[Bug c++/123595] New: [16 Regression] ICE in cp_parser_expression_statement, at cp/parser.cc:14015

[jirehguo at tju dot edu.cn via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123595

            Bug ID: 123595
           Summary: [16 Regression] ICE in cp_parser_expression_statement,
                    at cp/parser.cc:14015
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jirehguo at tju dot edu.cn
  Target Milestone: ---

Compiler Explorer: https://godbolt.org/z/addME546a
The following invalid c++ code crash gcc trunk.
GCC 13,14,15 with checking is fine.

Code:
```cpp
template <typename T> class A {
public:
  T data;
  template <typename U> void set(U *value) {
    data = reinterpret_cast<T *>(value);
  }
};

template <auto = [] {
  struct B {};
  A<B> a;
  a.set(new B());
}>
```

Stack dump:
```
<source>: In lambda function:
<source>:12:16: internal compiler error: in cp_parser_expression_statement, at
cp/parser.cc:14016
   12 |   a.set(new B());
      |                ^
0x292a498 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
        ???:0
0x291f25b internal_error(char const*, ...)
        ???:0
0xb1670c fancy_abort(char const*, int, char const*)
        ???:0
0xd58163 c_parse_file()
        ???:0
0xec9d69 c_common_parse_file()
        ???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1
```