compiler: Hotfix CallFromPointer

Author: FabioLuporini

devito/symbolics/extended_sympy.py

@@ -263,6 +263,12 @@ def base(self):
     def bound_symbols(self):
         return {self.call}
 
+    @property
+    def canonical_variables(self):
+        # `call` is bound to keep it out of `free_symbols`, but it names a C
+        # call or member and therefore must not be canonicalized by SymPy
+        return {}
+
     @property
     def free_symbols(self):
         return super().free_symbols - self.bound_symbols

tests/test_symbolics.py

@@ -306,6 +306,7 @@ def test_field_from_composite():
     # Test reconstruction
     ffc3 = ffc0.func(*ffc0.args)
     assert ffc0 == ffc3
+    assert ffc1.as_dummy() == ffc1
 
     # Free symbols
     assert ffc1.free_symbols == {s}