| //! Ensure that we do not dead-code-eliminate `size_of` calls. That might hide "type too big" |
| //! errors! |
| //@ build-fail (test needs codegen) |
| //@ compile-flags: -O |
| //@ normalize-stderr: "\d{5}\d*" -> "NUMBER" |
| |
| //~? ERROR too big for the target |
| |
| #![crate_type = "lib"] |
| |
| const PTR_BITS_MINUS_1: usize = std::mem::size_of::<*const ()>() * 8 - 1; |
| |
| #[unsafe(no_mangle)] // ensure this gets monomorphized |
| pub fn f() { |
| assert_valid_type::<[u32; 1 << PTR_BITS_MINUS_1]>(); |
| } |
| |
| pub fn assert_valid_type<T>() { |
| std::mem::size_of::<T>(); |
| } |
