{"ast_node_type":"function","tokens":[{"end":89,"kind":"keyword","start":0,"text":"assert_matches(\"Foo{$a,"}]}
    assert_matches("Foo{$a, $b}", "struct Foo {} fn f() {Foo{1, 2,};}", &["Foo{1, 2,}"]);
    assert_matches("foo($a, $b)", "fn foo() {} fn f() {foo(1, 2,);}", &["foo(1, 2,)"]);