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Inconsistent syntax for DO
There are three descriptions of the syntax of DO in the report. In section
4.2.4, the syntax is
(do ((<variable> <init> <step>) ...)
(<test> <expression> ...)
and the text makes it clear that (1) the <step>s are optional and (2) the
result of the form is unspecified if there are no <expression>s.
In sections 7.1.3 and 7.3, the syntax is
(do ((<variable> <init> [<step>])*)
(more or less) where <sequence> is defined as
The bug is that section 4.2.4 allows there to be no expressions after the test,
while the other two sections do not. I don't particularly care which way it
gets resolved (though I slightly prefer the section 4.2.4 version), but this
inconsistency should get fixed in R5RS.