| // run-pass |
| // Test that type IDs correctly account for higher-rank lifetimes |
| // Also acts as a regression test for an ICE (issue #19791) |
| |
| use std::any::{Any, TypeId}; |
| |
| struct Struct<'a>(&'a ()); |
| trait Trait<'a> {} |
| |
| fn main() { |
| // Bare fns |
| { |
| let a = TypeId::of::<fn(&'static isize, &'static isize)>(); |
| let b = TypeId::of::<for<'a> fn(&'static isize, &'a isize)>(); |
| let c = TypeId::of::<for<'a, 'b> fn(&'a isize, &'b isize)>(); |
| let d = TypeId::of::<for<'a, 'b> fn(&'b isize, &'a isize)>(); |
| assert!(a != b); |
| assert!(a != c); |
| assert!(a != d); |
| assert!(b != c); |
| assert!(b != d); |
| assert_eq!(c, d); |
| |
| // Make sure De Bruijn indices are handled correctly |
| let e = TypeId::of::<for<'a> fn(fn(&'a isize) -> &'a isize)>(); |
| let f = TypeId::of::<fn(for<'a> fn(&'a isize) -> &'a isize)>(); |
| assert!(e != f); |
| |
| // Make sure lifetime parameters of items are not ignored. |
| let g = TypeId::of::<for<'a> fn(&'a dyn Trait<'a>) -> Struct<'a>>(); |
| let h = TypeId::of::<for<'a> fn(&'a dyn Trait<'a>) -> Struct<'static>>(); |
| let i = TypeId::of::<for<'a, 'b> fn(&'a dyn Trait<'b>) -> Struct<'b>>(); |
| assert!(g != h); |
| assert!(g != i); |
| assert!(h != i); |
| |
| // Make sure lifetime anonymization handles nesting correctly |
| let j = TypeId::of::<fn(for<'a> fn(&'a isize) -> &'a usize)>(); |
| let k = TypeId::of::<fn(for<'b> fn(&'b isize) -> &'b usize)>(); |
| assert_eq!(j, k); |
| } |
| // Boxed unboxed closures |
| { |
| let a = TypeId::of::<Box<dyn Fn(&'static isize, &'static isize)>>(); |
| let b = TypeId::of::<Box<dyn for<'a> Fn(&'static isize, &'a isize)>>(); |
| let c = TypeId::of::<Box<dyn for<'a, 'b> Fn(&'a isize, &'b isize)>>(); |
| let d = TypeId::of::<Box<dyn for<'a, 'b> Fn(&'b isize, &'a isize)>>(); |
| assert!(a != b); |
| assert!(a != c); |
| assert!(a != d); |
| assert!(b != c); |
| assert!(b != d); |
| assert_eq!(c, d); |
| |
| // Make sure De Bruijn indices are handled correctly |
| let e = TypeId::of::<Box<dyn for<'a> Fn(Box<dyn Fn(&'a isize) -> &'a isize>)>>(); |
| let f = TypeId::of::<Box<dyn Fn(Box<dyn for<'a> Fn(&'a isize) -> &'a isize>)>>(); |
| assert!(e != f); |
| } |
| // Raw unboxed closures |
| // Note that every unboxed closure has its own anonymous type, |
| // so no two IDs should equal each other, even when compatible |
| { |
| let a = id(|_: &isize, _: &isize| {}); |
| let b = id(|_: &isize, _: &isize| {}); |
| assert!(a != b); |
| } |
| |
| fn id<T:Any>(_: T) -> TypeId { |
| TypeId::of::<T>() |
| } |
| } |