ICE: 'rustc' panicked at 'assertion failed: !substs.has_regions_escaping_depth(0)'

[petrochenkov]

Code:

use std::marker::PhantomData;

fn f<'a>(PhantomData::<&'a u8>: PhantomData<&'a u8>) {}

fn main() {}

ICEs on stable/beta/nightly.

Backtrace:

#0  0x000000006e55e727 in rust_panic ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\std-f53fb285.dll
#1  0x000000006e544e2c in std::panicking::rust_panic_with_hook::hff406a2d53fd3a8a ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\std-f53fb285.dll
#2  0x0000000067a81464 in std::panicking::begin_panic::h7a5a31993347e9ec ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_typeck-f53fb285.dll
#3  0x0000000067b02537 in rustc_typeck::check::FnCtxt::instantiate_value_path::hd4af43121728875c ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_typeck-f53fb285.dll
#4  0x0000000067ab2dba in rustc_typeck::check::_match::_$LT$impl$u20$check..FnCtxt$LT$$u27$a$C$$u20$$u27$gcx$C$$u20$$u27$tcx$GT$$GT$::check_pat::h5874e11e18e036cd ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_typeck-f53fb285.dll
#5  0x0000000067aabf61 in rustc_typeck::check::check_fn::hedf1b94becbdc550 ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_typeck-f53fb285.dll
#6  0x0000000067aa1d89 in rustc_typeck::check::check_bare_fn::haac232c6a78527e7 ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_typeck-f53fb285.dll
#7  0x0000000067a9d25f in rustc_typeck::check::check_item_body::hca9847fe73b73821 ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_typeck-f53fb285.dll
#8  0x0000000067a94672 in rustc_typeck::check::check_item_bodies::h0129b02cf3aee3c1 ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_typeck-f53fb285.dll
#9  0x0000000067a892e2 in rustc_typeck::check_crate::hf9d573c002b16fbd ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_typeck-f53fb285.dll
#10 0x000000006ac97e25 in rustc_driver::driver::phase_3_run_analysis_passes::_$u7b$$u7b$closure$u7d$$u7d$::hab5b4af6b2e2861f ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_driver-f53fb285.dll
#11 0x000000006ac95d56 in rustc::ty::context::TyCtxt::create_and_enter::hc30a91872bbf912b ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_driver-f53fb285.dll
#12 0x000000006ac5a782 in rustc_driver::driver::compile_input::h2d1b58b831f06a86 ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_driver-f53fb285.dll
#13 0x000000006ac4697d in rustc_driver::run_compiler::h833483649bdaa9c3 ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_driver-f53fb285.dll
#14 0x000000006ac438ba in std::panicking::try::call::hf1c34f6ae15d2786 ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_driver-f53fb285.dll
#15 0x000000006e58f6f9 in __rust_maybe_catch_panic ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\std-f53fb285.dll
#16 0x000000006ac443b4 in _$LT$F$u20$as$u20$std..boxed..FnBox$LT$A$GT$$GT$::call_box::h7d06daf297860d37 ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\rustc_driver-f53fb285.dll
#17 0x000000006e57d32a in std::sys::thread::Thread::new::thread_start::h150ac04d84605902 ()
   from C:\msys64\home\rust\x86_64-pc-windows-gnu\stage1\bin\std-f53fb285.dll
#18 0x00000000770659bd in KERNEL32!BaseThreadInitThunk ()
   from C:\Windows\system32\kernel32.dll
#19 0x000000007729a2e1 in ntdll!RtlUserThreadStart ()
   from C:\Windows\SYSTEM32\ntdll.dll
#20 0x0000000000000000 in ?? ()

[petrochenkov]

Fixed in 1.16.0, needs test.

rustc 1.16.0-beta.2 (bc15d5281 2017-02-16)
warning: function is never used: `f`, #[warn(dead_code)] on by default
 --> <anon>:3:1
  |
3 | fn f<'a>(PhantomData::<&'a u8>: PhantomData<&'a u8>) {}
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^