fix #1136

Author: xuhuanzy

crates/emmylua_code_analysis/src/compilation/analyzer/doc/type_def_tags.rs

@@ -144,7 +144,7 @@ pub fn analyze_alias(analyzer: &mut DocAnalyzer, tag: LuaDocTagAlias) -> Option<
 
     if tag.get_generic_decl_list().is_some() {
         let generic_params = get_type_generic_params(analyzer, &alias_decl_id);
-        let range = analyzer.comment.get_range();
+        let range = tag.get_range();
         let scope_id = analyzer
             .type_context
             .generic_index

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

@@ -100,6 +100,22 @@ mod test {
         ));
     }
 
+    #[test]
+    fn test_adjacent_alias_generic_scope_for_mapped_type() {
+        let mut ws = VirtualWorkspace::new();
+        assert!(ws.has_no_diagnostic(
+            DiagnosticCode::InjectField,
+            r#"
+                ---@alias AA<T> true
+                ---@alias FakePartial<T> {[P in keyof T]?: T[P]; }
+
+                ---@type FakePartial<{[1]:boolean}>
+                local tmp
+                tmp[1] = nil
+            "#
+        ));
+    }
+
     #[test]
     fn test_any_key() {
         let mut ws = VirtualWorkspace::new_with_init_std_lib();