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I intend to commit the enclosed patch as 'obvious', just as soon as it has finished regtesting. I have to admit that the 'obvious' did not hit me until I had posted a patch on Bugzilla that was rather less than 'obvious':)
The copying of derived types on the derived type list wound up breaking one of the cardinal rules of the game; thou shalt not build the component declarations of pointers to other derived types because there is no guarantee that they have already been declared. (Think of a derived type with a component that points to itself.) This was not a problem until this PR came along because the gfc_derived_types list stored them, it so happened, in the right order. This particular PR disrupted that.
PR fortran/31550 * trans-types.c (copy_dt_decls_ifequal): Do not get pointer derived type components.
PR fortran/31011 * gfortran.dg/used_types_16.f90: New test.
-- Saint Augustine - "O Lord, help me to be pure, but not yet"
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