[Bug c++/94100] ICE: tree check: accessed elt 1 of 'tree_vec' with 0 elts in tsubst_pack_expansion, at cp/pt.c:12765

[hstong at ca dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94100

--- Comment #2 from Hubert Tong  ---
The following ICEs in a similar fashion:
internal compiler error: tree check: accessed elt 2 of 'tree_vec' with 1 elts
in tsubst, at cp/pt.c:15334

### SOURCE:
template  struct ValListWithTypes {
  template  struct WithVals {
using TypeList = ValListWithTypes;
  };
};

template 
struct Widget;

template 
struct Widget> {
  template  struct Impl {};
};

template 
template 
struct Widget>::Impl<
typename ValListWithTypes::template WithVals> {};

int main(void) { Widget::WithVals<0>>::Impl<> impl; }

[Bug c++/94100] ICE: tree check: accessed elt 1 of 'tree_vec' with 0 elts in tsubst_pack_expansion, at cp/pt.c:12765

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94100

Marek Polacek  changed:

   What|Removed |Added

   Last reconfirmed||2020-03-09
 CC||mpolacek at gcc dot gnu.org
 Status|UNCONFIRMED |NEW
 Ever confirmed|0   |1

--- Comment #1 from Marek Polacek  ---
The ICE started with r0-128638-gb0ff7fe1d223260aea5b7dc3f36892aa57d43c77 -- a
while ago.  Before that:

94100.C:19:24: error: no matching function for call to ‘Foo::foo()’
   Foo::foo();
^