When you add a whitespace or a semicolon to the end of the line, it works just fine. But I think I know what causes this. Look at the string below:

"var value\(raw: i) = 6 func foo() {}"

When I input it to the CodeBlockItemListSyntax the macro generates this:

var value0 = 6
func foo() {
}

Did you see what it did? It automatically indented the code for you. It also does the same thing with the semicolon (and also escape sequences?), too:

"var value\(raw: i) = 6;func foo() {}"

Into:

var value0 = 6;
func foo() {
}

I think what CBILS doest is just stash the string literals side by side (using your input):

"var value1 = 0var value2 = 0var value3 = 0"

When swift tries to parse this it does it like so:

(var value1 = 0var) (value2 = 0var) (value3 = 0)
 ┬────────────┬───  ┬──────────┬──   ─┬────────
 |            ╰some |          ╰─some ╰ set value
 ╰─ var init.  value╰─ set value  value

And when swift tries to indent this it puts a line break between every statement (in parenthesis), so the end result becomes:

var value1 = 0var
value2 = 0var
value3 = 0

But if you make the value a string literal an instead of an integer literal it works fine. Why is that?

Because anything that has a start and an end (terminating) (e.g. () "" [] {}) has no possibility of intersecting with something (e.g. ""abc -> ("")(abc))

In short terms:

The developer for this library has forgot to put seperators between the code blocks. So put a whitespace or a semicolon at the end to fix this issue. And report the bug to the authors. :)