[Bug c++/84576] New: g++: internal compiler error: Segmentation fault (program cc1plus)

[vegard.nossum at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84576

            Bug ID: 84576
           Summary: g++: internal compiler error: Segmentation fault
                    (program cc1plus)
           Product: gcc
           Version: 7.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vegard.nossum at gmail dot com
  Target Milestone: ---

The following is obviously not a valid C++ program but crashes the compiler:

a(){[](class{

Output:

<source>:1:3: error: ISO C++ forbids declaration of 'a' with no type
[-fpermissive]
 a(){[](class{
   ^
<source>: In function 'int a()':
<source>:1:13: error: types may not be defined in parameter types
 a(){[](class{
             ^
<source>:1:13: error: expected '}' at end of input
<source>:1:13: error: expected ',' or '...' at end of input
<source>:1:13: error: expected ')' at end of input
g++: internal compiler error: Segmentation fault (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 4

I used C-Reduce on a bigger program to find a smaller test case.