Created attachment 209780 [details]
Test case

The attached test-case uses a generic wrapper class to store an enum value as a property and later accesses it. The access statement causes valac to generate invalid code, yielding the error message "incompatible types when assigning to type ‘SomeEnum’ from type ‘gconstpointer’".

The C code in question is the following:

gconstpointer _tmp4_;
SomeEnum _tmp5_;
[...]
_tmp4_ = wrapper_get_object (enum_wrapper);
_tmp5_ = _tmp4_;
g_assert (GPOINTER_TO_INT (_tmp5_) == SOME_ENUM_FIRST);

Note that storing a raw integer value in a wrapper object works, even though the compilation yields the warning message "assignment makes integer from pointer without a cast".

As a work-around, one can resort to a simple field rather than a GObject property.