[Bug 11721] ash subshell vs. arithmetic bracket parsing issue

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=11721

--- Comment #3 from Denys Vlasenko <vda.linux at googlemail.com> ---
It's not obvious what "correctly" is.
For example, in C syntax, the longest sequence of chars which forms a valid
token is taken as next token - no lookahead. In this case, this rule would see
"$((" as next token.

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