Build failure with latest GCC

[felixonmars]

This looks different than #3618

[ 52%] Building C object src/libponyc/CMakeFiles/libponyc.dir/expr/reference.c.o
In file included from /build/ponyc/src/ponyc-0.37.0/src/libponyc/expr/reference.c:18:
/build/ponyc/src/ponyc-0.37.0/src/libponyc/expr/reference.c: In function ‘expr_contained_in_recover’:
/build/ponyc/src/ponyc-0.37.0/src/libponyc/../common/ponyassert.h:16:23: error: this statement may fall through [-Werror=implicit-fallthrough=]
   16 |     ((expr) ? (void)0 : \
      |     ~~~~~~~~~~~~~~~~~~^~~
   17 |       ponyint_assert_fail(#expr, __FILE__, __LINE__, __func__))
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/build/ponyc/src/ponyc-0.37.0/src/libponyc/expr/reference.c:222:9: note: in expansion of macro ‘pony_assert’
  222 |         pony_assert(0);
      |         ^~~~~~~~~~~
/build/ponyc/src/ponyc-0.37.0/src/libponyc/expr/reference.c:224:7: note: here
  224 |       case TK_THIS:
      |       ^~~~

[SeanTAllen]

Can you provide the exact version of gcc you are using?

[felixonmars]

Can you provide the exact version of gcc you are using?

I am using GCC 10.2.0.

[SeanTAllen]

Thanks. Do you feel comfortable enough with C to tackle this and open a PR? If yes, it would be the quickest way to get the issue fixed.

[felixonmars]

@SeanTAllen Sure, opened as #3630