Fix errors when regex module is available (thx @singron)

Close #20

Co-authored-by: singron <eculperic@gmail.com>

.travis.yml

@@ -13,9 +13,14 @@ matrix:
     - python: 3.8-dev
       dist: xenial
       sudo: true
+env:
+  matrix:
+    - PYTHON_REGEX=false
+    - PYTHON_REGEX=true
 install:
   - pip install pip --upgrade
   - pip install -e .[dev,test]
+  - if [[ "$PYTHON_REGEX" == "true" ]]; then pip install regex; fi;
   - pip install coveralls
 script:
   - coverage run --source=rebulk setup.py test

rebulk/loose.py

@@ -56,7 +56,7 @@ def call(function, *args, **kwargs):
     :rtype: object
     """
     func = constructor_args if isclass(function) else function_args
-    call_args, call_kwargs = func(function, *args, **kwargs)
+    call_args, call_kwargs = func(function, *args, ignore_unused=True, **kwargs)  # @see #20
     return function(*call_args, **call_kwargs)