[PATCH] PR fortran/82992 -- Check for conflicting symbols

[Steve Kargl]

The attached patch has be regression tested on x86_64-*-freebsd.

The testcase in the PR explains what the patch does.

% cat z1.f90
subroutine sub (x)
   use iso_fortran_env, only: x => character_kinds
end
%  gfcx -c a.f90
a.f90:1:17:

    1 | subroutine sub (x)
      |                 1
    2 |    use iso_fortran_env, only: x => character_kinds
      |                               2
Error: Symbol 'x' at (1) conflicts with the rename symbol at (2)

OK to commit?

2019-08-15  Steven G. Kargl  <kargl@gcc.gnu.org>

 PR fortran/82992
 * module.c (gfc_match_use):  When renaming a module entity, search
 current namespace for conflicting symbol.

2019-08-15  Steven G. Kargl  <kargl@gcc.gnu.org>

 PR fortran/82992
 * gfortran.dg/pr71649.f90: Adjust error messages.
 * gfortran.dg/use_15.f90: Ditto.
 * gfortran.dg/use_rename_8.f90: Ditto.

-- 
Steve
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