95 lines
2.5 KiB
Rust
95 lines
2.5 KiB
Rust
#![warn(clippy::fn_to_numeric_cast_any)]
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#![allow(clippy::fn_to_numeric_cast, clippy::fn_to_numeric_cast_with_truncation)]
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//@no-rustfix
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fn foo() -> u8 {
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0
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}
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fn generic_foo<T>(x: T) -> T {
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x
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}
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trait Trait {
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fn static_method() -> u32 {
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2
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}
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}
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struct Struct;
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impl Trait for Struct {}
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fn fn_pointer_to_integer() {
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let _ = foo as i8;
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//~^ ERROR: casting function pointer `foo` to `i8`
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//~| NOTE: `-D clippy::fn-to-numeric-cast-any` implied by `-D warnings`
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let _ = foo as i16;
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//~^ ERROR: casting function pointer `foo` to `i16`
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let _ = foo as i32;
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//~^ ERROR: casting function pointer `foo` to `i32`
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let _ = foo as i64;
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//~^ ERROR: casting function pointer `foo` to `i64`
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let _ = foo as i128;
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//~^ ERROR: casting function pointer `foo` to `i128`
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let _ = foo as isize;
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//~^ ERROR: casting function pointer `foo` to `isize`
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let _ = foo as u8;
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//~^ ERROR: casting function pointer `foo` to `u8`
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let _ = foo as u16;
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//~^ ERROR: casting function pointer `foo` to `u16`
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let _ = foo as u32;
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//~^ ERROR: casting function pointer `foo` to `u32`
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let _ = foo as u64;
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//~^ ERROR: casting function pointer `foo` to `u64`
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let _ = foo as u128;
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//~^ ERROR: casting function pointer `foo` to `u128`
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let _ = foo as usize;
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//~^ ERROR: casting function pointer `foo` to `usize`
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}
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fn static_method_to_integer() {
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let _ = Struct::static_method as usize;
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//~^ ERROR: casting function pointer `Struct::static_method` to `usize`
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}
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fn fn_with_fn_arg(f: fn(i32) -> u32) -> usize {
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f as usize
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//~^ ERROR: casting function pointer `f` to `usize`
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}
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fn fn_with_generic_static_trait_method<T: Trait>() -> usize {
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T::static_method as usize
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//~^ ERROR: casting function pointer `T::static_method` to `usize`
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}
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fn closure_to_fn_to_integer() {
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let clos = |x| x * 2_u32;
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let _ = (clos as fn(u32) -> u32) as usize;
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//~^ ERROR: casting function pointer `(clos as fn(u32) -> u32)` to `usize`
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}
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fn fn_to_raw_ptr() {
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let _ = foo as *const ();
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//~^ ERROR: casting function pointer `foo` to `*const ()`
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}
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fn cast_fn_to_self() {
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// Casting to the same function pointer type should be permitted.
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let _ = foo as fn() -> u8;
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}
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fn cast_generic_to_concrete() {
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// Casting to a more concrete function pointer type should be permitted.
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let _ = generic_foo as fn(usize) -> usize;
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}
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fn cast_closure_to_fn() {
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// Casting a closure to a function pointer should be permitted.
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let id = |x| x;
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let _ = id as fn(usize) -> usize;
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}
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fn main() {}
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