[const_generics] Passing a safe function outside `impl` crashes

[TheAifam5]

Code

https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=773be47feb4d2457cae6b70f69b3501e

#![feature(const_generics)]
#![feature(const_compare_raw_pointers)]

struct Test();

fn pass() {
    println!("Hello, world!");
}

impl Test {
    
    pub fn call_me(&self) {
        self.test::<pass>();
    }
    
    fn test<const FN: fn()>(&self) {
        FN();
    }
}

fn main() {
    let x = Test();
    x.call_me()
}

Meta

rustc --version --verbose:

1.44.0-nightly 2020-04-20 20fc02f836f3035b86b5

Error output

error: internal compiler error: src/librustc_codegen_llvm/context.rs:849: failed to get layout for `[type error]`: the type `[type error]` has an unknown layout

Backtrace

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:904:9
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:78
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:59
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1069
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1504
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:62
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:198
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:218
  10: rustc_driver::report_ice
  11: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:515
  12: std::panicking::begin_panic
  13: rustc_errors::HandlerInner::bug
  14: rustc_errors::Handler::bug
  15: rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}
  16: rustc_middle::ty::context::tls::with_opt::{{closure}}
  17: rustc_middle::ty::context::tls::with_opt
  18: rustc_middle::util::bug::opt_span_bug_fmt
  19: rustc_middle::util::bug::bug_fmt
  20: <rustc_codegen_llvm::context::CodegenCx as rustc_target::abi::LayoutOf>::spanned_layout_of::{{closure}}
  21: <rustc_codegen_llvm::context::CodegenCx as rustc_target::abi::LayoutOf>::spanned_layout_of
  22: rustc_codegen_ssa::mir::analyze::non_ssa_locals
  23: rustc_codegen_ssa::mir::codegen_mir
  24: <rustc_middle::mir::mono::MonoItem as rustc_codegen_ssa::mono_item::MonoItemExt>::define
  25: rustc_codegen_llvm::base::compile_codegen_unit::module_codegen
  26: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
  27: rustc_codegen_llvm::base::compile_codegen_unit
  28: rustc_codegen_ssa::base::codegen_crate
  29: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  30: rustc_session::utils::<impl rustc_session::session::Session>::time
  31: rustc_interface::passes::start_codegen
  32: rustc_middle::ty::context::tls::enter_global
  33: rustc_interface::queries::Queries::ongoing_codegen
  34: rustc_interface::interface::run_compiler_in_existing_thread_pool
  35: scoped_tls::ScopedKey<T>::set
  36: rustc_ast::attr::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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 1.44.0-nightly (20fc02f83 2020-04-20) 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

query stack during panic:
end of query stack
error: aborting due to previous error; 1 warning emitted

error: could not compile `playground`.

Possible related issue

#71381

[varkor]

Probably related to #71154.

[JohnTitor]

Triage: the const_compare_raw_pointers feature was removed by #73398 and the ICE no longer occurs with the latest nightly.