thank you Dave, syntax? is enough for the operators like #'* #'+ etc that i need to test (even if some complex syntax object are returned #f) : scheme@(guile-user)> (use-modules (system syntax)) scheme@(guile-user)> syntax? $1 = #<procedure syntax? (_)> scheme@(guile-user)> (syntax? #'(2 * 3)) $2 = #f scheme@(guile-user)> #'(2 * 3) $3 = (#<syntax:unknown file:6:3 2> #<syntax:unknown file:6:5 *> #<syntax:unknown file:6:7 3>) scheme@(guile-user)> (syntax? #'*) $4 = #t scheme@(guile-user)> (syntax *) $5 = #<syntax:unknown file:8:8 *> scheme@(guile-user)> (syntax? *) $6 = #f
regards, damien On Tue, May 14, 2024 at 1:43 AM Thompson, David <dthomps...@worcester.edu> wrote: > Hi Damien, > > On Mon, May 13, 2024 at 4:43 AM Damien Mattei <damien.mat...@gmail.com> > wrote: > > > > any idea for a predicate for syntax object in Guile/scheme like exist in > > Racket 'syntax?' ? > > This predicate is in the (system syntax) module in Guile. > > > - what is a wrapped syntax object? > > Syntax objects are part of the syntax-case procedural macro system. A > syntax object wraps a value with things like lexical context and > source location (when available). > > For example: > > scheme@(guile-user)> (call-with-input-string "(1 2 3)" read-syntax) > $16 = #<syntax:unknown file:1:0 (#<syntax:unknown file:1:1 1> > #<syntax:unknown file:1:3 2> #<syntax:unknown file:1:5 3>)> > > See 6.8.3 Support for the ‘syntax-case’ System in the manual. > > Hope this helps, > > - Dave >
