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Suggest using `as_ref` on `*const T`

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estebank committed Jun 1, 2019
1 parent 7840a0b commit eb73b73b8d50b29658d87670670d939746b2d00c
@@ -324,6 +324,11 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
);
}
}
if let ty::RawPtr(_) = &actual.sty {
err.note("try using `<*const T>::as_ref()` to get a reference to the \
type behind the pointer: https://doc.rust-lang.org/std/\
primitive.pointer.html#method.as_ref");
}
err
}
} else {
@@ -0,0 +1,5 @@
fn main() {
let x = 8u8;
let z: *const u8 = &x;
println!("{}", z.to_string()); //~ ERROR E0599
}
@@ -0,0 +1,13 @@
error[E0599]: no method named `to_string` found for type `*const u8` in the current scope
--> $DIR/issue-21596.rs:4:22
|
LL | println!("{}", z.to_string());
| ^^^^^^^^^
|
= note: try using `<*const T>::as_ref()` to get a reference to the type behind the pointer: https://doc.rust-lang.org/std/primitive.pointer.html#method.as_ref
= note: the method `to_string` exists but the following trait bounds were not satisfied:
`*const u8 : std::string::ToString`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.

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