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Program-vicinity is typically used to load pieces of programs at what
in Common-Lisp is called compile-time. But program-vicinity is also
used at run-time for locating the software license or help text, for
That's not what srfi-59.html says:
For a compiled system (with multiple files) this would be the
directory where the object or executable files are.
We would like to be able to call
program-vicinity at any point in the code and have it return the same
value as a top-level-captured vicinity. But to have it evaluated
during the load would require it be a read-syntax, wouldn't it?
It can be regular syntax *iff* the Scheme reader annotates the
resulting forms with line-number information, in some way or other.
Some Schemes do - at least Chez Scheme, PLT Scheme, and Kawa.
Any Scheme that can provide error diagnostics with a line-number
needs some way of doing this.
Must source-vicinity be distinct from program-vcinity?
Perhaps not, depending on how it is defined.
(define (f) (source-vicinity))
(define v (f))
What is the value of v? It should return "f.scm".
I do believe this is useful, for diagnostics.
If you replace source-vicinity by program-vicinity, and the
latter is defined as "Returns the vicinity of the currently
loading Scheme code" then the result would be "g.scm".
Is that useful? I don't know.
If only one of these results is useful, then you can combine