ICE when reifying intrinsic

[bjorn3]

It would be nice to just give a regular error.

#![feature(intrinsics)]

use std::intrinsics::copy;

fn main() {
    unsafe {
        let copy2: unsafe extern "rust-intrinsic" fn(*const u8, *mut u8, usize) = copy::<u8>;
        copy2(0 as *const u8, 0 as *mut u8, 0);
    }
}

(Playground)

Errors:

   Compiling playground v0.0.1 (file:///playground)
error: internal compiler error: librustc_mir/monomorphize/collector.rs:705: intrinsic DefId(2/1:301 ~ core[7fff]::intrinsics[0]::[1]::copy[0]) being reified

thread 'main' panicked at 'Box<Any>', librustc_errors/lib.rs:557:9
note: Run with `RUST_BACKTRACE=1` for a backtrace.
error: aborting due to previous error


note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.29.0-nightly (12ed235ad 2018-07-18) running on x86_64-unknown-linux-gnu

note: compiler flags: -C codegen-units=1 -C debuginfo=2 --crate-type bin

note: some of the compiler flags provided by cargo are hidden

error: Could not compile `playground`.

To learn more, run the command again with --verbose.

[wesleywiser]

I think this is a dup of #34123

[bjorn3]

Yes