ICE: "expected to convert valtree to raw bytes for type u8" compiler/rustc_middle/src/ty/print/pretty.rs with issue-70408.rs and -Zunpretty=mir

`./src/test/ui/const-generics/issue-70408.rs`
### Code

```Rust
// build-pass

#![feature(adt_const_params)]
#![allow(incomplete_features)]

pub fn function_with_bytes<const BYTES: &'static [u8; 4]>() -> &'static [u8] {
    BYTES
}

pub fn main() {
    assert_eq!(function_with_bytes::<b"AAAA">(), &[0x41, 0x41, 0x41, 0x41]);
    assert_eq!(function_with_bytes::<{ &[0x41, 0x41, 0x41, 0x41] }>(), b"AAAA");
}
```


### Meta


`rustc --version --verbose`:
```
rustc 1.64.0-nightly (87588a2af 2022-07-13)
binary: rustc
commit-hash: 87588a2afd9ca903366f0deaf84d805f34469384
commit-date: 2022-07-13
host: x86_64-unknown-linux-gnu
release: 1.64.0-nightly
LLVM version: 14.0.6
```

### Error output
`rustc ./src/test/ui/const-generics/issue-70408.rs  -Zunpretty=mir`
```
```


<details><summary><strong>Backtrace</strong></summary>
<p>

```
error: internal compiler error: compiler/rustc_middle/src/ty/print/pretty.rs:1454:21: expected to convert valtree to raw bytes for type u8

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/87588a2afd9ca903366f0deaf84d805f34469384/compiler/rustc_errors/src/lib.rs:1391:9
stack backtrace:
   0:     0x7f6f968a2850 - std::backtrace_rs::backtrace::libunwind::trace::h546e34b136647819
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   1:     0x7f6f968a2850 - std::backtrace_rs::backtrace::trace_unsynchronized::h76e576fe0a1ec65e
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f6f968a2850 - std::sys_common::backtrace::_print_fmt::h3489fbb9d5d01094
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f6f968a2850 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h401cfc97a3c2f247
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f6f968fbe2c - core::fmt::write::h327c921ac5532dc9
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:1198:17
   5:     0x7f6f96893e15 - std::io::Write::write_fmt::h334c1fe5d85b41a9
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/io/mod.rs:1672:15
   6:     0x7f6f968a54e1 - std::sys_common::backtrace::_print::hddc5656bc817cc55
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f6f968a54e1 - std::sys_common::backtrace::print::h46adcb0dcb6fbe81
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f6f968a54e1 - std::panicking::default_hook::{{closure}}::h7e55301ce91fa17d
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/panicking.rs:295:22
   9:     0x7f6f968a51b3 - std::panicking::default_hook::he24b412fa8dea167
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/panicking.rs:314:9
  10:     0x7f6f97147e04 - rustc_driver[24990f24c5f9557a]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f6f968a5cb6 - std::panicking::rust_panic_with_hook::hd6be56b55800f278
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/panicking.rs:702:17
  12:     0x7f6f98138d41 - std[66dc708de7974585]::panicking::begin_panic::<rustc_errors[7a9b9cc96f052d83]::ExplicitBug>::{closure#0}
  13:     0x7f6f98135fb6 - std[66dc708de7974585]::sys_common::backtrace::__rust_end_short_backtrace::<std[66dc708de7974585]::panicking::begin_panic<rustc_errors[7a9b9cc96f052d83]::ExplicitBug>::{closure#0}, !>
  14:     0x7f6f98183436 - std[66dc708de7974585]::panicking::begin_panic::<rustc_errors[7a9b9cc96f052d83]::ExplicitBug>
  15:     0x7f6f98133fc6 - std[66dc708de7974585]::panic::panic_any::<rustc_errors[7a9b9cc96f052d83]::ExplicitBug>
  16:     0x7f6f98132d85 - <rustc_errors[7a9b9cc96f052d83]::HandlerInner>::bug::<&alloc[66d1c5d1fabcc843]::string::String>
  17:     0x7f6f98132ae0 - <rustc_errors[7a9b9cc96f052d83]::Handler>::bug::<&alloc[66d1c5d1fabcc843]::string::String>
  18:     0x7f6f981c9fbd - rustc_middle[911aaa7bc28cd14c]::ty::context::tls::with_context_opt::<rustc_middle[911aaa7bc28cd14c]::ty::context::tls::with_opt<rustc_middle[911aaa7bc28cd14c]::util::bug::opt_span_bug_fmt<rustc_span[b8cb56592c4d9b67]::span_encoding::Span>::{closure#0}, ()>::{closure#0}, ()>
  19:     0x7f6f981cbb36 - rustc_middle[911aaa7bc28cd14c]::util::bug::opt_span_bug_fmt::<rustc_span[b8cb56592c4d9b67]::span_encoding::Span>
  20:     0x7f6f981cbab3 - rustc_middle[911aaa7bc28cd14c]::util::bug::bug_fmt
  21:     0x7f6f98177c81 - <rustc_middle[911aaa7bc28cd14c]::ty::print::pretty::FmtPrinter as rustc_middle[911aaa7bc28cd14c]::ty::print::pretty::PrettyPrinter>::pretty_print_const_valtree
  22:     0x7f6f981779e9 - <rustc_middle[911aaa7bc28cd14c]::ty::print::pretty::FmtPrinter as rustc_middle[911aaa7bc28cd14c]::ty::print::pretty::PrettyPrinter>::pretty_print_const_valtree
  23:     0x7f6f98175588 - <rustc_middle[911aaa7bc28cd14c]::ty::print::pretty::FmtPrinter as rustc_middle[911aaa7bc28cd14c]::ty::print::pretty::PrettyPrinter>::pretty_print_const
  24:     0x7f6f99b45772 - <rustc_middle[911aaa7bc28cd14c]::ty::print::pretty::FmtPrinter as rustc_middle[911aaa7bc28cd14c]::ty::print::Printer>::print_def_path
  25:     0x7f6f98179424 - <rustc_middle[911aaa7bc28cd14c]::ty::print::pretty::FmtPrinter as rustc_middle[911aaa7bc28cd14c]::ty::print::pretty::PrettyPrinter>::print_value_path
  26:     0x7f6f981de7f7 - rustc_middle[911aaa7bc28cd14c]::ty::context::tls::with_context::<rustc_middle[911aaa7bc28cd14c]::ty::context::tls::with<rustc_middle[911aaa7bc28cd14c]::mir::pretty_print_const_value::{closure#0}, core[734affb1a3eaf053]::result::Result<(), core[734affb1a3eaf053]::fmt::Error>>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), core[734affb1a3eaf053]::fmt::Error>>::{closure#0}
  27:     0x7f6f981da399 - <rustc_middle[911aaa7bc28cd14c]::mir::ConstantKind as core[734affb1a3eaf053]::fmt::Display>::fmt
  28:     0x7f6f968fbe2c - core::fmt::write::h327c921ac5532dc9
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:1198:17
  29:     0x7f6f968fcd34 - core::fmt::Formatter::write_fmt::hf38f1b393ccdcc09
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:1652:9
  30:     0x7f6f981da261 - <rustc_middle[911aaa7bc28cd14c]::mir::Constant as core[734affb1a3eaf053]::fmt::Debug>::fmt
  31:     0x7f6f968fbe2c - core::fmt::write::h327c921ac5532dc9
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:1198:17
  32:     0x7f6f968fcd34 - core::fmt::Formatter::write_fmt::hf38f1b393ccdcc09
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:1652:9
  33:     0x7f6f981c670b - <rustc_middle[911aaa7bc28cd14c]::mir::syntax::Operand as core[734affb1a3eaf053]::fmt::Debug>::fmt
  34:     0x7f6f968fbe2c - core::fmt::write::h327c921ac5532dc9
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:1198:17
  35:     0x7f6f968fcd34 - core::fmt::Formatter::write_fmt::hf38f1b393ccdcc09
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:1652:9
  36:     0x7f6f981c4333 - <rustc_middle[911aaa7bc28cd14c]::mir::syntax::TerminatorKind as core[734affb1a3eaf053]::fmt::Debug>::fmt
  37:     0x7f6f968fbdab - core::fmt::run::he8439e514cab33ef
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:1246:5
  38:     0x7f6f968fbdab - core::fmt::write::h327c921ac5532dc9
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:1214:26
  39:     0x7f6f968ee7f5 - core::fmt::Write::write_fmt::h76e3ebb460982542
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:188:9
  40:     0x7f6f968ee7f5 - alloc::fmt::format::format_inner::h74f55ded98ffe87b
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/alloc/src/fmt.rs:612:9
  41:     0x7f6f98226a07 - rustc_middle[911aaa7bc28cd14c]::mir::pretty::write_mir_pretty::{closure#0}
  42:     0x7f6f982252b1 - rustc_middle[911aaa7bc28cd14c]::mir::pretty::write_mir_pretty
  43:     0x7f6f97138c57 - rustc_driver[24990f24c5f9557a]::pretty::print_after_hir_lowering
  44:     0x7f6f971223ba - <rustc_interface[d9e16a24b5464548]::passes::QueryContext>::enter::<rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}::{closure#2}::{closure#1}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>
  45:     0x7f6f992ea90f - <rustc_interface[d9e16a24b5464548]::interface::Compiler>::enter::<rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}::{closure#2}, core[734affb1a3eaf053]::result::Result<core[734affb1a3eaf053]::option::Option<rustc_interface[d9e16a24b5464548]::queries::Linker>, rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>
  46:     0x7f6f992e676f - rustc_span[b8cb56592c4d9b67]::with_source_map::<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_interface[d9e16a24b5464548]::interface::create_compiler_and_run<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}>::{closure#1}>
  47:     0x7f6f99302880 - rustc_interface[d9e16a24b5464548]::interface::create_compiler_and_run::<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}>
  48:     0x7f6f99316a02 - <scoped_tls[93927b52d599628f]::ScopedKey<rustc_span[b8cb56592c4d9b67]::SessionGlobals>>::set::<rustc_interface[d9e16a24b5464548]::interface::run_compiler<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>
  49:     0x7f6f992e8cff - std[66dc708de7974585]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[d9e16a24b5464548]::util::run_in_thread_pool_with_globals<rustc_interface[d9e16a24b5464548]::interface::run_compiler<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>
  50:     0x7f6f99302cd9 - <<std[66dc708de7974585]::thread::Builder>::spawn_unchecked_<rustc_interface[d9e16a24b5464548]::util::run_in_thread_pool_with_globals<rustc_interface[d9e16a24b5464548]::interface::run_compiler<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>::{closure#1} as core[734affb1a3eaf053]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  51:     0x7f6f968af703 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h332a3f23c5b3d8bc
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/alloc/src/boxed.rs:1934:9
  52:     0x7f6f968af703 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h33b3da7f4496df00
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/alloc/src/boxed.rs:1934:9
  53:     0x7f6f968af703 - std::sys::unix::thread::Thread::new::thread_start::hf48274d01b2ded65
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/sys/unix/thread.rs:108:17
  54:     0x7f6f9668054d - <unknown>
  55:     0x7f6f96705874 - clone
  56:                0x0 - <unknown>

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.64.0-nightly (87588a2af 2022-07-13) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z unpretty=mir

query stack during panic:
end of query stack
error: aborting due to previous error
```

</p>
</details>

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ICE: "expected to convert valtree to raw bytes for type u8" compiler/rustc_middle/src/ty/print/pretty.rs with issue-70408.rs and -Zunpretty=mir #99325

matthiaskrgr
openedon Jul 16, 2022

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