixable with the `--fix` option (1 hidden fix can be enabled with the `--unsafe-fixes` option).
-
-    ----- stderr -----
-    "###);
-}
-
-#[test]
-fn nursery_all() {
-    // Should detect RUF90X, but not the unstable test rules
-    let mut cmd = RuffCheck::default()
-        .args(["--select", "ALL", "--output-format=concise"])
-        .build();
-    assert_cmd_snapshot!(cmd, @r###"
-    success: false
-    exit_code: 1
-    ----- stdout -----
-    -:1:1: D100 Missing docstring in public module
-    -:1:1: RUF900 Hey this is a stable test rule.
-    -:1:1: RUF901 [*] Hey this is a stable test rule with a safe fix.
-    -:1:1: RUF902 Hey this is a stable test rule with an unsafe fix.
-    -:1:1: RUF903 Hey this is a stable test rule with a display only fix.
-    -:1:1: RUF920 Hey this is a deprecated test rule.
-    -:1:1: RUF921 Hey this is another deprecated test rule.
-    -:1:1: RUF950 Hey this is a test rule that was redirected from another.
-    Found 8 errors.
-    [*] 1 fixable with the `--fix` option (1 hidden fix can be enabled with the `--unsafe-fixes` option).
-
-    ----- stderr -----
-    warning: `one-blank-line-before-class` (D203) and `no-blank-line-before-class` (D211) are incompatible. Ignoring `one-blank-line-before-class`.
-    warning: `multi-line-summary-first-line` (D212) and `multi-line-summary-second-line` (D213) are incompatible. Ignoring `multi-line-summary-second-line`.
-    "###);
-}
-
-#[test]
-fn nursery_direct() {
-    // Should fail when a nursery rule is selected without the preview flag
-    // Before Ruff v0.2.0 this would warn
-    let mut cmd = RuffCheck::default()
-        .args(["--select", "RUF912", "--output-format=concise"])
-        .build();
-    assert_cmd_snapshot!(cmd, @r###"
-    success: false
-    exit_code: 2
-    ----- stdout -----
-
-    ----- stderr -----
-    ruff failed
-      Cause: Selection of unstable rule `RUF912` without the `--preview` flag is not allowed.
-    "###);
-}
-
-#[test]
-fn nursery_group_selector() {
-    // The NURSERY selector is removed but parses in the CLI for a nicer error message
-    // Before Ruff v0.2.0 this would warn
-    let mut cmd = RuffCheck::default()
-        .args(["--select", "NURSERY", "--output-format=concise"])
-        .build();
-    assert_cmd_snapshot!(cmd, @r###"
-    success: false
-    exit_code: 2
-    ----- stdout -----
-
-    ----- stderr -----
-    ruff failed
-      Cause: The `NURSERY` selector was removed. Use the `--preview` flag instead.
-    "###);
-}
-
-#[test]
-fn nursery_group_selector_preview_enabled() {
-    // When preview mode is enabled, we shouldn't suggest using the `--preview` flag.
-    // Before Ruff v0.2.0 this would warn
-    let mut cmd = RuffCheck::default()
-        .args(["--select", "NURSERY", "--preview"])
-        .build();
-    assert_cmd_snapshot!(cmd, @r###"
-    success: false
-    exit_code: 2
-    ----- stdout -----
-
-    ----- stderr -----
-    ruff failed
-      Cause: The `NURSERY` selector was removed. Unstable rules should be selected individually or by their respective groups.
-    "###);
-}
-
 #[test]
 fn preview_enabled_prefix() {
     // All the RUF9XX test rules should be triggered
@@ -980,9 +875,8 @@ fn preview_enabled_prefix() {
     -:1:1: RUF902 Hey this is a stable test rule with an unsafe fix.
     -:1:1: RUF903 Hey this is a stable test rule with a display only fix.
     -:1:1: RUF911 Hey this is a preview test rule.
-    -:1:1: RUF912 Hey this is a nursery test rule.
     -:1:1: RUF950 Hey this is a test rule that was redirected from another.
-    Found 7 errors.
+    Found 6 errors.
     [*] 1 fixable with the `--fix` option (1 hidden fix can be enabled with the `--unsafe-fixes` option).
 
     ----- stderr -----
@@ -1005,9 +899,8 @@ fn preview_enabled_all() {
     -:1:1: RUF902 Hey this is a stable test rule with an unsafe fix.
     -:1:1: RUF903 Hey this is a stable test rule with a display only fix.
     -:1:1: RUF911 Hey this is a preview test rule.
-    -:1:1: RUF912 Hey this is a nursery test rule.
     -:1:1: RUF950 Hey this is a test rule that was redirected from another.
-    Found 9 errors.
+    Found 8 errors.
     [*] 1 fixable with the `--fix` option (1 hidden fix can be enabled with the `--unsafe-fixes` option).
 
     ----- stderr -----
@@ -1145,9 +1038,8 @@ fn preview_enabled_group_ignore() {
     -:1:1: RUF902 Hey this is a stable test rule with an unsafe fix.
     -:1:1: RUF903 Hey this is a stable test rule with a display only fix.
     -:1:1: RUF911 Hey this is a preview test rule.
-    -:1:1: RUF912 Hey this is a nursery test rule.
     -:1:1: RUF950 Hey this is a test rule that was redirected from another.
-    Found 7 errors.
+    Found 6 errors.
     [*] 1 fixable with the `--fix` option (1 hidden fix can be enabled with the `--unsafe-fixes` option).
 
     ----- stderr -----

crates/ruff_dev/src/generate_docs.rs

@@ -64,7 +64,7 @@ pub(crate) fn main(args: &Args) -> Result<()> {
                 output.push('\n');
             }
 
-            if rule.is_preview() || rule.is_nursery() {
+            if rule.is_preview() {
                 output.push_str(
                     r"This rule is unstable and in [preview](../preview.md). The `--preview` flag is required for use.",
                 );

crates/ruff_dev/src/generate_rules_table.rs

@@ -34,7 +34,7 @@ fn generate_table(table_out: &mut String, rules: impl IntoIterator<Item = Rule>,
                 format!("<span title='Rule has been deprecated'>{WARNING_SYMBOL}</span>")
             }
             #[allow(deprecated)]
-            RuleGroup::Preview | RuleGroup::Nursery => {
+            RuleGroup::Preview => {
                 format!("<span title='Rule is in preview'>{PREVIEW_SYMBOL}</span>")
             }
             RuleGroup::Stable => {