Fixes a regression introduced in
c2dcff41c2, whereby many tests in
'tests/packages.scm' would trigger a syntax error due to duplicate field
intializers in forms like:
(dummy-package "foo" (version "0"))
* guix/tests.scm (dummy-package, dummy-origin): Rewrite to inherit from
a base record. This restores the semantics from before
c2dcff41c2.
* tests/services.scm ("instantiate-missing-services, indirect"): Remove
duplicate 'extensions' field.
2c5ee9bba4