fix generic_array

Author: xuhuanzy

crates/emmylua_code_analysis/src/db_index/type/types.rs

@@ -600,7 +600,18 @@ impl LuaObjectType {
 
     pub fn cast_down_array_base(&self) -> Option<LuaType> {
         if self.index_access.len() != 0 {
-            return None;
+            let mut ty = None;
+            for (key, value_type) in self.index_access.iter() {
+                if matches!(key, LuaType::Integer) {
+                    if ty.is_none() {
+                        ty = Some(LuaType::Unknown);
+                    }
+                    if let Some(t) = ty {
+                        ty = Some(TypeOps::Union.apply(&t, value_type));
+                    }
+                }
+            }
+            return ty;
         }
 
         let mut ty = LuaType::Unknown;

crates/emmylua_code_analysis/src/diagnostic/test/param_type_check_test.rs

@@ -756,4 +756,24 @@ mod test {
         "#
         ));
     }
+
+    #[test]
+    fn test_generic_array() {
+        let mut ws = VirtualWorkspace::new();
+        assert!(ws.check_code_for(
+            DiagnosticCode::ParamTypeNotMatch,
+            r#"
+            ---@class LocalTimer
+
+            ---@generic V
+            ---@param list V[]
+            ---@return integer
+            local function sort(list) end
+
+            ---@type { need_sort: true?, [integer]: LocalTimer }
+            local queue = {}
+            sort(queue)
+        "#
+        ));
+    }
 }