ices/67684.sh: fixed with no errors

=== stdout ===
=== stderr ===
warning: anonymous parameters are deprecated and will be removed in the next edition
  --> <anon>:16:19
   |
16 |     fn parse_mode(&Self, Self::PartialState) {}
   |                   ^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self`
   |
   = note: `#[warn(anonymous_parameters)]` on by default
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
   = note: for more information, see issue #41686 <rust-lang/rust#41686>

warning: anonymous parameters are deprecated and will be removed in the next edition
  --> <anon>:16:26
   |
16 |     fn parse_mode(&Self, Self::PartialState) {}
   |                          ^^^^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: Self::PartialState`
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
   = note: for more information, see issue #41686 <rust-lang/rust#41686>

warning: function is never used: `expr`
  --> <anon>:26:4
   |
26 | fn expr<A>() -> impl Parser
   |    ^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: function is never used: `parse_mode_impl`
  --> <anon>:32:4
   |
32 | fn parse_mode_impl<A>()
   |    ^^^^^^^^^^^^^^^

warning: 4 warnings emitted

==============

Author: rustbot