| Walk function for inside block comment.
Self-recursive and mutually recursive with other walk functions.
- If we've reached the end of the list, return.
- If we find * /, combine it into a single Brace, and
keep the cursor on that Brace.
- If we find // or /*, split that into two Braces and keep the cursor
on the first one.
- If current brace = * /, mark the current brace as FREE,
go to the next brace, and call updateFree.
Else, mark current brace as INSIDE_BLOCK_COMMENT
and go to next brace and recur.
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