63 lines
1.3 KiB
Rust
63 lines
1.3 KiB
Rust
// run-pass
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// Test that all coercions can actually be done using casts (modulo the lints).
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#![allow(trivial_casts, trivial_numeric_casts)]
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trait Foo {
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fn foo(&self) {}
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}
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pub struct Bar;
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impl Foo for Bar {}
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pub fn main() {
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// Numeric
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let _ = 42_i32 as i32;
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let _ = 42_u8 as u8;
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// & to * pointers
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let x: &u32 = &42;
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let _ = x as *const u32;
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let x: &mut u32 = &mut 42;
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let _ = x as *mut u32;
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// unsize array
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let x: &[u32; 3] = &[42, 43, 44];
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let _ = x as &[u32];
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let _ = x as *const [u32];
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let x: &mut [u32; 3] = &mut [42, 43, 44];
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let _ = x as &mut [u32];
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let _ = x as *mut [u32];
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let x: Box<[u32; 3]> = Box::new([42, 43, 44]);
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let _ = x as Box<[u32]>;
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// unsize trait
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let x: &Bar = &Bar;
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let _ = x as &dyn Foo;
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let _ = x as *const dyn Foo;
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let x: &mut Bar = &mut Bar;
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let _ = x as &mut dyn Foo;
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let _ = x as *mut dyn Foo;
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let x: Box<Bar> = Box::new(Bar);
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let _ = x as Box<dyn Foo>;
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// functions
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fn baz(_x: i32) {}
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let _ = &baz as &dyn Fn(i32);
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let x = |_x: i32| {};
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let _ = &x as &dyn Fn(i32);
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}
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// subtyping
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pub fn test_subtyping<'a, 'b: 'a>(a: &'a Bar, b: &'b Bar) {
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let _ = a as &'a Bar;
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let _ = b as &'a Bar;
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let _ = b as &'b Bar;
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}
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