We gave up on TCP for => function syntax. I think Java reached the same conclusion.

It's really hard to retrofit TCP onto a C-like language with statements as well as expressions. At best you please only some programmers and confuse others, at a fairly high implementation cost (e.g., return from within a lambda called after its containing function deactivated).

See https://mail.mozilla.org/pipermail/es-discuss/2012-March/021... and especially https://mail.mozilla.org/pipermail/es-discuss/2012-March/021....