Compiler panic: feature(let_chains)

[mareq]

Code

#![feature(let_chains)]
...snip...
use sqlx::PgPool;
...snip...
#[async_std::main]
async fn main() -> tide::Result<()> {
...snip...
    if let Some(_) = postgres_reset && let Some(connected_postgres) = postgres {
        reset_postgres(connected_postgres)?;
    }
...snip...
    Ok(())
}

Meta

rustc --version --verbose:

$ rustc --version --verbose
rustc 1.52.0-nightly (3f5aee2d5 2021-02-12)
binary: rustc
commit-hash: 3f5aee2d5241139d808f4fdece0026603489afd1
commit-date: 2021-02-12
host: x86_64-unknown-linux-gnu
release: 1.52.0-nightly
LLVM version: 11.0.1

Error output

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-nightly (3f5aee2d5 2021-02-12) running on x86_64-unknown-linux-gnu

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:
end of query stack

Backtrace

   0:     0x7fdf8633ec70 - std::backtrace_rs::backtrace::libunwind::trace::hb4de9797f80b7b8c
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x7fdf8633ec70 - std::backtrace_rs::backtrace::trace_unsynchronized::h59566d0bd20efff7
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fdf8633ec70 - std::sys_common::backtrace::_print_fmt::hcfa5ce6be50275d4
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fdf8633ec70 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hd8c307a38b9bab04
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7fdf863afeec - core::fmt::write::h3868db8542c90941
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/core/src/fmt/mod.rs:1096:17
   5:     0x7fdf86331ba2 - std::io::Write::write_fmt::hab90295d5a0f197d
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/io/mod.rs:1568:15
   6:     0x7fdf86342b55 - std::sys_common::backtrace::_print::h19224910b8700cf1
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7fdf86342b55 - std::sys_common::backtrace::print::h25dedfa68c5fb84a
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7fdf86342b55 - std::panicking::default_hook::{{closure}}::h12c5765653a72a42
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/panicking.rs:208:50
   9:     0x7fdf863426b3 - std::panicking::default_hook::he65cee71c4209f0c
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/panicking.rs:225:9
  10:     0x7fdf86b9d52b - rustc_driver::report_ice::h9bfcf5769c15fbf2
  11:     0x7fdf74b3a866 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hf172061590dc818b
                               at /home/mareq/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1562:9
  12:     0x7fdf74b3b689 - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::{{closure}}::h66eefe9f42ea6bce
                               at /home/mareq/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/bridge/client.rs:320:21
  13:     0x7fdf86343456 - std::panicking::rust_panic_with_hook::h01a674d863fe0d8a
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/panicking.rs:595:17
  14:     0x7fdf86342f77 - std::panicking::begin_panic_handler::{{closure}}::h9b9fecf185178864
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/panicking.rs:497:13
  15:     0x7fdf8633f10c - std::sys_common::backtrace::__rust_end_short_backtrace::h57be46a42dc7f24b
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/sys_common/backtrace.rs:141:18
  16:     0x7fdf86342ed9 - rust_begin_unwind
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/panicking.rs:493:5
  17:     0x7fdf86342e8b - std::panicking::begin_panic_fmt::h12277576db89392f
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/panicking.rs:435:5
  18:     0x7fdf88772b7e - rustc_ast_lowering::LoweringContext::lower_node_id_generic::hf147b46663c9016c
  19:     0x7fdf8876d533 - rustc_ast_lowering::path::<impl rustc_ast_lowering::LoweringContext>::lower_qpath::h090d8042e0bdcfdb
  20:     0x7fdf88780aa4 - rustc_data_structures::stack::ensure_sufficient_stack::h1eb7da3bdd0230e9
  21:     0x7fdf8878579a - <smallvec::SmallVec<A> as core::iter::traits::collect::Extend<<A as smallvec::Array>::Item>>::extend::h8e377630664dfc33
  22:     0x7fdf8876578f - rustc_ast_lowering::expr::<impl rustc_ast_lowering::LoweringContext>::lower_exprs::h11a1b46cd3c20941
  23:     0x7fdf88780d07 - rustc_data_structures::stack::ensure_sufficient_stack::h1eb7da3bdd0230e9
  24:     0x7fdf89336589 - rustc_ast_lowering::expr::<impl rustc_ast_lowering::LoweringContext>::lower_expr_try::ha12737f8f3ca90fd
  25:     0x7fdf887815f7 - rustc_data_structures::stack::ensure_sufficient_stack::h1eb7da3bdd0230e9
  26:     0x7fdf8877a1fb - rustc_ast_lowering::LoweringContext::lower_stmt::h5d21732a1ccddea4
  27:     0x7fdf88764aba - core::ops::function::impls::<impl core::ops::function::FnMut<A> for &mut F>::call_mut::he04b241b1704b110
  28:     0x7fdf887846a9 - <core::iter::adapters::flatten::Flatten<I> as core::iter::traits::iterator::Iterator>::next::h7d1cf3a16151d387
  29:     0x7fdf88785b13 - <smallvec::SmallVec<A> as core::iter::traits::collect::Extend<<A as smallvec::Array>::Item>>::extend::h8e7828aaac813db9
  30:     0x7fdf8877c246 - rustc_arena::cold_path::h62f5e8b09cf18d4e
  31:     0x7fdf8932fc78 - rustc_ast_lowering::expr::<impl rustc_ast_lowering::LoweringContext>::lower_expr_if::hb12cdca7d720af72
  32:     0x7fdf8878145f - rustc_data_structures::stack::ensure_sufficient_stack::h1eb7da3bdd0230e9
  33:     0x7fdf8877a6dd - rustc_ast_lowering::LoweringContext::lower_stmt::h5d21732a1ccddea4
  34:     0x7fdf88764aba - core::ops::function::impls::<impl core::ops::function::FnMut<A> for &mut F>::call_mut::he04b241b1704b110
  35:     0x7fdf887846a9 - <core::iter::adapters::flatten::Flatten<I> as core::iter::traits::iterator::Iterator>::next::h7d1cf3a16151d387
  36:     0x7fdf88785b13 - <smallvec::SmallVec<A> as core::iter::traits::collect::Extend<<A as smallvec::Array>::Item>>::extend::h8e7828aaac813db9
  37:     0x7fdf8877c246 - rustc_arena::cold_path::h62f5e8b09cf18d4e
  38:     0x7fdf88779f8e - rustc_ast_lowering::LoweringContext::lower_block::h971d1d3737ccc357
  39:     0x7fdf887811d2 - rustc_data_structures::stack::ensure_sufficient_stack::h1eb7da3bdd0230e9
  40:     0x7fdf88764a50 - core::ops::function::impls::<impl core::ops::function::FnMut<A> for &mut F>::call_mut::he04b241b1704b110
  41:     0x7fdf887846a9 - <core::iter::adapters::flatten::Flatten<I> as core::iter::traits::iterator::Iterator>::next::h7d1cf3a16151d387
  42:     0x7fdf88785b13 - <smallvec::SmallVec<A> as core::iter::traits::collect::Extend<<A as smallvec::Array>::Item>>::extend::h8e7828aaac813db9
  43:     0x7fdf8877c246 - rustc_arena::cold_path::h62f5e8b09cf18d4e
  44:     0x7fdf8876a6a8 - rustc_ast_lowering::item::<impl rustc_ast_lowering::LoweringContext>::lower_maybe_async_body::hfbc5687fa6ebc7e1
  45:     0x7fdf8876735e - rustc_ast_lowering::item::<impl rustc_ast_lowering::LoweringContext>::lower_item::h8213f479c0798312
  46:     0x7fdf887743d5 - rustc_ast_lowering::LoweringContext::with_hir_id_owner::h716ec6a273281522
  47:     0x7fdf887919e6 - rustc_ast::visit::walk_stmt::hcd16e9255f4285fa
  48:     0x7fdf8878c666 - rustc_ast::visit::walk_fn::h49a1efb3d179bf03
  49:     0x7fdf8878f5e2 - rustc_ast::visit::walk_item::h8f8574c432a26e18
  50:     0x7fdf88765f29 - rustc_ast_lowering::item::<impl rustc_ast_lowering::LoweringContext>::with_parent_item_lifetime_defs::hf3a1308574c37413
  51:     0x7fdf8877f1dc - <rustc_ast_lowering::item::ItemLowerer as rustc_ast::visit::Visitor>::visit_mod::h4d4c359e05d8ecf3
  52:     0x7fdf887700f6 - rustc_ast_lowering::lower_crate::h044777afc0a38ccc
  53:     0x7fdf88f35e9f - rustc_interface::passes::BoxedResolver::access::{{closure}}::had62fd3aa3635716
  54:     0x7fdf88f20f84 - rustc_interface::passes::configure_and_expand::{{closure}}::hf2412f09eb5bc869
  55:     0x7fdf88f2fb1e - rustc_interface::queries::Queries::lower_to_hir::h01de47237772b802
  56:     0x7fdf88f32cee - rustc_interface::queries::Queries::global_ctxt::h1dd84911e01ce7e5
  57:     0x7fdf88ec87c7 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h2ac7000621882a7f
  58:     0x7fdf88ec1391 - rustc_span::with_source_map::h9c33ff8439fe9783
  59:     0x7fdf88ec80b3 - scoped_tls::ScopedKey<T>::set::h0eb8893a0191dbc1
  60:     0x7fdf88ec9ac8 - std::sys_common::backtrace::__rust_begin_short_backtrace::hccc56e59b0e3233c
  61:     0x7fdf88ea819a - core::ops::function::FnOnce::call_once{{vtable.shim}}::h09f6484b7e2514ef
  62:     0x7fdf86353dda - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h321523073ee11258
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/alloc/src/boxed.rs:1548:9
  63:     0x7fdf86353dda - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf0e85e12c83b99b3
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/alloc/src/boxed.rs:1548:9
  64:     0x7fdf86353dda - std::sys::unix::thread::Thread::new::thread_start::hba22c7961aa0e2f8
                               at /rustc/3f5aee2d5241139d808f4fdece0026603489afd1/library/std/src/sys/unix/thread.rs:71:17
  65:     0x7fdf86261fb7 - start_thread
  66:     0x7fdf861812cf - __clone
  67:                0x0 - <unknown>

[fanninpm]

@jyn514 Minimization:

#![feature(let_chains)]
#[async_std::main]
async fn main() -> Result<()> {
    if let Some(_) = 2 && let Some(sixteen) = 16 {
        isize::from_str_radix("A", sixteen)?;
    }
    Ok(())
}

Playground link

[jyn514]

Even smaller:

#![feature(let_chains)]
fn main() {
    if let Some(_) = 2 && let Some(sixteen) = 16 {
        let _ = sixteen;
    }
}

Which means this is a duplicate of #82290 and #82250.