[Bug c++/123871] ICE in finish_expr_stmt, at cp/semantics.cc:1174, Splicer in generic lambda allows out of bounds array access

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123871

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2026-01-29
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |mpolacek at gcc dot 
gnu.org
             Status|UNCONFIRMED                 |ASSIGNED
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Incredibly, a patch that I just pushed (r16-7140-g101f2970adc0a7) fixed this
ICE:

123871.C:8:31: error: splice argument must be an expression of type
‘std::meta::info’
    8 |         using X = [: array[100] :];
      |                      ~~~~~~~~~^

but we don't emit the diag_array_subscript diagnostic and we should.