add in-comment test case for use_tree_list_err_recovery

Author: Young-Flash

crates/parser/src/grammar/items/use_item.rs

@@ -86,6 +86,11 @@ pub(crate) fn use_tree_list(p: &mut Parser<'_>) {
     assert!(p.at(T!['{']));
     let m = p.start();
 
+    // test_err use_tree_list_err_recovery
+    // use {a;
+    // use b;
+    // struct T;
+    // fn test() {}
     delimited(p, T!['{'], T!['}'], T![,], USE_TREE_LIST_RECOVERY_SET, |p: &mut Parser<'_>| {
         use_tree(p, false) || p.at_ts(USE_TREE_LIST_RECOVERY_SET)
     });

crates/parser/test_data/parser/inline/err/0026_use_tree_list_err_recovery.rast

@@ -0,0 +1,50 @@
+SOURCE_FILE
+  USE
+    USE_KW "use"
+    WHITESPACE " "
+    USE_TREE
+      USE_TREE_LIST
+        L_CURLY "{"
+        USE_TREE
+          PATH
+            PATH_SEGMENT
+              NAME_REF
+                IDENT "a"
+        ERROR
+          SEMICOLON ";"
+  WHITESPACE "\n"
+  USE
+    USE_KW "use"
+    WHITESPACE " "
+    USE_TREE
+      PATH
+        PATH_SEGMENT
+          NAME_REF
+            IDENT "b"
+    SEMICOLON ";"
+  WHITESPACE "\n"
+  STRUCT
+    STRUCT_KW "struct"
+    WHITESPACE " "
+    NAME
+      IDENT "T"
+    SEMICOLON ";"
+  WHITESPACE "\n"
+  FN
+    FN_KW "fn"
+    WHITESPACE " "
+    NAME
+      IDENT "test"
+    PARAM_LIST
+      L_PAREN "("
+      R_PAREN ")"
+    WHITESPACE " "
+    BLOCK_EXPR
+      STMT_LIST
+        L_CURLY "{"
+        R_CURLY "}"
+  WHITESPACE "\n"
+error 6: expected COMMA
+error 6: expected one of `*`, `::`, `{`, `self`, `super` or an identifier
+error 7: expected R_CURLY
+error 7: expected SEMICOLON

crates/parser/test_data/parser/inline/err/0026_use_tree_list_err_recovery.rs

@@ -0,0 +1,4 @@
+use {a;
+use b;
+struct T;
+fn test() {}