[Bug c/69819] [4.9/5/6 Regression] ICE on invalid code on x86_64-linux-gnu in tree check: expected function_type or method_type, have array_type in function_args_iter_init, at tree.h:4536

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69819

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This fixes it but I'd like to think about this some more.

--- gcc/c/c-decl.c
+++ gcc/c/c-decl.c
@@ -4743,7 +4743,7 @@ finish_decl (tree decl, location_t init_loc, tree init,
              struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
              while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
                b_ext = b_ext->shadowed;
-             if (b_ext)
+             if (b_ext && TREE_CODE (decl) == TREE_CODE (b_ext->decl))
                {
                  if (b_ext->u.type && comptypes (b_ext->u.type, type))
                    b_ext->u.type = composite_type (b_ext->u.type, type);