This now tests the interface between scan_lists and the comment functions.
* test/src/syntax-tests.el (syntax-br-comments): New macro.
({-in, ;-in, /*-in): Set parse-sexp-ignore-comments to t.
(top level): Add 15 tests for comments inside brace lists.
* test/data/syntax-comments.txt (top level): Amend some test fragments.