mirror of https://github.com/rust-lang/rust
39 lines
1.1 KiB
Rust
39 lines
1.1 KiB
Rust
// This test is from #73976. We previously did not check if a type is monomorphized
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// before calculating its type id, which leads to the bizarre behaviour below that
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// TypeId of a generic type does not match itself.
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//
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// This test case should either run-pass or be rejected at compile time.
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// Currently we just disallow this usage and require pattern is monomorphic.
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#![feature(const_type_id)]
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#![feature(const_type_name)]
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use std::any::{self, TypeId};
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pub struct GetTypeId<T>(T);
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impl<T: 'static> GetTypeId<T> {
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pub const VALUE: TypeId = TypeId::of::<T>();
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}
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const fn check_type_id<T: 'static>() -> bool {
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matches!(GetTypeId::<T>::VALUE, GetTypeId::<T>::VALUE)
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//~^ ERROR constant pattern depends on a generic parameter
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}
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pub struct GetTypeNameLen<T>(T);
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impl<T: 'static> GetTypeNameLen<T> {
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pub const VALUE: usize = any::type_name::<T>().len();
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}
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const fn check_type_name_len<T: 'static>() -> bool {
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matches!(GetTypeNameLen::<T>::VALUE, GetTypeNameLen::<T>::VALUE)
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//~^ ERROR constant pattern depends on a generic parameter
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}
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fn main() {
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assert!(check_type_id::<usize>());
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assert!(check_type_name_len::<usize>());
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}
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