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suggest fix for attempted integer identifier in patterns
[rust.git] / tests / ui / consts / issue-73976-monomorphic.rs
1 // check-pass
2 //
3 // This test is complement to the test in issue-73976-polymorphic.rs.
4 // In that test we ensure that polymorphic use of type_id and type_name in patterns
5 // will be properly rejected. This test will ensure that monomorphic use of these
6 // would not be wrongly rejected in patterns.
7
8 #![feature(const_type_id)]
9 #![feature(const_type_name)]
10
11 use std::any::{self, TypeId};
12
13 pub struct GetTypeId<T>(T);
14
15 impl<T: 'static> GetTypeId<T> {
16     pub const VALUE: TypeId = TypeId::of::<T>();
17 }
18
19 const fn check_type_id<T: 'static>() -> bool {
20     matches!(GetTypeId::<T>::VALUE, GetTypeId::<usize>::VALUE)
21 }
22
23 pub struct GetTypeNameLen<T>(T);
24
25 impl<T: 'static> GetTypeNameLen<T> {
26     pub const VALUE: usize = any::type_name::<T>().len();
27 }
28
29 const fn check_type_name_len<T: 'static>() -> bool {
30     matches!(GetTypeNameLen::<T>::VALUE, GetTypeNameLen::<usize>::VALUE)
31 }
32
33 fn main() {
34     assert!(check_type_id::<usize>());
35     assert!(check_type_name_len::<usize>());
36 }