https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119139
--- Comment #4 from Iain Buclaw <ibuclaw at gcc dot gnu.org> ---
The D front-end doesn't set TREE_STATIC on the `__result` variable, it's
gcc/gimplify.cc at this location:
```
/* If a const aggregate variable is being initialized, then it
should never be a lose to promote the variable to be static. */
if (valid_const_initializer
&& num_nonzero_elements > 1
&& TREE_READONLY (object)
&& VAR_P (object)
&& !DECL_REGISTER (object)
&& (flag_merge_constants >= 2 || !TREE_ADDRESSABLE (object)
|| DECL_MERGEABLE (object))
/* For ctors that have many repeated nonzero elements
represented through RANGE_EXPRs, prefer initializing
those through runtime loops over copies of large amounts
of data from readonly data section. */
&& (num_unique_nonzero_elements
> num_nonzero_elements / unique_nonzero_ratio
|| ((unsigned HOST_WIDE_INT) int_size_in_bytes (type)
<= (unsigned HOST_WIDE_INT) min_unique_size)))
{
if (notify_temp_creation)
return GS_ERROR;
DECL_INITIAL (object) = ctor;
TREE_STATIC (object) = 1; // <---
```
