Definition syntax highlighting broken for unicode and block definitions

[carrexxii]

Syntax highlighting doesn't work for indentifiers with unicode and can break definition highlighting.
Block highlighting also only works if (1) the identifier starts with a capital letter and (2) there is more than one character (but no unicode).

The var isn't highlighting correctly because the identifier starts with a unicode character.
let and const, however, do highlight correctly.

Some generic tests (not affected by var/let/const or similar for proc)