[Bug c/88642] New: Accepts ill-formed program with invalid scalar initialization syntax.

[anders.granlund.0 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88642

            Bug ID: 88642
           Summary: Accepts ill-formed program with invalid scalar
                    initialization syntax.
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anders.granlund.0 at gmail dot com
  Target Milestone: ---

Test program (test.c):

  int main()
  {
    int x = { { 0 } };
  }

Compilation command line:

  clang prog.c -Wall -Wextra -std=c11 -pedantic-errors

Observed behaviour:

  No error message outputed. Only warning messages outputed.

Expected behaviour:

  An error message outputed.

  The initalizer  0  or  { 0 }  is valid according to 6.7.9/11, but not
  { { 0 } } .

Note:

  Clang gives the expected error message for the program.