fix(ci): rule check error messages (#3158)

This commit also fixes a false negative of the rule `noUnmatchableAnbSelector`.

CHANGELOG.md

@@ -9,6 +9,28 @@ New entries must be placed in a section entitled `Unreleased`.
 Read
 our [guidelines for writing a good changelog entry](https://github.com/biomejs/biome/blob/main/CONTRIBUTING.md#changelog).
 
+## Unreleased
+
+### Analyzer
+
+### CLI
+
+### Configuration
+
+### Editors
+
+### Formatter
+
+### JavaScript APIs
+
+### Linter
+
+#### Bug fixes
+
+- The [`noUnmatchableAnbSelector`](https://biomejs.dev/linter/rules/no-unmatchable-anb-selector/) rule is now able to catch unmatchable `an+b` selectors like `0n+0` or `-0n+0`. Contributed by @Sec-ant.
+
+### Parser
+
 ## v1.8.1 (2024-06-10)
 
 ### Analyzer

crates/biome_css_analyze/src/lint/nursery/no_unmatchable_anb_selector.rs

@@ -98,7 +98,8 @@ fn is_unmatchable(nth: &AnyCssPseudoClassNth) -> bool {
         AnyCssPseudoClassNth::CssPseudoClassNthIdentifier(_) => false,
         AnyCssPseudoClassNth::CssPseudoClassNth(nth) => {
             let coefficient = nth.value();
-            let constant = nth.offset();
+            let constant = nth.offset().and_then(|offset| offset.value().ok());
+
             match (coefficient, constant) {
                 (Some(a), Some(b)) => a.text() == "0" && b.text() == "0",
                 (Some(a), None) => a.text() == "0",

crates/biome_css_analyze/tests/specs/nursery/noUnmatchableAnbSelector/invalid.css.snap

@@ -93,6 +93,63 @@ invalid.css:4:13 lint/nursery/noUnmatchableAnbSelector ━━━━━━━━
   i For more details, see the official spec for An+B selectors.
   
 
+```
+
+```
+invalid.css:5:13 lint/nursery/noUnmatchableAnbSelector ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+  ! This selector will never match any elements.
+  
+    3 │ a:nth-child(+0n) {}
+    4 │ a:nth-child(-0n) {}
+  > 5 │ a:nth-child(0n+0) {}
+      │             ^^^^
+    6 │ a:nth-child(0n-0) {}
+    7 │ a:nth-child(-0n-0) {}
+  
+  i Avoid using An+B selectors that always evaluate to 0.
+  
+  i For more details, see the official spec for An+B selectors.
+  
+
+```
+
+```
+invalid.css:6:13 lint/nursery/noUnmatchableAnbSelector ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+  ! This selector will never match any elements.
+  
+    4 │ a:nth-child(-0n) {}
+    5 │ a:nth-child(0n+0) {}
+  > 6 │ a:nth-child(0n-0) {}
+      │             ^^^^
+    7 │ a:nth-child(-0n-0) {}
+    8 │ a:nth-child(0 of a) {}
+  
+  i Avoid using An+B selectors that always evaluate to 0.
+  
+  i For more details, see the official spec for An+B selectors.
+  
+
+```
+
+```
+invalid.css:7:13 lint/nursery/noUnmatchableAnbSelector ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+  ! This selector will never match any elements.
+  
+    5 │ a:nth-child(0n+0) {}
+    6 │ a:nth-child(0n-0) {}
+  > 7 │ a:nth-child(-0n-0) {}
+      │             ^^^^^
+    8 │ a:nth-child(0 of a) {}
+    9 │ a:nth-child(0), a:nth-child(1) {}
+  
+  i Avoid using An+B selectors that always evaluate to 0.
+  
+  i For more details, see the official spec for An+B selectors.
+  
+
 ```
 
 ```