error[E0606]: casting `*const U` as `*const V` is invalid --> $DIR/cast-rfc0401.rs:3:5 | LL | u as *const V | ^^^^^^^^^^^^^ | = note: vtable kinds may not match error[E0606]: casting `*const U` as `*const str` is invalid --> $DIR/cast-rfc0401.rs:8:5 | LL | u as *const str | ^^^^^^^^^^^^^^^ | = note: vtable kinds may not match error[E0609]: no field `f` on type `fn() {main}` --> $DIR/cast-rfc0401.rs:65:18 | LL | let _ = main.f as *const u32; | ^ error[E0605]: non-primitive cast: `*const u8` as `&u8` --> $DIR/cast-rfc0401.rs:29:13 | LL | let _ = v as &u8; | ^^^^^^^^ | = note: an `as` expression can only be used to convert between primitive types. Consider using the `From` trait error[E0605]: non-primitive cast: `*const u8` as `E` --> $DIR/cast-rfc0401.rs:30:13 | LL | let _ = v as E; | ^^^^^^ | = note: an `as` expression can only be used to convert between primitive types. Consider using the `From` trait error[E0605]: non-primitive cast: `*const u8` as `fn()` --> $DIR/cast-rfc0401.rs:31:13 | LL | let _ = v as fn(); | ^^^^^^^^^ | = note: an `as` expression can only be used to convert between primitive types. Consider using the `From` trait error[E0605]: non-primitive cast: `*const u8` as `(u32,)` --> $DIR/cast-rfc0401.rs:32:13 | LL | let _ = v as (u32,); | ^^^^^^^^^^^ | = note: an `as` expression can only be used to convert between primitive types. Consider using the `From` trait error[E0605]: non-primitive cast: `std::option::Option<&*const u8>` as `*const u8` --> $DIR/cast-rfc0401.rs:33:13 | LL | let _ = Some(&v) as *const u8; | ^^^^^^^^^^^^^^^^^^^^^ | = note: an `as` expression can only be used to convert between primitive types. Consider using the `From` trait error[E0606]: casting `*const u8` as `f32` is invalid --> $DIR/cast-rfc0401.rs:35:13 | LL | let _ = v as f32; | ^^^^^^^^ error[E0606]: casting `fn() {main}` as `f64` is invalid --> $DIR/cast-rfc0401.rs:36:13 | LL | let _ = main as f64; | ^^^^^^^^^^^ error[E0606]: casting `&*const u8` as `usize` is invalid --> $DIR/cast-rfc0401.rs:37:13 | LL | let _ = &v as usize; | ^^^^^^^^^^^ | = help: cast through a raw pointer first error[E0606]: casting `f32` as `*const u8` is invalid --> $DIR/cast-rfc0401.rs:38:13 | LL | let _ = f as *const u8; | ^^^^^^^^^^^^^^ error[E0054]: cannot cast as `bool` --> $DIR/cast-rfc0401.rs:39:13 | LL | let _ = 3_i32 as bool; | ^^^^^^^^^^^^^ help: compare with zero instead: `3_i32 != 0` error[E0054]: cannot cast as `bool` --> $DIR/cast-rfc0401.rs:40:13 | LL | let _ = E::A as bool; | ^^^^^^^^^^^^ unsupported cast error[E0604]: only `u8` can be cast as `char`, not `u32` --> $DIR/cast-rfc0401.rs:41:13 | LL | let _ = 0x61u32 as char; | ^^^^^^^^^^^^^^^ error[E0606]: casting `bool` as `f32` is invalid --> $DIR/cast-rfc0401.rs:43:13 | LL | let _ = false as f32; | ^^^^^^^^^^^^ | = help: cast through an integer first error[E0606]: casting `E` as `f32` is invalid --> $DIR/cast-rfc0401.rs:44:13 | LL | let _ = E::A as f32; | ^^^^^^^^^^^ | = help: cast through an integer first error[E0606]: casting `char` as `f32` is invalid --> $DIR/cast-rfc0401.rs:45:13 | LL | let _ = 'a' as f32; | ^^^^^^^^^^ | = help: cast through an integer first error[E0606]: casting `bool` as `*const u8` is invalid --> $DIR/cast-rfc0401.rs:47:13 | LL | let _ = false as *const u8; | ^^^^^^^^^^^^^^^^^^ error[E0606]: casting `E` as `*const u8` is invalid --> $DIR/cast-rfc0401.rs:48:13 | LL | let _ = E::A as *const u8; | ^^^^^^^^^^^^^^^^^ error[E0606]: casting `char` as `*const u8` is invalid --> $DIR/cast-rfc0401.rs:49:13 | LL | let _ = 'a' as *const u8; | ^^^^^^^^^^^^^^^^ error[E0606]: casting `usize` as `*const [u8]` is invalid --> $DIR/cast-rfc0401.rs:51:13 | LL | let _ = 42usize as *const [u8]; | ^^^^^^^^^^^^^^^^^^^^^^ error[E0607]: cannot cast thin pointer `*const u8` to fat pointer `*const [u8]` --> $DIR/cast-rfc0401.rs:52:13 | LL | let _ = v as *const [u8]; | ^^^^^^^^^^^^^^^^ error[E0606]: casting `&dyn Foo` as `*const str` is invalid --> $DIR/cast-rfc0401.rs:54:13 | LL | let _ = foo as *const str; | ^^^^^^^^^^^^^^^^^ error[E0606]: casting `&dyn Foo` as `*mut str` is invalid --> $DIR/cast-rfc0401.rs:55:13 | LL | let _ = foo as *mut str; | ^^^^^^^^^^^^^^^ error[E0606]: casting `fn() {main}` as `*mut str` is invalid --> $DIR/cast-rfc0401.rs:56:13 | LL | let _ = main as *mut str; | ^^^^^^^^^^^^^^^^ error[E0606]: casting `&f32` as `*mut f32` is invalid --> $DIR/cast-rfc0401.rs:57:13 | LL | let _ = &f as *mut f32; | ^^^^^^^^^^^^^^ error[E0606]: casting `&f32` as `*const f64` is invalid --> $DIR/cast-rfc0401.rs:58:13 | LL | let _ = &f as *const f64; | ^^^^^^^^^^^^^^^^ error[E0606]: casting `*const [i8]` as `usize` is invalid --> $DIR/cast-rfc0401.rs:59:13 | LL | let _ = fat_sv as usize; | ^^^^^^^^^^^^^^^ | = help: cast through a thin pointer first error[E0606]: casting `*const dyn Foo` as `*const [u16]` is invalid --> $DIR/cast-rfc0401.rs:68:13 | LL | let _ = cf as *const [u16]; | ^^^^^^^^^^^^^^^^^^ | = note: vtable kinds may not match error[E0606]: casting `*const dyn Foo` as `*const dyn Bar` is invalid --> $DIR/cast-rfc0401.rs:69:13 | LL | let _ = cf as *const dyn Bar; | ^^^^^^^^^^^^^^^^^^^^ | = note: vtable kinds may not match error[E0277]: the size for values of type `[u8]` cannot be known at compilation time --> $DIR/cast-rfc0401.rs:53:13 | LL | let _ = fat_v as *const dyn Foo; | ^^^^^ doesn't have a size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `[u8]` = note: to learn more, visit = note: required for the cast to the object type `dyn Foo` error[E0277]: the size for values of type `str` cannot be known at compilation time --> $DIR/cast-rfc0401.rs:62:13 | LL | let _ = a as *const dyn Foo; | ^ doesn't have a size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `str` = note: to learn more, visit = note: required for the cast to the object type `dyn Foo` error[E0606]: casting `&{float}` as `f32` is invalid --> $DIR/cast-rfc0401.rs:71:30 | LL | vec![0.0].iter().map(|s| s as f32).collect::>(); | -^^^^^^^ | | | cannot cast `&{float}` as `f32` | help: dereference the expression: `*s` error: aborting due to 34 previous errors Some errors have detailed explanations: E0054, E0277, E0604, E0605, E0606, E0607, E0609. For more information about an error, try `rustc --explain E0054`.