hashbrown fails to compile on avr architectures because target_pointer_width is 16

[mutantbob]

I am porting an embedded app to AVR, and hashbrown is giving me several compile errors:

error[E0433]: failed to resolve: use of undeclared type `GroupWord`
  --> /home/thoth/.cargo/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.3.1/src/raw/generic.rs:33:18
   |
33 |     let repeat = GroupWord::from(byte);
   |                  ^^^^^^^^^ use of undeclared type `GroupWord`

error[E0425]: cannot find value `K` in this scope
  --> /home/thoth/.cargo/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.3.1/src/fx.rs:41:69
   |
41 |         self.hash = self.hash.rotate_left(5).bitxor(i).wrapping_mul(K);
   |                                                                     ^ help: a local variable with a similar name exists: `i`

it appears hashbrown has cfg checks based on target_pointer_width, but no clause cover the 16-bit pointer case (AVR has 16-bit pointers)

[mutantbob]

This problem appears to be fixed in recent versions. hashbrown was a dependency of another crate that was locked to ^0.3

[mutantbob]

OK, the K is fixed, but GroupWord seems to still be missing.