// 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
- i16::from(1i8);
- i32::from(1i8);
- i64::from(1i8);
- i16::from(1u8);
- i32::from(1u8);
- i64::from(1u8);
- u16::from(1u8);
- u32::from(1u8);
- u64::from(1u8);
- i32::from(1i16);
- i64::from(1i16);
- i32::from(1u16);
- i64::from(1u16);
- u32::from(1u16);
- u64::from(1u16);
- i64::from(1i32);
- i64::from(1u32);
- u64::from(1u32);
+ let _ = i16::from(1i8);
+ let _ = i32::from(1i8);
+ let _ = i64::from(1i8);
+ let _ = i16::from(1u8);
+ let _ = i32::from(1u8);
+ let _ = i64::from(1u8);
+ let _ = u16::from(1u8);
+ let _ = u32::from(1u8);
+ let _ = u64::from(1u8);
+ let _ = i32::from(1i16);
+ let _ = i64::from(1i16);
+ let _ = i32::from(1u16);
+ let _ = i64::from(1u16);
+ let _ = u32::from(1u16);
+ let _ = u64::from(1u16);
+ let _ = i64::from(1i32);
+ let _ = i64::from(1u32);
+ let _ = u64::from(1u32);
+
+ // Test with an expression wrapped in parens
+ let _ = u16::from(1u8 + 1u8);
+}
+
+// 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
+ }
+ }
}