ICE when taking function pointer to generic intrinsic

[durka]

ICE on stable, beta, and nightly.

Code:

fn main() {
    println!("{:?}", 
{let _ = std::ptr::copy::<u8>;}
    );
}

ICE:

   Compiling expr v0.1.0 (file:///Users/alex/.multirust/toolchains/nightly/cargo/.cargo/script-cache/expr-68b6f2d3c9cc0b56)
error: internal compiler error: can't monomorphize a NodeForeignItem(ForeignItem { name: copy(65), attrs: [Spanned { node: Attribute_ { id: AttrId(1448), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// Copies `count * size_of<T>` bytes from `src` to `dst`. The source", CookedStr), span: ../src/libcore/intrinsics.rs:242:38: 243:43 }), span: ../src/libcore/intrinsics.rs:357:5: 357:74 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:357:5: 357:74 }, Spanned { node: Attribute_ { id: AttrId(1449), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// and destination may overlap.", CookedStr), span: ../src/libcore/intrinsics.rs:243:48: 244:16 }), span: ../src/libcore/intrinsics.rs:358:5: 358:37 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:358:5: 358:37 }, Spanned { node: Attribute_ { id: AttrId(1450), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///", CookedStr), span: ../src/libcore/intrinsics.rs:244:21: 244:24 }), span: ../src/libcore/intrinsics.rs:359:5: 359:8 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:359:5: 359:8 }, Spanned { node: Attribute_ { id: AttrId(1451), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// `copy` is semantically equivalent to C\'s `memmove`.", CookedStr), span: ../src/libcore/intrinsics.rs:244:29: 245:13 }), span: ../src/libcore/intrinsics.rs:360:5: 360:60 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:360:5: 360:60 }, Spanned { node: Attribute_ { id: AttrId(1452), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///", CookedStr), span: ../src/libcore/intrinsics.rs:245:18: 245:21 }), span: ../src/libcore/intrinsics.rs:361:5: 361:8 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:361:5: 361:8 }, Spanned { node: Attribute_ { id: AttrId(1453), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// # Safety", CookedStr), span: ../src/libcore/intrinsics.rs:245:26: 245:38 }), span: ../src/libcore/intrinsics.rs:362:5: 362:17 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:362:5: 362:17 }, Spanned { node: Attribute_ { id: AttrId(1454), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///", CookedStr), span: ../src/libcore/intrinsics.rs:246:3: 246:6 }), span: ../src/libcore/intrinsics.rs:363:5: 363:8 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:363:5: 363:8 }, Spanned { node: Attribute_ { id: AttrId(1455), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// Care must be taken with the ownership of `src` and `dst`.", CookedStr), span: ../src/libcore/intrinsics.rs:246:11: 249:4 }), span: ../src/libcore/intrinsics.rs:364:5: 364:66 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:364:5: 364:66 }, Spanned { node: Attribute_ { id: AttrId(1456), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// This method semantically moves the values of `src` into `dst`.", CookedStr), span: ../src/libcore/intrinsics.rs:250:1: 250:67 }), span: ../src/libcore/intrinsics.rs:365:5: 365:71 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:365:5: 365:71 }, Spanned { node: Attribute_ { id: AttrId(1457), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// However it does not drop the contents of `dst`, or prevent the contents of `src`", CookedStr), span: ../src/libcore/intrinsics.rs:251:3: 252:19 }), span: ../src/libcore/intrinsics.rs:366:5: 366:89 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:366:5: 366:89 }, Spanned { node: Attribute_ { id: AttrId(1458), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// from being dropped or used.", CookedStr), span: ../src/libcore/intrinsics.rs:252:24: 252:55 }), span: ../src/libcore/intrinsics.rs:367:5: 367:36 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:367:5: 367:36 }, Spanned { node: Attribute_ { id: AttrId(1459), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///", CookedStr), span: ../src/libcore/intrinsics.rs:253:2: 253:5 }), span: ../src/libcore/intrinsics.rs:368:5: 368:8 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:368:5: 368:8 }, Spanned { node: Attribute_ { id: AttrId(1460), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// # Examples", CookedStr), span: ../src/libcore/intrinsics.rs:253:10: 253:24 }), span: ../src/libcore/intrinsics.rs:369:5: 369:19 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:369:5: 369:19 }, Spanned { node: Attribute_ { id: AttrId(1461), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///", CookedStr), span: ../src/libcore/intrinsics.rs:253:29: 253:32 }), span: ../src/libcore/intrinsics.rs:370:5: 370:8 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:370:5: 370:8 }, Spanned { node: Attribute_ { id: AttrId(1462), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// Efficiently create a Rust vector from an unsafe buffer:", CookedStr), span: ../src/libcore/intrinsics.rs:253:37: 254:28 }), span: ../src/libcore/intrinsics.rs:371:5: 371:64 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:371:5: 371:64 }, Spanned { node: Attribute_ { id: AttrId(1463), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///", CookedStr), span: ../src/libcore/intrinsics.rs:254:33: 254:36 }), span: ../src/libcore/intrinsics.rs:372:5: 372:8 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:372:5: 372:8 }, Spanned { node: Attribute_ { id: AttrId(1464), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// ```", CookedStr), span: ../src/libcore/intrinsics.rs:254:41: 254:48 }), span: ../src/libcore/intrinsics.rs:373:5: 373:12 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:373:5: 373:12 }, Spanned { node: Attribute_ { id: AttrId(1465), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// use std::ptr;", CookedStr), span: ../src/libcore/intrinsics.rs:254:53: 255:4 }), span: ../src/libcore/intrinsics.rs:374:5: 374:22 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:374:5: 374:22 }, Spanned { node: Attribute_ { id: AttrId(1466), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///", CookedStr), span: ../src/libcore/intrinsics.rs:255:9: 255:12 }), span: ../src/libcore/intrinsics.rs:375:5: 375:8 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:375:5: 375:8 }, Spanned { node: Attribute_ { id: AttrId(1467), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// # #[allow(dead_code)]", CookedStr), span: ../src/libcore/intrinsics.rs:255:17: 257:12 }), span: ../src/libcore/intrinsics.rs:376:5: 376:30 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:376:5: 376:30 }, Spanned { node: Attribute_ { id: AttrId(1468), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// unsafe fn from_buf_raw<T>(ptr: *const T, elts: usize) -> Vec<T> {", CookedStr), span: ../src/libcore/intrinsics.rs:257:17: 258:24 }), span: ../src/libcore/intrinsics.rs:377:5: 377:74 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:377:5: 377:74 }, Spanned { node: Attribute_ { id: AttrId(1469), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///     let mut dst = Vec::with_capacity(elts);", CookedStr), span: ../src/libcore/intrinsics.rs:258:29: 260:41 }), span: ../src/libcore/intrinsics.rs:378:5: 378:52 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:378:5: 378:52 }, Spanned { node: Attribute_ { id: AttrId(1470), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///     dst.set_len(elts);", CookedStr), span: ../src/libcore/intrinsics.rs:260:46: 260:72 }), span: ../src/libcore/intrinsics.rs:379:5: 379:31 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:379:5: 379:31 }, Spanned { node: Attribute_ { id: AttrId(1471), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///     ptr::copy(ptr, dst.as_mut_ptr(), elts);", CookedStr), span: ../src/libcore/intrinsics.rs:260:77: 262:38 }), span: ../src/libcore/intrinsics.rs:380:5: 380:52 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:380:5: 380:52 }, Spanned { node: Attribute_ { id: AttrId(1472), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///     dst", CookedStr), span: ../src/libcore/intrinsics.rs:262:43: 264:2 }), span: ../src/libcore/intrinsics.rs:381:5: 381:16 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:381:5: 381:16 }, Spanned { node: Attribute_ { id: AttrId(1473), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// }", CookedStr), span: ../src/libcore/intrinsics.rs:264:7: 264:12 }), span: ../src/libcore/intrinsics.rs:382:5: 382:10 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:382:5: 382:10 }, Spanned { node: Attribute_ { id: AttrId(1474), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("/// ```", CookedStr), span: ../src/libcore/intrinsics.rs:264:17: 265:5 }), span: ../src/libcore/intrinsics.rs:383:5: 383:12 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:383:5: 383:12 }, Spanned { node: Attribute_ { id: AttrId(1475), style: Outer, value: Spanned { node: MetaNameValue("doc", Spanned { node: LitStr("///", CookedStr), span: ../src/libcore/intrinsics.rs:266:2: 266:5 }), span: ../src/libcore/intrinsics.rs:384:5: 384:8 }, is_sugared_doc: true }, span: ../src/libcore/intrinsics.rs:384:5: 384:8 }, Spanned { node: Attribute_ { id: AttrId(1476), style: Outer, value: Spanned { node: MetaList("stable", [Spanned { node: MetaNameValue("feature", Spanned { node: LitStr("rust1", CookedStr), span: ../src/libcore/intrinsics.rs:267:17: 268:2 }), span: ../src/libcore/intrinsics.rs:385:14: 385:32 }, Spanned { node: MetaNameValue("since", Spanned { node: LitStr("1.0.0", CookedStr), span: ../src/libcore/intrinsics.rs:269:4: 269:11 }), span: ../src/libcore/intrinsics.rs:385:33: 385:49 }]), span: ../src/libcore/intrinsics.rs:385:7: 385:50 }, is_sugared_doc: false }, span: ../src/libcore/intrinsics.rs:385:5: 385:50 }], node: ForeignItemFn(FnDecl { inputs: [Arg { ty: type(*const T), pat: pat(72: src), id: 71 }, Arg { ty: type(*mut T), pat: pat(76: dst), id: 75 }, Arg { ty: type(usize), pat: pat(80: count), id: 79 }], output: DefaultReturn(../src/libcore/intrinsics.rs:270:12: 270:12), variadic: false }, Generics { lifetimes: [], ty_params: [TyParam { name: T(1580), id: 82, bounds: [], default: None, span: ../src/libcore/intrinsics.rs:269:30: 269:31 }], where_clause: WhereClause { id: 83, predicates: [] } }), id: 70, span: ../src/libcore/intrinsics.rs:386:5: 386:62, vis: Public })
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
thread 'rustc' panicked at 'Box<Any>', ../src/libsyntax/errors/mod.rs:469
stack backtrace:
   1:        0x10e1489b8 - sys::backtrace::tracing::imp::write::h205a11cf52158765f0t
   2:        0x10e14ed6f - panicking::default_handler::_<closure>::closure.42055
   3:        0x10e14e7b2 - panicking::default_handler::hc5f9b2cc38e6415fZYx
   4:        0x10e116614 - sys_common::unwind::begin_unwind_inner::hd4bbb2308abfe323h3s
   5:        0x10d84c1da - sys_common::unwind::begin_unwind::h12496273753689425178
   6:        0x10d84c641 - errors::Handler::bug::hdef34fc4eaae66ce9ed
   7:        0x10ad87d4f - session::Session::bug::h388e66a8222d872c8Qt
   8:        0x10a6f17f4 - trans::monomorphize::monomorphic_fn::h096821ead46d9aaaeyP
   9:        0x10a6e11bf - trans::callee::trans_fn_ref_with_substs::h05a8e0f864bd6f19qtp
  10:        0x10a6dff2f - trans::callee::trans_fn_ref::h1144e47ea9da6bf0Eip
  11:        0x10a71db84 - trans::expr::trans_def_fn_unadjusted::h5dfbe914c47b97a4bSD
  12:        0x10a718c5b - trans::consts::const_expr_unadjusted::hadb254ab8566d69fKyu
  13:        0x10a714687 - trans::consts::const_expr::h911e74302508d9e4Ogu
  14:        0x10a7156e7 - trans::consts::get_const_expr_as_global::hd5ae4fa5ac33c9cbLau
  15:        0x10a67ac56 - trans::expr::trans::h131c0f930fdc6284rxC
  16:        0x10a7322a3 - trans::expr::trans_to_lvalue::h6635c0f082e0b6a0l1C
  17:        0x10a69ca9e - trans::base::init_local::hbe583f5fb6292b86hIi
  18:        0x10a6b55a1 - trans::controlflow::trans_block::he23a1b48be99e429zcx
  19:        0x10a755f51 - trans::expr::trans_rvalue_dps_unadjusted::hee0517592b0b4bd1KzD
  20:        0x10a754885 - trans::expr::trans_unadjusted::h2c3cdc2e741fe618c2C
  21:        0x10a67b549 - trans::expr::trans::h131c0f930fdc6284rxC
  22:        0x10a7322a3 - trans::expr::trans_to_lvalue::h6635c0f082e0b6a0l1C
  23:        0x10a75f4af - trans::expr::trans_addr_of::h4910fcfa3b614ff5okE
  24:        0x10a754cad - trans::expr::trans_unadjusted::h2c3cdc2e741fe618c2C
  25:        0x10a6b9350 - trans::expr::trans_into::ha182c3679c0f7c083qC
  26:        0x10a6b7cd8 - trans::expr::trans_adt::hba95cfeb79fd913ci2D
  27:        0x10a758398 - trans::expr::trans_rvalue_dps_unadjusted::hee0517592b0b4bd1KzD
  28:        0x10a7545fa - trans::expr::trans_unadjusted::h2c3cdc2e741fe618c2C
  29:        0x10a67b549 - trans::expr::trans::h131c0f930fdc6284rxC
  30:        0x10a7322a3 - trans::expr::trans_to_lvalue::h6635c0f082e0b6a0l1C
  31:        0x10a793a5b - trans::_match::trans_match_inner::hc54ca21fc98f7ea9r3L
  32:        0x10a755ed6 - trans::expr::trans_rvalue_dps_unadjusted::hee0517592b0b4bd1KzD
  33:        0x10a7545fa - trans::expr::trans_unadjusted::h2c3cdc2e741fe618c2C
  34:        0x10a67b549 - trans::expr::trans::h131c0f930fdc6284rxC
  35:        0x10a7322a3 - trans::expr::trans_to_lvalue::h6635c0f082e0b6a0l1C
  36:        0x10a75f4af - trans::expr::trans_addr_of::h4910fcfa3b614ff5okE
  37:        0x10a754cad - trans::expr::trans_unadjusted::h2c3cdc2e741fe618c2C
  38:        0x10a67b549 - trans::expr::trans::h131c0f930fdc6284rxC
  39:        0x10a6ee3b5 - trans::callee::trans_args::he2ea0a418a6f5bf2I4p
  40:        0x10a6f3e77 - trans::callee::trans_call_inner::h1022655365734521182
  41:        0x10a756c21 - trans::expr::trans_rvalue_dps_unadjusted::hee0517592b0b4bd1KzD
  42:        0x10a7545fa - trans::expr::trans_unadjusted::h2c3cdc2e741fe618c2C
  43:        0x10a67b549 - trans::expr::trans::h131c0f930fdc6284rxC
  44:        0x10a6ee3b5 - trans::callee::trans_args::he2ea0a418a6f5bf2I4p
  45:        0x10a6f3e77 - trans::callee::trans_call_inner::h1022655365734521182
  46:        0x10a756c21 - trans::expr::trans_rvalue_dps_unadjusted::hee0517592b0b4bd1KzD
  47:        0x10a6b9330 - trans::expr::trans_into::ha182c3679c0f7c083qC
  48:        0x10a732235 - trans::controlflow::trans_stmt_semi::hd7994b082826448eDbx
  49:        0x10a6b557d - trans::controlflow::trans_block::he23a1b48be99e429zcx
  50:        0x10a6b0459 - trans::base::trans_closure::h93f148365767cb227vj
  51:        0x10a6b5f05 - trans::base::trans_fn::hdadb98ea2f3363a8TFj
  52:        0x10a6ba6b1 - trans::base::trans_item::h6d527a74db9fcd19X3j
  53:        0x10a6d50fb - trans::base::TransItemsWithinModVisitor<'a, 'tcx>.Visitor<'v>::visit_item::h760a7a92bcad9971d4k
  54:        0x10a6c6c55 - trans::base::trans_crate::h8a61c24454d2cf9dINk
  55:        0x109f5c54d - driver::phase_4_translate_to_llvm::h6a6d28e27ce2fe48PTa
  56:        0x109f52739 - driver::phase_3_run_analysis_passes::_<closure>::closure.26438
  57:        0x109f34fa4 - middle::ty::context::ctxt<'tcx>::create_and_enter::h370372343873663919
  58:        0x109f30c5d - driver::phase_3_run_analysis_passes::h16107789473110901907
  59:        0x109f026aa - driver::compile_input::hbc12c04dfe7ee2c0kca
  60:        0x109ef443f - run_compiler::h6bc2c57b5033a6e4Rwc
  61:        0x109ef113c - sys_common::unwind::try::try_fn::h10843292888798321982
  62:        0x10e146668 - __rust_try
  63:        0x10e13e42e - sys_common::unwind::try::inner_try::h060cb066aa382f27PZs
  64:        0x109ef1511 - boxed::F.FnBox<A>::call_box::h15928378584472144199
  65:        0x10e14db0d - sys::thread::Thread::new::thread_start::h3906ff09ada8499amex
  66:     0x7fff8a49f898 - _pthread_body
  67:     0x7fff8a49f729 - _pthread_start

Could not compile `expr`.

To learn more, run the command again with --verbose.
internal error: cargo failed with status 101
An unknown error occurred

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

[huonw]

Dupe of #15694 (and #20318). Thanks for filing!