error: stripping a prefix manually --> $DIR/min_rust_version_attr.rs:142:24 | LL | assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!"); | ^^^^^^^^^^^^^^^^^^^^ | = note: `-D clippy::manual-strip` implied by `-D warnings` note: the prefix was tested here --> $DIR/min_rust_version_attr.rs:141:9 | LL | if s.starts_with("hello, ") { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the `strip_prefix` method | LL | if let Some() = s.strip_prefix("hello, ") { LL | assert_eq!(.to_uppercase(), "WORLD!"); | error: stripping a prefix manually --> $DIR/min_rust_version_attr.rs:154:24 | LL | assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!"); | ^^^^^^^^^^^^^^^^^^^^ | note: the prefix was tested here --> $DIR/min_rust_version_attr.rs:153:9 | LL | if s.starts_with("hello, ") { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the `strip_prefix` method | LL | if let Some() = s.strip_prefix("hello, ") { LL | assert_eq!(.to_uppercase(), "WORLD!"); | error: aborting due to 2 previous errors