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RedHat BZ#496791 is another example of a bug I documented better in the commitids 10049EF448F5F89A278 and 10049EF493039137B14 in mksh(1).
The gist is: $(…) are not parsed recursively but by a lexer hack, namely merely looking at matching parenthesēs; this needs to go away. Until then, this bug cannot be fixed.
And while at it, ((foo); bar) subshells need to be fixed so that they are not parsed as ((…)) arithmetic expression with a failure upon encountering a sole closing parenthesis.
The mksh plans list this.
