Fix SIMD doctests, and run SIMD doctests at each commit.

SIMD.py

@@ -128,7 +128,8 @@ def lookup_rational(arg):
         return arg
 
     if map_sym_to_rat is None:
-        expr, map_sym_to_rat = cse_preprocess(expr)
+        cse_preprocessed_expr_list, map_sym_to_rat = cse_preprocess(expr)
+        expr = cse_preprocessed_expr_list[0]
 
     map_rat_to_sym = {map_sym_to_rat[v]:v for v in map_sym_to_rat}
 

UnitTesting/run_NRPy_UnitTests.sh

@@ -55,7 +55,7 @@ add_test WeylScal4NRPy/tests/test_WeylScal4NRPy.py
 # TODO: add your tests here
 echo "Starting doctest unit tests!"
 failed_unittest=0
-for file in expr_tree.py indexedexp.py loop.py functional.py finite_difference_helpers.py assert_equal.py sugar.py; do
+for file in expr_tree.py indexedexp.py loop.py functional.py finite_difference_helpers.py assert_equal.py sugar.py SIMD.py; do
     echo Running doctest on file: $file
     $PYTHONEXEC -m doctest $file
     if [ $? == 1 ]