{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"assert_matches(\"Foo"}]}
    assert_matches("Foo {$a: $b, $c: $d}", code, &["Foo {bar: 1, baz: 2}"]);
    // Now with placeholders for all parts of the struct.
    assert_matches("Foo {}", "struct Foo {} fn f() {Foo {}}", &["Foo {}"]);