who start by @, but I can't color them.

The Rust lexer does not detect them as identifiers, its identifier code is:

static bool IsIdentifierStart(int ch) {
	return (IsASCII(ch) && (isalpha(ch) || ch == '_')) || !IsASCII(ch);
}

/* This isn't quite right for Unicode identifiers */
static bool IsIdentifierContinue(int ch) {
	return (IsASCII(ch) && (isalnum(ch) || ch == '_')) || !IsASCII(ch);
}

That is because Rust doesn't allow identifiers to start with @

And also, is it possible to define a coloration for every u or i followed by a number ?

That matches the definition of identifier above, so any that exist in one of the keyword lists will be styled for that list, but not any u or i followed by a random number.

but with Rust lexer and tag parser, maybe a ctag problem ?

You are running into the problem with custom types, lexers and tag parsers are intended for a specific language and will only work for a custom type to the extent that your language is the same. Colouring is not a ctags problem, but symbols in the sidebar will be.

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