Public bug reported:

On bionic, guile-2.2 has a source package, but no x86_64 build yet.  I need it 
on x86_64, so I tried it myself.
Unsurprisingly, it didn't work. 

To repeat:

sudo lxc-create -n bionic -t download

to create a bionic build system, then in there, do

sudo apt install build-essential devscripts equivs
apt source guile-2.2
cd guile-2.2-2.2.2+2
sudo mk-build-deps -i
debuild -b -uc -us

That fails with
...
wrote 
`/home/ubuntu/buggy/guile-2.2-2.2.2+2/cache/guile/ccache/2.2-LE-8-3.A/home/ubuntu/buggy/guile-2.2-2.2.2+2/test-suite/standalone/test-out-of-memory.go'
GC Warning: Failed to expand heap by 134348800 bytes
GC Warning: Failed to expand heap by 134217728 bytes
GC Warning: Out of Memory! Heap size: 1 MiB. Returning NULL!
error creating finalization thread: Cannot allocate memory
GC Warning: Failed to expand heap by 1000132608 bytes
GC Warning: Failed to expand heap by 1000001536 bytes
GC Warning: Out of Memory! Heap size: 1 MiB. Returning NULL!
GC Warning: Failed to expand heap by 499712 bytes
GC Warning: Failed to expand heap by 65536 bytes
GC Warning: Out of Memory! Heap size: 1 MiB. Returning NULL!
GC Warning: Failed to expand heap by 499712 bytes
GC Warning: Failed to expand heap by 65536 bytes
GC Warning: Out of Memory! Heap size: 1 MiB. Returning NULL!
Warning: Unwind-only `out-of-memory' exception; skipping pre-unwind handler.
FAIL: test-out-of-memory
==================================
1 of 39 tests failed
Please report to bug-gu...@gnu.org

Maybe guile expects libgc to be built with --enable-munmap, but
when I tried that, the test core dumped instead of failing.
(Adding that flag caused warnings about ABI changes, though, so who knows, 
maybe I screwed up.)

Alternately, maybe this package should simply disable that test for now, as 
http://lists.gnu.org/archive/html/guile-user/2017-11/msg00063.html indicates 
it's flaky.

** Affects: guile-2.2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1734575

Title:
  guile-2.2 FTBFS on bionic on x86_64?

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