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bug#49452: Confusing behavior with (include) used in file in GUILE_LOAD_

From: Vijay Marupudi
Subject: bug#49452: Confusing behavior with (include) used in file in GUILE_LOAD_PATH
Date: Tue, 6 Jul 2021 19:31:38 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

Hello all,

It is unclear to me what the intended behavior for (include
"filename.scm") is, so I'm sending an email about this potential bug.

The Local Inclusion docs
seem to state that relative paths are found relative to the file that
included them.

> If file-name is a relative path, it is searched for relative to the
> path that contains the file that the include form appears in.

So if I have a file "/libraries/libname/main.scm" than has (include
"./helpers.scm"), then the file "/libraries/libname/helpers.scm"
*should* (I think) be imported.

But this does not seem to work if "/libraries" is in the GUILE_LOAD_PATH
and my current working directory is somewhere else, say "/home/user" and
I'm running "/home/user/program.scm" that imports the (libname main)
library from "/libraries". Then Guile seems to try to include the
"libname/helpers.scm" file from the current directory, which does not

Conversations with leoprikler in IRC have revealed to me that
call-with-include-port is the function responsible for this behavior
`syntax-source` returns a file path relative to the load path, and
include tries to use that path to open a file relative to the current
working directory.

In Guile's bug guidelines
to me this fits

* Whenever documentation and actual behavior differ, you have certainly
  found a bug, either in the documentation or in the program.

and potentially

* When some part of the documentation is not clear and does not make
  sense to you even after re-reading the section, it is a bug.

I believe this is a bug, but I may be wrong, so emailing to clarify.
Thank you!

Vijay Marupudi
PhD Student in Human Centered-Computing
Georgia Institute of Technology

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