feat: implement 2024 Style Edition for expr overflows

src/bin/main.rs

@@ -915,4 +915,36 @@ mod test {
         let config = get_config(config_file, Some(options));
         assert_eq!(config.style_edition(), StyleEdition::Edition2021);
     }
+
+    #[nightly_only_test]
+    #[test]
+    fn correct_defaults_for_style_edition_loaded() {
+        let mut options = GetOptsOptions::default();
+        options.style_edition = Some(StyleEdition::Edition2024);
+        let config = get_config(None, Some(options));
+        assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        assert_eq!(config.overflow_delimited_expr(), true);
+    }
+
+    #[nightly_only_test]
+    #[test]
+    fn style_edition_defaults_overridden_from_config() {
+        let options = GetOptsOptions::default();
+        let config_file = Some(Path::new("tests/config/style-edition/overrides"));
+        let config = get_config(config_file, Some(options));
+        assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        assert_eq!(config.overflow_delimited_expr(), false);
+    }
+
+    #[nightly_only_test]
+    #[test]
+    fn style_edition_defaults_overridden_from_cli() {
+        let mut options = GetOptsOptions::default();
+        let config_file = Some(Path::new("tests/config/style-edition/just-style-edition"));
+        options.inline_config =
+            HashMap::from([("overflow_delimited_expr".to_owned(), "false".to_owned())]);
+        let config = get_config(config_file, Some(options));
+        assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        assert_eq!(config.overflow_delimited_expr(), false);
+    }
 }

src/config/mod.rs

@@ -828,7 +828,7 @@ binop_separator = "Front"
 remove_nested_parens = true
 combine_control_expr = true
 short_array_element_width_threshold = 10
-overflow_delimited_expr = false
+overflow_delimited_expr = true
 struct_field_align_threshold = 0
 enum_discrim_align_threshold = 0
 match_arm_blocks = true

src/config/options.rs

@@ -627,7 +627,7 @@ config_option_with_style_edition_default!(
     RemoveNestedParens, bool, _ => true;
     CombineControlExpr, bool, _ => true;
     ShortArrayElementWidthThreshold, usize, _ => 10;
-    OverflowDelimitedExpr, bool, _ => false;
+    OverflowDelimitedExpr, bool, Edition2024 => true, _ => false;
     StructFieldAlignThreshold, usize, _ => 0;
     EnumDiscrimAlignThreshold, usize, _ => 0;
     MatchArmBlocks, bool, _ => true;