Rustc panicked at 'found unstable fingerprints...

[mariomatic]

Code

use std::fs::File;
use std::io::Error;


fn main() -> Result<(), Error > {
    let mut f = File::open("d:\\play")?;
    println! ( "{:?}", f.metadata()? );
    Ok(())
}

Meta

rustc --version --verbose:

rustc 1.52.0-beta.7 (9a1dfd2dc 2021-04-30)
binary: rustc
commit-hash: 9a1dfd2dc5c42a2ee84b4606aa08cdadf8c0ee87
commit-date: 2021-04-30
host: x86_64-pc-windows-msvc
release: 1.52.0-beta.7
LLVM version: 12.0.0

Error output

thread 'rustc' panicked at 'found unstable fingerprints for predicates_of(core[c0d5]::ops::function::Fn): GenericPredicates { parent: None, predicates: [(Binder(TraitPredicate(<Self as std::ops::FnMut<Args>>)), C:\Users\mmatic\.rustup\toolchains\beta-x86_64-pc-windows-msvc\lib/rustlib/src/rust\library\core\src\ops\function.rs:67:21: 67:32 (#0)), (Binder(TraitPredicate(<Args as std::marker::Sized>)), C:\Users\mmatic\.rustup\toolchains\beta-x86_64-pc-windows-msvc\lib/rustlib/src/rust\library\core\src\ops\function.rs:67:14: 67:18 (#0)), (Binder(TraitPredicate(<Self as std::ops::Fn<Args>>)), C:\Users\mmatic\.rustup\toolchains\beta-x86_64-pc-windows-msvc\lib/rustlib/src/rust\library\core\src\ops\function.rs:67:1: 67:32 (#0))] }', /rustc/9a1dfd2dc5c42a2ee84b4606aa08cdadf8c0ee87\compiler\rustc_query_system\src\query\plumbing.rs:593:5

Backtrace

stack backtrace:
   0:     0x7fff146f81fe - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hfae6ccd854213db1
   1:     0x7fff1472334c - core::fmt::write::h44ad4f19d689cef1
   2:     0x7fff146ebc58 - <std::io::IoSlice as core::fmt::Debug>::fmt::hef43a6d5a8368ca5
   3:     0x7fff146fc39d - std::panicking::take_hook::h576dd54ad12ab799
   4:     0x7fff146fbe69 - std::panicking::take_hook::h576dd54ad12ab799
   5:     0x7ffedc6fcc77 - rustc_driver::report_ice::h0e8f32f8e59244df
   6:     0x7fff146fcbf5 - std::panicking::rust_panic_with_hook::hb37cfa34adb9ae3b
   7:     0x7fff146fc761 - rust_begin_unwind
   8:     0x7fff146f8b4f - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hfae6ccd854213db1
   9:     0x7fff146fc6b9 - rust_begin_unwind
  10:     0x7fff14754e5c - std::panicking::begin_panic_fmt::hc213a848dd3c30a4
  11:     0x7ffedf2c927c - <rustc_ast_lowering::item::ItemLowerer as rustc_ast::visit::Visitor>::visit_foreign_item::hfd666d4312c2a266
  12:     0x7ffedf2ecb84 - <rustc_ast_lowering::item::ItemLowerer as rustc_ast::visit::Visitor>::visit_foreign_item::hfd666d4312c2a266
  13:     0x7ffedf521b1b - <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::store_diagnostics_for_anon_node::hb5811461be3bf9fd
  14:     0x7ffedf17f890 - <rustc_ast_lowering::item::ItemLowerer as rustc_ast::visit::Visitor>::visit_foreign_item::hfd666d4312c2a266
  15:     0x7ffedf43fabd - <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::try_print_query_stack::hdb6006e63bb98d44
  16:     0x7ffee072c302 - rustc_middle::ty::generics::GenericPredicates::instantiate_identity::hd6560ca2219c0438
  17:     0x7ffee072bfd7 - rustc_middle::ty::generics::GenericPredicates::instantiate_identity::hd6560ca2219c0438
  18:     0x7ffee0346743 - rustc_trait_selection::traits::object_safety::trait_has_sized_self::ha401491b40e947b7
  19:     0x7ffee0362402 - <rustc_trait_selection::autoderef::AutoderefKind as core::fmt::Debug>::fmt::h9d30ed7c3b0ddc93
  20:     0x7ffee0385ef6 - <rustc_trait_selection::traits::select::ProvisionalEvaluation as core::fmt::Debug>::fmt::h09a11af9605709a0
  21:     0x7ffee038f27f - <rustc_trait_selection::traits::select::ProvisionalEvaluation as core::fmt::Debug>::fmt::h09a11af9605709a0
  22:     0x7ffee0ae3122 - serde::private::de::content::Content::unexpected::hcdf7533a6ecf3e66
  23:     0x7ffee03a0399 - <rustc_trait_selection::traits::query::type_op::outlives::DropckOutlives as core::fmt::Debug>::fmt::h8c672a6260f616f4
  24:     0x7ffee036ee6c - rustc_trait_selection::traits::impossible_predicates::ha6883a6941a106f9
  25:     0x7ffedf3067e7 - <rustc_ast_lowering::item::ItemLowerer as rustc_ast::visit::Visitor>::visit_foreign_item::hfd666d4312c2a266
  26:     0x7ffedf507699 - <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::store_diagnostics_for_anon_node::hb5811461be3bf9fd
  27:     0x7ffedf2e58d3 - <rustc_ast_lowering::item::ItemLowerer as rustc_ast::visit::Visitor>::visit_foreign_item::hfd666d4312c2a266
  28:     0x7ffedf51ea23 - <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::store_diagnostics_for_anon_node::hb5811461be3bf9fd
  29:     0x7ffedf1cbe7e - <rustc_ast_lowering::item::ItemLowerer as rustc_ast::visit::Visitor>::visit_foreign_item::hfd666d4312c2a266
  30:     0x7ffedf445cae - <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::try_print_query_stack::hdb6006e63bb98d44
  31:     0x7ffedf830e68 - <rustc_mir::monomorphize::collector::MirNeighborCollector as rustc_middle::mir::visit::Visitor>::visit_rvalue::hdbc596ee232d9751
  32:     0x7ffedf8355cb - <rustc_mir::monomorphize::collector::RootCollector as rustc_hir::itemlikevisit::ItemLikeVisitor>::visit_impl_item::h80686928bd6f6035
  33:     0x7ffedf82ddc3 - rustc_mir::monomorphize::collector::collect_crate_mono_items::h43129fad64ba08dd
  34:     0x7ffedf82c748 - rustc_mir::monomorphize::collector::collect_crate_mono_items::h43129fad64ba08dd
  35:     0x7ffedfb26f89 - rustc_mir::monomorphize::partitioning::partition::h1924b0707b0b680b
  36:     0x7ffedf30978a - <rustc_ast_lowering::item::ItemLowerer as rustc_ast::visit::Visitor>::visit_foreign_item::hfd666d4312c2a266
  37:     0x7ffedf507371 - <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::store_diagnostics_for_anon_node::hb5811461be3bf9fd
  38:     0x7ffedf4765da - <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::try_print_query_stack::hdb6006e63bb98d44
  39:     0x7ffedf52762b - <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::store_diagnostics_for_anon_node::hb5811461be3bf9fd
  40:     0x7ffedf26833b - <rustc_ast_lowering::item::ItemLowerer as rustc_ast::visit::Visitor>::visit_foreign_item::hfd666d4312c2a266
  41:     0x7ffedf21d0bb - <rustc_ast_lowering::item::ItemLowerer as rustc_ast::visit::Visitor>::visit_foreign_item::hfd666d4312c2a266
  42:     0x7ffedf449ec8 - <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::try_print_query_stack::hdb6006e63bb98d44
  43:     0x7ffedc98f23a - <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::h77287877865bcd4f
  44:     0x7ffedc84f6b2 - rustc_interface::passes::BoxedResolver::to_resolver_outputs::h4ec63178a769446e
  45:     0x7ffedc85b4e6 - rustc_interface::queries::Queries::ongoing_codegen::hee71184e618ccde0
  46:     0x7ffedc715b17 - <rustc_middle::ty::SymbolName as core::fmt::Display>::fmt::h143405f70f01b5db
  47:     0x7ffedc6ff97c - <rustc_driver::Compilation as core::fmt::Debug>::fmt::h5e3ec1c3f42432f1
  48:     0x7ffedc716d17 - <rustc_middle::ty::SymbolName as core::fmt::Display>::fmt::h143405f70f01b5db
  49:     0x7ffedc707084 - rustc_driver::pretty::print_after_hir_lowering::hdbb70a4ca15139bc
  50:     0x7ffedc718c6f - <rustc_middle::ty::SymbolName as core::fmt::Display>::fmt::h143405f70f01b5db
  51:     0x7ffedc73876d - <rustc_middle::ty::SymbolName as core::fmt::Display>::fmt::h143405f70f01b5db
  52:     0x7fff1470bc9a - std::sys::windows::thread::Thread::new::h58f8eb2e5a02b455
  53:     0x7fff8f177034 - BaseThreadInitThunk
  54:     0x7fff90e42651 - RtlUserThreadStart

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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.52.0-beta.7 (9a1dfd2dc 2021-04-30) running on x86_64-pc-windows-msvc

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [predicates_of] computing predicates of `std::ops::Fn`
#1 [vtable_methods] finding all methods for trait std::ops::Fn
#2 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack

[JohnTitor]

Should be a duplicate of #84341, it has been fixed on the latest nightly. Updating the toolchain or running cargo clean (or turning off the incremental compilation) should get rid of the ICE. If you still find an ICE, feel free to re-open. Thanks!