error: calling `to_string` on `&&str` --> $DIR/inefficient_to_string.rs:12:21 | LL | let _: String = rrstr.to_string(); | ^^^^^^^^^^^^^^^^^ help: try dereferencing the receiver: `(*rrstr).to_string()` | note: lint level defined here --> $DIR/inefficient_to_string.rs:2:9 | LL | #![deny(clippy::inefficient_to_string)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = help: `&str` implements `ToString` through a slower blanket impl, but `str` has a fast specialization of `ToString` error: calling `to_string` on `&&&str` --> $DIR/inefficient_to_string.rs:13:21 | LL | let _: String = rrrstr.to_string(); | ^^^^^^^^^^^^^^^^^^ help: try dereferencing the receiver: `(**rrrstr).to_string()` | = help: `&&str` implements `ToString` through a slower blanket impl, but `str` has a fast specialization of `ToString` error: calling `to_string` on `&&std::string::String` --> $DIR/inefficient_to_string.rs:21:21 | LL | let _: String = rrstring.to_string(); | ^^^^^^^^^^^^^^^^^^^^ help: try dereferencing the receiver: `(*rrstring).to_string()` | = help: `&std::string::String` implements `ToString` through a slower blanket impl, but `std::string::String` has a fast specialization of `ToString` error: calling `to_string` on `&&&std::string::String` --> $DIR/inefficient_to_string.rs:22:21 | LL | let _: String = rrrstring.to_string(); | ^^^^^^^^^^^^^^^^^^^^^ help: try dereferencing the receiver: `(**rrrstring).to_string()` | = help: `&&std::string::String` implements `ToString` through a slower blanket impl, but `std::string::String` has a fast specialization of `ToString` error: calling `to_string` on `&&std::borrow::Cow<'_, str>` --> $DIR/inefficient_to_string.rs:30:21 | LL | let _: String = rrcow.to_string(); | ^^^^^^^^^^^^^^^^^ help: try dereferencing the receiver: `(*rrcow).to_string()` | = help: `&std::borrow::Cow<'_, str>` implements `ToString` through a slower blanket impl, but `std::borrow::Cow<'_, str>` has a fast specialization of `ToString` error: calling `to_string` on `&&&std::borrow::Cow<'_, str>` --> $DIR/inefficient_to_string.rs:31:21 | LL | let _: String = rrrcow.to_string(); | ^^^^^^^^^^^^^^^^^^ help: try dereferencing the receiver: `(**rrrcow).to_string()` | = help: `&&std::borrow::Cow<'_, str>` implements `ToString` through a slower blanket impl, but `std::borrow::Cow<'_, str>` has a fast specialization of `ToString` error: aborting due to 6 previous errors