error: expected identifier, found `<-`
  --> $DIR/const-expression-parameter.rs:10:19
   |
LL |     u32_identity::<-1>(); //~ ERROR expected identifier, found `<-`
   |                   ^^ expected identifier

error: expected one of `,` or `>`, found `+`
  --> $DIR/const-expression-parameter.rs:14:22
   |
LL |     u32_identity::<1 + 2>(); //~ ERROR expected one of `,` or `>`, found `+`
   |                      ^ expected one of `,` or `>` here

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

error: const generics in any position are currently unsupported
  --> $DIR/const-expression-parameter.rs:4:23
   |
LL | fn u32_identity<const X: u32>() -> u32 {
   |                       ^

error: aborting due to 3 previous errors