[Patch, Fortran] PR fortran/35840: asynchronous specifier for a data transfert statement shall be an initialization expression

[Mikael Morin]

Hi,

this patch fixes PR35840.
It takes checking code from gfc_match_init_expr to a separated function
and uses it to check exotic (non-constant, but reducible) asynchronous
specifier ("y"//"e"//trim("s  ") which reduces to "yes" was the one
reported).

This was first posted on the bugzilla, and pre-approved there.
It is regression tested.

Is this Ok ?*
Mikael.

PS : My copyright assignment should reach the FSF by the end of this
week or more probably next week.

(*) This is my first patch proposal so I'm awaiting comments about
everything (patch, Changelog, message, syntactic conventions, testcase,
...). Be very strict.



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