Do not reparse token tree when it is not delimited by braces

crates/libsyntax2/src/lib.rs

@@ -149,7 +149,7 @@ fn reparser(node: SyntaxNodeRef) -> Option<fn(&mut Parser)> {
             MATCH_ARM_LIST => grammar::match_arm_list,
             USE_TREE_LIST => grammar::use_tree_list,
             EXTERN_ITEM_LIST => grammar::extern_item_list,
-            TOKEN_TREE => grammar::token_tree,
+            TOKEN_TREE if node.first_child().unwrap().kind() == L_CURLY => grammar::token_tree,
             ITEM_LIST => {
                 let parent = node.parent().unwrap();
                 match parent.kind() {

crates/libsyntax2/tests/test/main.rs

@@ -85,6 +85,11 @@ pub enum A {
 foo!{a, b<|><|> d}
 ", ", c[3]");
     do_check(r"
+fn foo() {
+    vec![<|><|>]
+}
+", "123");
+    do_check(r"
 extern {
     fn<|>;<|>
 }