// run-rustfix
-#[warn(clippy::cast_lossless)]
-#[allow(clippy::no_effect, clippy::unnecessary_operation)]
+#![allow(clippy::no_effect, clippy::unnecessary_operation, dead_code)]
+#![warn(clippy::cast_lossless)]
+
fn main() {
// Test clippy::cast_lossless with casts to integer types
- 1i8 as i16;
- 1i8 as i32;
- 1i8 as i64;
- 1u8 as i16;
- 1u8 as i32;
- 1u8 as i64;
- 1u8 as u16;
- 1u8 as u32;
- 1u8 as u64;
- 1i16 as i32;
- 1i16 as i64;
- 1u16 as i32;
- 1u16 as i64;
- 1u16 as u32;
- 1u16 as u64;
- 1i32 as i64;
- 1u32 as i64;
- 1u32 as u64;
+ let _ = 1i8 as i16;
+ let _ = 1i8 as i32;
+ let _ = 1i8 as i64;
+ let _ = 1u8 as i16;
+ let _ = 1u8 as i32;
+ let _ = 1u8 as i64;
+ let _ = 1u8 as u16;
+ let _ = 1u8 as u32;
+ let _ = 1u8 as u64;
+ let _ = 1i16 as i32;
+ let _ = 1i16 as i64;
+ let _ = 1u16 as i32;
+ let _ = 1u16 as i64;
+ let _ = 1u16 as u32;
+ let _ = 1u16 as u64;
+ let _ = 1i32 as i64;
+ let _ = 1u32 as i64;
+ let _ = 1u32 as u64;
+
+ // Test with an expression wrapped in parens
+ let _ = (1u8 + 1u8) as u16;
+}
+
+// The lint would suggest using `f64::from(input)` here but the `XX::from` function is not const,
+// so we skip the lint if the expression is in a const fn.
+// See #3656
+const fn abc(input: u16) -> u32 {
+ input as u32
+}
+
+// Same as the above issue. We can't suggest `::from` in const fns in impls
+mod cast_lossless_in_impl {
+ struct A;
+
+ impl A {
+ pub const fn convert(x: u32) -> u64 {
+ x as u64
+ }
+ }
}