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From: "anlauf at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/67430] reallocate lhs with overloaded assignment operators causes memory error and wrong size
Date: Wed, 02 Sep 2015 21:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67430

Harald Anlauf <anlauf at gmx dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |anlauf at gmx dot de

--- Comment #3 from Harald Anlauf <anlauf at gmx dot de> ---
(In reply to Andrew Baldwin from comment #2)
> In 7.2.1.4 of my copy of the standard it states:
> 
> "A subroutine defines the defined assignment x1 = x2 if"
> 
> ...
> 
> "(5) either
>     (a) the ranks of x1 and x2 match those of d1 and d2 or
>     (b) the subroutine is elemental, x1 and x2 are conformable, and there is
> no other subroutine that defines the assignment."

It also says:

"If d1 or d2 is an array, the shapes of x1 and x2 shall match the shapes of d1
and d2 , respectively."

This is not the case for your example.

(NAG and Crayftn also do not reallocation.)

> Since x1 and x2 are not conformable in this instance the defined assignment
> (overloaded assignment) my reading is that it should not occur.

I'm no standard expert, but (5)(a) appears to be satisfied, so the
non-conformance of x1 and x2 does not matter.

To be sure, consider posting your question on comp.lang.fortran.