In your open statement, || is evaluated before the comma, so your statement is parsed as open FILE, (">test.txt" || $failed_flag = 1); giving the syntax error.

Actually the  || operator also has higher precedence than the  = operator so it is parsed as open FILE, (">test.txt" || $failed_flag) = 1; which is why you get the error  Can't modify constant item in scalar assignment

In reply to Re^2: Variable assignment after logical OR by jwkrahn
in thread Variable assignment after logical OR by rq-2102

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