https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117371
--- Comment #3 from Gaius Mulley <gaius at gcc dot gnu.org> --- Created attachment 59604 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59604&action=edit Proposed fix Thanks for the bug report. The error location was missing and here is a proposed fix. All language dialects expect the FOR loop increment expression to be constant (which was not enforced prior to the patch), now fixed. The result from gcc-15 with the patch is: $ gm2 primes.mod primes.mod:18:48: error: In procedure ‘Compute_Primes’: the FOR loop BY expression must be constant, the expression ‘k’ is variable 18 | FOR m := k * k TO HIGH (is_prime) BY k DO (* line 20 *) | ^ primes.mod:8:6: error: variable declaration for ‘k’ 8 | k, m : CARDINAL; (* line 10 *) | ^~~~~~~~~~~~~~~
