warning: the feature `const_generics` is incomplete and may cause the compiler to crash
  --> $DIR/struct-with-invalid-const-param.rs:1:12
   |
LL | #![feature(const_generics)]
   |            ^^^^^^^^^^^^^^

error[E0573]: expected type, found const parameter `C`
  --> $DIR/struct-with-invalid-const-param.rs:4:23
   |
LL | struct S<const C: u8>(C);
   |                       ^ help: a struct with a similar name exists: `S`

error: aborting due to previous error