Syntax error during `make check` for Guile 2.27

[oskooi]

When building MPB from source using Guile 2.2.7 (the version installed with the precompiled binary guile-2.2-dev on Ubuntu 22.04), an error occurs during make check:

ice-9/boot-9.scm:222:17: In procedure map1:
Syntax error:
../examples/check.ctl:331:2: definition in expression context, where definitions are not allowed, 
in form (define symeigs-inv (compute-symmetries W w))

[thchr]

This is my mistake. When I was doing #134, I was compiling with Guile 3.0 or 3.1 and wasn't aware/did not remember that this syntax was disallowed on earlier versions.

I have time to look at this Friday this week or Monday next week (but if you need a fix sooner, of course, don't wait).

[thchr]

Okay, seems like the issue was very small: see #163.

I didn't check on Guile 2.27 in practice though, since I don't have that version: I'm assuming that's also not tested what is tested by CI (edit: maybe there is no CI here on the mpb repo - only meep?)

[oskooi]

maybe there is no CI here on the mpb repo - only meep?

There used to be CI for the MPB repo using Travis. Since the Python API for MPB is provided by Meep, the Meep CI using Github Actions does include a unit test. However, currently there is no test for the Scheme API for MPB. This is why this error went undetected.