The original paper by Wright (attached to this post, found in [1])
does actually a very good job of explaining the semantics of "match".

In particular, it says (reasonably)

(1) [An] identifier [...] matches anything, and binds a variable of
this name to the matching value in the body [!].

(2) [...] The predicate expression is bound in the same scope as the
match expression, ie, free variables in predicate are not bound by
pattern variables.

--

[1] https://legacy.cs.indiana.edu/scheme-repository/code.match.html

Am Di., 1. Sept. 2020 um 11:25 Uhr schrieb Marc Nieper-Wißkirchen
<xxxxxx@nieper-wisskirchen.de>:
>
> Sorry, typo on my side.
>
> My example (corrected) has meant to be
>
> (match '1 ((and odd? (? odd?)) odd?))
>
>
> Am Di., 1. Sept. 2020 um 11:21 Uhr schrieb Felix Thibault
> <xxxxxx@gmail.com>:
> >
> >
> >
> > On Tue, Sep 1, 2020 at 4:35 AM Marc Nieper-Wißkirchen <xxxxxx@nieper-wisskirchen.de> wrote:
> >>
> >> In the specification section of SRFI 204, it says "identifiers will
> >> match anything, and make the corresponding binding available in the
> >> body", which I read as that the identifiers are lexically bound in an
> >> extended environment, in which the body is evaluated.
> >>
> >> The sample implementation, however, fails to respect the correct
> >> lexical scoping in some cases:
> >>
> >> (match '1 ((and odd (? odd)) odd))
> >>
> >> The expected value of this expression (and according to how match is
> >> specified in SRFI 204) is 1. The sample implementation, however, fails
> >> with an error because the binding of odd is introduced too early,
> >> namely in a scope surrounding the pattern `(? odd)` as well.
> >>
> >> To make the sample implementation do the correct thing, it has to
> >> defer all actual bindings or bind to temporary variables first.
> >>
> >> Marc
> >
> >
> > Unless I'm misunderstanding
> > (match '1 ((and odd (? odd)) odd))
> > needs a predicate like either:
> > (match '1 ((and odd (? odd?)) odd))
> > or
> > (match '1 ((and odd (? odd? odd)) odd))
> > both of which evaluate to 1