$ RUST_BACKTRACE=full rustc ./huge.rs
thread 'rustc' panicked at 'begin <= end (22 <= 21) when slicing `const HELLO: &str = r"
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
hello!!
h`[...]', src/libcore/str/mod.rs:2021:5
stack backtrace:
   0:     0x7fc8de00011b - backtrace::backtrace::libunwind::trace::h912e0d04a7708cf2
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
   1:     0x7fc8de00011b - backtrace::backtrace::trace_unsynchronized::hfb708595cf87b63f
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
   2:     0x7fc8de00011b - std::sys_common::backtrace::_print::ha79f66d09fb9689e
                               at src/libstd/sys_common/backtrace.rs:47
   3:     0x7fc8de00011b - std::sys_common::backtrace::print::hbbf6608241e58d95
                               at src/libstd/sys_common/backtrace.rs:36
   4:     0x7fc8de00011b - std::panicking::default_hook::{{closure}}::h5463a2f4723f6cb3
                               at src/libstd/panicking.rs:198
   5:     0x7fc8ddfffe1e - std::panicking::default_hook::h79a408572fcba4ed
                               at src/libstd/panicking.rs:212
   6:     0x7fc8dbd92351 - rustc::util::common::panic_hook::h318156cfb41f5413
   7:     0x7fc8de000979 - std::panicking::rust_panic_with_hook::hb67cd2b0c77d9895
                               at src/libstd/panicking.rs:479
   8:     0x7fc8de000412 - std::panicking::continue_panic_fmt::he44145e3b8e029cd
                               at src/libstd/panicking.rs:382
   9:     0x7fc8de0002f6 - rust_begin_unwind
                               at src/libstd/panicking.rs:309
  10:     0x7fc8de02e11d - core::panicking::panic_fmt::h7327567cfbeab565
                               at src/libcore/panicking.rs:85
  11:     0x7fc8de030740 - core::str::slice_error_fail::hba2c24f2962448b8
                               at src/libcore/str/mod.rs:0
  12:     0x7fc8db0dd012 - core::str::traits::<impl core::slice::SliceIndex<str> for core::ops::range::Range<usize>>::index::{{closure}}::he3b193b38a91659a
  13:     0x7fc8db0ebf50 - syntax::parse::lexer::StringReader::with_str_from_to::h0d0fa368b8b05ffc
  14:     0x7fc8db0e9916 - syntax::parse::lexer::StringReader::advance_token::hc406a5a0c98fe430
  15:     0x7fc8db0e766d - syntax::parse::lexer::StringReader::try_next_token::habfb2fe795d28efa
  16:     0x7fc8db0e7a9f - syntax::parse::lexer::StringReader::real_token::hfbd846ba27af2f28
  17:     0x7fc8db115ef1 - syntax::parse::lexer::tokentrees::TokenTreesReader::parse_token_tree::h8061afbb3e86c76b
  18:     0x7fc8db1155ce - syntax::parse::lexer::tokentrees::TokenTreesReader::parse_all_token_trees::h8018bcf24cc2951d
  19:     0x7fc8db0e72f5 - syntax::parse::lexer::tokentrees::<impl syntax::parse::lexer::StringReader>::into_token_trees::h35e2e07fb40a0abc
  20:     0x7fc8db0035af - syntax::parse::maybe_file_to_stream::h77846087608aa34a
  21:     0x7fc8db002840 - syntax::parse::maybe_source_file_to_parser::h109680085ff17678
  22:     0x7fc8db0022b4 - syntax::parse::source_file_to_parser::h7859d86f2a1b8e8a
  23:     0x7fc8db00164a - syntax::parse::parse_crate_from_file::h72b9587b203687b8
  24:     0x7fc8dda73bfd - rustc_interface::passes::parse::{{closure}}::h73af6c8d58be2c8e
  25:     0x7fc8dda6e476 - rustc::util::common::time::hedf145db853fee22
  26:     0x7fc8dda12c6f - rustc_interface::passes::parse::h6339ba714c071498
  27:     0x7fc8dda02653 - rustc_interface::queries::Query<T>::compute::h59a144469961cc35
  28:     0x7fc8ddaebb84 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::parse::hc1befc73f5446e68
  29:     0x7fc8de2f3a71 - rustc_interface::interface::run_compiler_in_existing_thread_pool::h14bf4a38c2714175
  30:     0x7fc8de3650a6 - std::thread::local::LocalKey<T>::with::h1ef421860970c1a1
  31:     0x7fc8de2ff0ae - scoped_tls::ScopedKey<T>::set::hae697baf57baa69a
  32:     0x7fc8de331124 - syntax::with_globals::h2ba7ae4c00aa57d8
  33:     0x7fc8de34fdfd - std::sys_common::backtrace::__rust_begin_short_backtrace::hbacd46537732a9e0
  34:     0x7fc8de01181a - __rust_maybe_catch_panic
                               at src/libpanic_unwind/lib.rs:82
  35:     0x7fc8de2dc2d9 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h5f09d41df1db8d36
  36:     0x7fc8ddfe3e1f - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h6a25020f908b1369
                               at /rustc/4edff843dd219cf19a5fede6c78c7ce95402e1f5/src/liballoc/boxed.rs:746
  37:     0x7fc8de010500 - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::he4b68ab6cba491dc
                               at /rustc/4edff843dd219cf19a5fede6c78c7ce95402e1f5/src/liballoc/boxed.rs:746
  38:     0x7fc8de010500 - std::sys_common::thread::start_thread::hf0f92ea133daa112
                               at src/libstd/sys_common/thread.rs:13
  39:     0x7fc8de010500 - std::sys::unix::thread::Thread::new::thread_start::h9d375b1cdab5f2d3
                               at src/libstd/sys/unix/thread.rs:79
  40:     0x7fc8ddf7eef7 - start_thread
  41:     0x7fc8ddea322f - __GI___clone
  42:                0x0 - <unknown>
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 1.37.0-nightly (4edff843d 2019-06-16) running on x86_64-unknown-linux-gnu

out="./huge.rs"
echo 'const HELLO: &str = r"' >$out
yes "hello!!" | head -c 4294967296 >>$out
echo '";fn main() { println!("{}", HELLO); }' >>$out