Compiling playground v0.0.1 (/playground)
warning: the feature `const_generics` is incomplete and may cause the compiler to crash
 --> src/lib.rs:1:12
  |
1 | #![feature(const_generics)]
  |            ^^^^^^^^^^^^^^

error: internal compiler error: broken MIR in DefId(0:14 ~ playground[d52b]::use_it[0]) (CanonicalUserTypeAnnotation { user_ty: Canonical { max_universe: U0, variables: [], value: TypeOf(DefId(0:12 ~ playground[d52b]::function_with_str[0]), UserSubsts { substs: [Const { ty: &'static str, val: Unevaluated(DefId(0:15 ~ playground[d52b]::use_it[0]::{{constant}}[0]), []) }], user_self_ty: None }) }, span: src/lib.rs:7:5: 7:41, inferred_ty: fn() {function_with_str::<Const { ty: &str, val: Slice(Ptr(Pointer { alloc_id: AllocId(0), offset: Size { raw: 0 }, tag: () }), 13) }>} }): bad user type AscribeUserType(fn() {function_with_str::<Const { ty: &str, val: Slice(Ptr(Pointer { alloc_id: AllocId(0), offset: Size { raw: 0 }, tag: () }), 13) }>}, DefId(0:12 ~ playground[d52b]::function_with_str[0]) UserSubsts { substs: [Const { ty: &'static str, val: Unevaluated(DefId(0:15 ~ playground[d52b]::use_it[0]::{{constant}}[0]), []) }], user_self_ty: None }): NoSolution

error: internal compiler error: broken MIR in DefId(0:14 ~ playground[d52b]::use_it[0]) (const function_with_str): constant const function_with_str should have type fn() {function_with_str::<Const { ty: &str, val: Slice(Ptr(Pointer { alloc_id: AllocId(0), offset: Size { raw: 0 }, tag: () }), 13) }>} but has fn() {function_with_str::<Const { ty: &str, val: Slice(Ptr(Pointer { alloc_id: AllocId(0), offset: Size { raw: 0 }, tag: () }), 13) }>} (NoSolution)
 --> src/lib.rs:7:5
  |
7 |     function_with_str::<"Hello, world!">()
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: internal compiler error: broken MIR in DefId(0:14 ~ playground[d52b]::use_it[0]) (const function_with_str): bad constant user type CanonicalUserTypeAnnotation { user_ty: Canonical { max_universe: U0, variables: [], value: TypeOf(DefId(0:12 ~ playground[d52b]::function_with_str[0]), UserSubsts { substs: [Const { ty: &'static str, val: Unevaluated(DefId(0:15 ~ playground[d52b]::use_it[0]::{{constant}}[0]), []) }], user_self_ty: None }) }, span: src/lib.rs:7:5: 7:41, inferred_ty: fn() {function_with_str::<Const { ty: &str, val: Slice(Ptr(Pointer { alloc_id: AllocId(0), offset: Size { raw: 0 }, tag: () }), 13) }>} } vs fn() {function_with_str::<Const { ty: &str, val: Slice(Ptr(Pointer { alloc_id: AllocId(0), offset: Size { raw: 0 }, tag: () }), 13) }>}: NoSolution
 --> src/lib.rs:7:5
  |
7 |     function_with_str::<"Hello, world!">()
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', src/librustc_errors/lib.rs:356:17
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39
   1: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:71
   2: std::panicking::default_hook::{{closure}}
             at src/libstd/sys_common/backtrace.rs:59
             at src/libstd/panicking.rs:197
   3: std::panicking::default_hook
             at src/libstd/panicking.rs:211
   4: rustc::util::common::panic_hook
   5: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:478
   6: std::panicking::begin_panic
   7: <rustc_errors::Handler as core::ops::drop::Drop>::drop
   8: core::ptr::real_drop_in_place
   9: core::ptr::real_drop_in_place
  10: <alloc::rc::Rc<T> as core::ops::drop::Drop>::drop
  11: core::ptr::real_drop_in_place
  12: rustc_interface::interface::run_compiler_in_existing_thread_pool
  13: std::thread::local::LocalKey<T>::with
  14: scoped_tls::ScopedKey<T>::set
  15: syntax::with_globals
query stack during panic:
end of query stack

error: internal compiler error: unexpected panic

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 1.36.0-nightly (a9ec99f42 2019-05-13) running on x86_64-unknown-linux-gnu

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

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.