rust/tests/ui/const-generics/generic_const_exprs/unify-op-with-fn-call.stderr

error[E0741]: `Foo` must implement `ConstParamTy` to be used as the type of a const generic parameter
  --> $DIR/unify-op-with-fn-call.rs:18:29
   |
LL | struct Evaluatable<const N: Foo>;
   |                             ^^^
   |
help: add `#[derive(ConstParamTy)]` to the struct
   |
LL + #[derive(ConstParamTy)]
LL | struct Foo(u8);
   |

error[E0741]: `Foo` must implement `ConstParamTy` to be used as the type of a const generic parameter
  --> $DIR/unify-op-with-fn-call.rs:20:17
   |
LL | fn foo<const N: Foo>(a: Evaluatable<{ N + N }>) {
   |                 ^^^
   |
help: add `#[derive(ConstParamTy)]` to the struct
   |
LL + #[derive(ConstParamTy)]
LL | struct Foo(u8);
   |

error[E0741]: `Foo` must implement `ConstParamTy` to be used as the type of a const generic parameter
  --> $DIR/unify-op-with-fn-call.rs:24:17
   |
LL | fn bar<const N: Foo>() {}
   |                 ^^^
   |
help: add `#[derive(ConstParamTy)]` to the struct
   |
LL + #[derive(ConstParamTy)]
LL | struct Foo(u8);
   |

error: unconstrained generic constant
  --> $DIR/unify-op-with-fn-call.rs:30:12
   |
LL |     bar2::<{ std::ops::Add::add(N, N) }>();
   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: try adding a `where` bound
   |
LL | fn foo2<const N: usize>(a: Evaluatable2<{ N + N }>) where [(); { std::ops::Add::add(N, N) }]: {
   |                                                     +++++++++++++++++++++++++++++++++++++++++

error[E0015]: cannot call non-const operator in constants
  --> $DIR/unify-op-with-fn-call.rs:20:39
   |
LL | fn foo<const N: Foo>(a: Evaluatable<{ N + N }>) {
   |                                       ^^^^^
   |
note: impl defined here, but it is not `const`
  --> $DIR/unify-op-with-fn-call.rs:10:1
   |
LL | impl const std::ops::Add for Foo {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = note: calls in constants are limited to constant functions, tuple structs and tuple variants
help: add `#![feature(effects)]` to the crate attributes to enable
   |
LL + #![feature(effects)]
   |

error[E0015]: cannot call non-const fn `<Foo as Add>::add` in constants
  --> $DIR/unify-op-with-fn-call.rs:21:13
   |
LL |     bar::<{ std::ops::Add::add(N, N) }>();
   |             ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: calls in constants are limited to constant functions, tuple structs and tuple variants
help: add `#![feature(effects)]` to the crate attributes to enable
   |
LL + #![feature(effects)]
   |

error[E0015]: cannot call non-const fn `<usize as Add>::add` in constants
  --> $DIR/unify-op-with-fn-call.rs:30:14
   |
LL |     bar2::<{ std::ops::Add::add(N, N) }>();
   |              ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: calls in constants are limited to constant functions, tuple structs and tuple variants
help: add `#![feature(effects)]` to the crate attributes to enable
   |
LL + #![feature(effects)]
   |

error: aborting due to 7 previous errors

Some errors have detailed explanations: E0015, E0741.
For more information about an error, try `rustc --explain E0015`.