error: this argument must be a function item --> $DIR/const-eval-select-bad.rs:7:27 | LL | const_eval_select((), || {}, || {}); | ^^^^^ | = note: expected a function item, found [closure@$DIR/const-eval-select-bad.rs:7:27: 7:29] = help: consult the documentation on `const_eval_select` for more information error: this argument must be a function item --> $DIR/const-eval-select-bad.rs:7:34 | LL | const_eval_select((), || {}, || {}); | ^^^^^ | = note: expected a function item, found [closure@$DIR/const-eval-select-bad.rs:7:34: 7:36] = help: consult the documentation on `const_eval_select` for more information error: this argument must be a function item --> $DIR/const-eval-select-bad.rs:10:27 | LL | const_eval_select((), 42, 0xDEADBEEF); | ^^ | = note: expected a function item, found {integer} = help: consult the documentation on `const_eval_select` for more information error[E0277]: expected a `FnOnce<()>` closure, found `{integer}` --> $DIR/const-eval-select-bad.rs:10:27 | LL | const_eval_select((), 42, 0xDEADBEEF); | ----------------- ^^ expected an `FnOnce<()>` closure, found `{integer}` | | | required by a bound introduced by this call | = help: the trait `FnOnce<()>` is not implemented for `{integer}` = note: wrap the `{integer}` in a closure with no arguments: `|| { /* code */ }` note: required by a bound in `const_eval_select` --> $SRC_DIR/core/src/intrinsics.rs:LL:COL error: this argument must be a function item --> $DIR/const-eval-select-bad.rs:10:31 | LL | const_eval_select((), 42, 0xDEADBEEF); | ^^^^^^^^^^ | = note: expected a function item, found {integer} = help: consult the documentation on `const_eval_select` for more information error[E0277]: expected a `FnOnce<()>` closure, found `{integer}` --> $DIR/const-eval-select-bad.rs:10:31 | LL | const_eval_select((), 42, 0xDEADBEEF); | ----------------- ^^^^^^^^^^ expected an `FnOnce<()>` closure, found `{integer}` | | | required by a bound introduced by this call | = help: the trait `FnOnce<()>` is not implemented for `{integer}` = note: wrap the `{integer}` in a closure with no arguments: `|| { /* code */ }` note: required by a bound in `const_eval_select` --> $SRC_DIR/core/src/intrinsics.rs:LL:COL error[E0271]: expected `bar` to be a fn item that returns `i32`, but it returns `bool` --> $DIR/const-eval-select-bad.rs:32:34 | LL | const_eval_select((1,), foo, bar); | ----------------- ^^^ expected `i32`, found `bool` | | | required by a bound introduced by this call | note: required by a bound in `const_eval_select` --> $SRC_DIR/core/src/intrinsics.rs:LL:COL error[E0631]: type mismatch in function arguments --> $DIR/const-eval-select-bad.rs:37:32 | LL | const fn foo(n: i32) -> i32 { | --------------------------- found signature defined here ... LL | const_eval_select((true,), foo, baz); | ----------------- ^^^ expected due to this | | | required by a bound introduced by this call | = note: expected function signature `fn(bool) -> _` found function signature `fn(i32) -> _` note: required by a bound in `const_eval_select` --> $SRC_DIR/core/src/intrinsics.rs:LL:COL error: this argument must be a `const fn` --> $DIR/const-eval-select-bad.rs:42:29 | LL | const_eval_select((1,), bar, bar); | ^^^ | = help: consult the documentation on `const_eval_select` for more information error: aborting due to 9 previous errors Some errors have detailed explanations: E0271, E0277, E0631. For more information about an error, try `rustc --explain E0271`.