[Bug testsuite/126708] New: [17 Regression] attr-callback.c failures

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126708

            Bug ID: 126708
           Summary: [17 Regression] attr-callback.c failures
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

I see
+FAIL: gcc.dg/attr-callback.c  (test for errors, line 52)
+FAIL: gcc.dg/attr-callback.c  (test for errors, line 56)
+FAIL: gcc.dg/attr-callback.c  (test for errors, line 60)
+FAIL: gcc.dg/attr-callback.c (test for excess errors)
on both x86_64-linux and i686-linux.
The excess errors are
Excess errors:
/home/jakub/src/gcc/gcc/testsuite/gcc.dg/attr-callback.c:52:1: error: argument
type at index -2 is not compatible with callback argument type at index 1
/home/jakub/src/gcc/gcc/testsuite/gcc.dg/attr-callback.c:60:1: error: callback
function position out of range
but no diagnostics at all on line 56.