#/SYM1/SYM2/...
reads the same as
(SYM1 SYM2 ...)
The syntax was originally added to highlight the similarity between
module names and path names, but it seems gratuitous, and breaks with
lisp tradition (where lists of symbols have often been used to denote
paths through directory trees; for example, see Scheme 48's module
system).
For Guile 1.2, the #/ syntax will be depreciated. Operationally, that
just means I'm putting notes various places discouraging people from
using it.
In 1.3, it'll generate a warning to stderr the first time it's seen.
The recommended fix to suppress the warning messages will be to
remove the #/ constructs from the source.
Guile 1.4 will no longer support the syntax.