thread 'rustc' panicked at 'assertion failed: `(left == right)` left: `10`, right: `1`: this MPlaceTy must come from `try_as_mplace` being used on a zst, so we know what value this integer address must have', compiler/rustc_mir/src/const_eval/eval_queries.rs:150:13 stack backtrace: 0: rust_begin_unwind at /rustc/7f7a1cbfd3b55daee191247770627afab09eece2/library/std/src/panicking.rs:483 1: std::panicking::begin_panic_fmt at /rustc/7f7a1cbfd3b55daee191247770627afab09eece2/library/std/src/panicking.rs:437 2: rustc_mir::const_eval::eval_queries::op_to_const::{{closure}} 3: rustc_mir::const_eval::eval_queries::op_to_const 4: core::ops::function::FnOnce::call_once 5: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::deref_const>::compute 6: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl 7: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}} 8: rustc_query_system::query::plumbing::get_query_impl 9: rustc_mir_build::thir::pattern::const_to_pat::ConstToPat::recur 10: rustc_infer::infer::InferCtxtBuilder::enter 11: rustc_mir_build::thir::pattern::PatCtxt::lower_path 12: rustc_mir_build::thir::pattern::PatCtxt::lower_pattern 13: rustc_mir_build::thir::pattern::check_match::MatchVisitor::lower_pattern 14: <core::iter::adapters::Map<I,F> as core::iter::traits::iterator::Iterator>::fold 15: <rustc_mir_build::thir::pattern::check_match::MatchVisitor as rustc_hir::intravisit::Visitor>::visit_expr 16: rustc_hir::intravisit::walk_expr 17: <rustc_mir_build::thir::pattern::check_match::MatchVisitor as rustc_hir::intravisit::Visitor>::visit_expr 18: rustc_mir_build::thir::pattern::check_match::check_match 19: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::check_match>::compute 20: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl 21: rustc_data_structures::stack::ensure_sufficient_stack 22: rustc_query_system::query::plumbing::get_query_impl 23: rustc_query_system::query::plumbing::ensure_query_impl 24: rustc_session::utils::<impl rustc_session::session::Session>::time 25: rustc_interface::passes::analysis 26: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute 27: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl 28: rustc_data_structures::stack::ensure_sufficient_stack 29: rustc_query_system::query::plumbing::get_query_impl 30: rustc_interface::passes::QueryContext::enter 31: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter 32: rustc_span::with_source_map 33: rustc_interface::interface::create_compiler_and_run 34: scoped_tls::ScopedKey<T>::set note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. 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 1.48.0-nightly (7f7a1cbfd 2020-09-27) running on x86_64-unknown-linux-gnu query stack during panic: