bug#43394: DYNAMIC-LINK is unbound when using r6rs library syntax

In r6rs libraries, only r6rs is available. You need to impor whatever bindings you need from the (guile) module

-- 
  Linus Björnstam

On Mon, 14 Sep 2020, at 05:07, Guy Gastineau wrote:
> Guile version 3.0.4.38-64c894
> 
> I am on 64 bit arch linux, and I built guile3.0 from the AUR package 
> guile-git on Sep 12 2020
> https://aur.archlinux.org/guile-git.git for the PKGBUILD (the config 
> options were practically non-existent).
> 
> I am writing to modules that dynamically link.  DYNAMIC-LINK works in 
> the top level REPL, and when using DEFINE-MODULE.
> When using the r6rs library syntax DYNAMIC-LINK is considered unbound 
> and the compilation fails.
> The following is an example of the behavior with a minimally viable 
> source for reproducing the bug.
> 
> (library (fail-link (0 1))
>   (export link)
>   (import)
>   (define link dynamic-link))
> 
> What I get:
> ;;; note: source file /home/guy/guile-fail-link.scm                     
>                                               
> ;;;       newer than compiled 
> /home/guy/.cache/guile/ccache/3.0-LE-8-4.4/home/guy/guile-fail-link.scm.go              
> ;;; compiling /home/guy/guile-fail-link.scm                             
>                                               
> ;;; guile-fail-link.scm:4:2: warning: possibly unbound variable 
> `dynamic-link'                                        
> ;;; compiled 
> /home/guy/.cache/guile/ccache/3.0-LE-8-4.4/home/guy/guile-fail-link.scm.go                               
> ice-9/boot-9.scm:1669:16: In procedure raise-exception:                 
>                                               
> Unbound variable: dynamic-link
> 
> What I expect:
> ;;; note: source file /home/guy/guile-fail-link.scm                     
>                                               
> ;;;       newer than compiled 
> /home/guy/.cache/guile/ccache/3.0-LE-8-4.4/home/guy/guile-fail-link.scm.go              
> ;;; compiling /home/guy/guile-fail-link.scm                             
>                                               
> ;;; compiled 
> /home/guy/.cache/guile/ccache/3.0-LE-8-4.4/home/guy/guile-fail-link.scm.go
> 
> Additional information:
> After I load the failing library I lose a bunch of top level 
> definitions and syntax.  Like IMPORT is no longer recognized and I have 
> to `,q`
> in order to get the REPL in a usable state again.
> 
> I can just use DEFINE-MODULE, but honestly I like the r6rs syntax.  
> Even though imports between schemes differ enough (and FFI anyway)
> that none of these libraries will end up being portable, I still like 
> r6rs library syntax.
> 
> If I need to find extra information for to help you all figure out what 
> is happening, please just let me know.
> 
> Also, thank you all for your hard work.  I am excited to have this 
> snappy Guile 3 on my system now ;)
> 
> - Guy Gastineau