mirror of https://github.com/rust-lang/rust
26 lines
1005 B
Rust
26 lines
1005 B
Rust
// Emit additional suggestion to correct the trait implementation
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// on a pointer
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use std::{fmt, marker};
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struct LocalType;
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impl fmt::Display for *mut LocalType {
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//~^ ERROR only traits defined in the current crate can be implemented for arbitrary types
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//~| NOTE impl doesn't use only types from inside the current crate
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//~| NOTE `*mut LocalType` is not defined in the current crate because raw pointers are always foreign
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//~| NOTE define and implement a trait or new type instead
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//~| HELP consider introducing a new wrapper type
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "This not compile")
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}
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}
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impl<T> marker::Copy for *mut T {
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//~^ ERROR only traits defined in the current crate can be implemented for arbitrary types
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//~| NOTE impl doesn't use only types from inside the current crate
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//~| NOTE `*mut T` is not defined in the current crate because raw pointers are always foreign
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//~| NOTE define and implement a trait or new type instead
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}
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fn main() {}
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