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ICE: no type for local variable #117821

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matthiaskrgr opened this issue Nov 11, 2023 · 3 comments · Fixed by #118010
Closed

ICE: no type for local variable #117821

matthiaskrgr opened this issue Nov 11, 2023 · 3 comments · Fixed by #118010
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@gurry
Labels
C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@matthiaskrgr
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matthiaskrgr commented Nov 11, 2023 •
edited by rustbot
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auto-reduced (treereduce-rust):

fn main() {

    'while_loop: while true {
        break;
        break (None, |mask| {
            let bit = 1 << val;
        });
    }
}
original code

original:

#![feature(never_type)]

fn main() {
    let val: ! = loop { break break; };
    //~^ ERROR mismatched types

    loop {
        if true {
            break "asdf";
        } else {
            break 123; //~ ERROR mismatched types
        }
    };

    let _: i32 = loop {
        break "asdf"; //~ ERROR mismatched types
    };

    let _: i32 = 'outer_loop: loop {
        loop {
            break 'outer_loop "nope"; // entirely acceptable as an identifier. We currently do not attempt
            break "ok";
        };
    };

    'while_loop: while true { //~ WARN denote infinite loops with
        break;
        break (None, |mask| {
            let bit = 1 << val;
            if mask & bit == 0 {Some(mask|bit)} else {None}
        }); //~ ERROR `break` with value from a `while` loop
        loop {
            break 'while_loop 123;
            //~^ ERROR `break` with value from a `while` loop
            break 456;
            break 789;
        };
    }

    while let Some(_) = Some(()) {
        if break () { //~ ERROR `break` with value from a `while` loop
        }
    }

    while let Some(_) = Some(()) {
        break None;
        //~^ ERROR `break` with value from a `while` loop
    }

    'while_let_loop: while let Some(_) = Some(()) {
        loop {
            break 'while_let_loop "nope";
            //~^ ERROR `break` with value from a `while` loop
            break 33;
        };
    }

    for _ in &[1,2,3] {
        break (); //~ ERROR `break` with value from a `for` loop
        break [()];
        //~^ ERROR `break` with value from a `for` loop
    }

    'for_loop: for _ in &[1,2,3] {
        loop {
            break Some(3);
            break 'for_loop Some(17);
            //~^ ERROR `break` with value from a `for` loop
        };
    }

    let _: i32 = 'a: loop {
        let _: () = 'b: loop {
            break ('c: loop {
                break;
                break 'c 123; //~ ERROR mismatched types
            });
            break 'a 123;
        };
    };

    loop {
        break (break, break); //~ ERROR mismatched types
    };

    loop {
        break;
        break 2; //~ ERROR mismatched types
    };

    loop {
        break 2;
        break; //~ ERROR mismatched types
        break 4;
    };

    'LOOP: for _ in 0 .. 9 {
        break LOOP;
        //~^ ERROR cannot find value `LOOP` in this scope
    }

    let _ = 'a: loop {
        loop {
            break; // This doesn't affect the expected break type of the 'a loop
            loop {
                loop {
                    break 'a 1;
                }
            }
        }
        break; //~ ERROR mismatched types
    };

    let _ = 'a: loop {
        loop {
            break; // This doesn't affect the expected break type of the 'a loop
            loop {
                loop {
                    break 'l3 1;
                }
            }
        }
        break 'a; //~ ERROR mismatched types
    };

    loop {
        break;
        let _ = loop {
            break 2;
            loop {
                break;
            }
        };
        break 2; //~ ERROR mismatched types
    }

    'a: loop {
        break;
        let _ = 'a: loop {
            //~^ WARNING label name `'a` shadows a label name that is already in scope
            break 2;
            loop {
                break 'a; //~ ERROR mismatched types
            }
        };
        break 2; //~ ERROR mismatched types
    }

    'a: loop {
        break;
        let _ = 'a: loop {
            //~^ WARNING label name `'a` shadows a label name that is already in scope
            break 'a 2;
            loop {
                break 'a; //~ ERROR mismatched types
            }
        };
        break 2; //~ ERROR mismatched types
    };

    loop { // point at the return type
        break 2; //~ ERROR mismatched types
    }
}

Version information

rustc 1.75.0-nightly (1db4b1249 2023-11-11)
binary: rustc
commit-hash: 1db4b12494f698754b925f55061eb9e6b3241423
commit-date: 2023-11-11
host: x86_64-unknown-linux-gnu
release: 1.75.0-nightly
LLVM version: 17.0.4

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output 

error[E0425]: cannot find value `val` in this scope
 --> /tmp/icemaker_global_tempdir.ooBuJObI5lKd/rustc_testrunner_tmpdir_reporting.FJQt1QIxJXB0/mvce.rs:6:28
  |
6 |             let bit = 1 << val;
  |                            ^^^ not found in this scope

warning: unused label
 --> /tmp/icemaker_global_tempdir.ooBuJObI5lKd/rustc_testrunner_tmpdir_reporting.FJQt1QIxJXB0/mvce.rs:3:5
  |
3 |     'while_loop: while true {
  |     ^^^^^^^^^^^
  |
  = note: `#[warn(unused_labels)]` on by default

warning: denote infinite loops with `loop { ... }`
 --> /tmp/icemaker_global_tempdir.ooBuJObI5lKd/rustc_testrunner_tmpdir_reporting.FJQt1QIxJXB0/mvce.rs:3:5
  |
3 |     'while_loop: while true {
  |     ^^^^^^^^^^^^^^^^^^^^^^^ help: use `loop`
  |
  = note: `#[warn(while_true)]` on by default

error[E0571]: `break` with value from a `while` loop
 --> /tmp/icemaker_global_tempdir.ooBuJObI5lKd/rustc_testrunner_tmpdir_reporting.FJQt1QIxJXB0/mvce.rs:5:9
  |
3 |       'while_loop: while true {
  |       ----------------------- you can't `break` with a value in a `while` loop
4 |           break;
5 | /         break (None, |mask| {
6 | |             let bit = 1 << val;
7 | |         });
  | |__________^ can only break with a value inside `loop` or breakable block
  |
help: use `break` on its own without a value inside this `while` loop
  |
5 |         break;
  |         ~~~~~
help: alternatively, you might have meant to use the available loop label
  |
5 |         break 'while_loop;
  |               ~~~~~~~~~~~

warning: unreachable statement
 --> /tmp/icemaker_global_tempdir.ooBuJObI5lKd/rustc_testrunner_tmpdir_reporting.FJQt1QIxJXB0/mvce.rs:5:9
  |
4 |           break;
  |           ----- any code following this expression is unreachable
5 | /         break (None, |mask| {
6 | |             let bit = 1 << val;
7 | |         });
  | |___________^ unreachable statement
  |
  = note: `#[warn(unreachable_code)]` on by default

error: internal compiler error: compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs:134:13: no type for local variable HirId(DefId(0:3 ~ mvce[5667]::main).19) (local `let bit = 1 << val;`)
 --> /tmp/icemaker_global_tempdir.ooBuJObI5lKd/rustc_testrunner_tmpdir_reporting.FJQt1QIxJXB0/mvce.rs:6:13
  |
6 |             let bit = 1 << val;
  |             ^^^^^^^^^^^^^^^^^^^

thread 'rustc' panicked at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/compiler/rustc_errors/src/lib.rs:1000:33:
Box<dyn Any>
stack backtrace:
   0:     0x7fcfd758b62c - std::backtrace_rs::backtrace::libunwind::trace::h60c98351b446b6fc
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7fcfd758b62c - std::backtrace_rs::backtrace::trace_unsynchronized::h5f7f811450b9c6bf
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fcfd758b62c - std::sys_common::backtrace::_print_fmt::h0d5170c59727098e
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fcfd758b62c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h75fbf13e2e3eab42
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fcfd75de630 - core::fmt::rt::Argument::fmt::hf5a01755b8c97b0f
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/core/src/fmt/rt.rs:142:9
   5:     0x7fcfd75de630 - core::fmt::write::h21ffd88623dd8e8a
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/core/src/fmt/mod.rs:1120:17
   6:     0x7fcfd757f4bf - std::io::Write::write_fmt::h192daa860eac75cb
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/std/src/io/mod.rs:1762:15
   7:     0x7fcfd758b414 - std::sys_common::backtrace::_print::h38432716ce8bcbbd
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fcfd758b414 - std::sys_common::backtrace::print::h1f49e3e8b68963a0
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fcfd758e0a7 - std::panicking::default_hook::{{closure}}::h1ab1b9b9fcc59e11
  10:     0x7fcfd758de0f - std::panicking::default_hook::h052ad26defc2b2d9
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/std/src/panicking.rs:292:9
  11:     0x7fcfda2ef410 - std[d0bee0584bbc47af]::panicking::update_hook::<alloc[dbc0aa70caf49578]::boxed::Box<rustc_driver_impl[cdb930f4dd583f9b]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7fcfd758e7e8 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h80a3a3c1c2830f76
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/alloc/src/boxed.rs:2021:9
  13:     0x7fcfd758e7e8 - std::panicking::rust_panic_with_hook::hd1cd0e2bf5e3508a
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/std/src/panicking.rs:783:13
  14:     0x7fcfda484394 - std[d0bee0584bbc47af]::panicking::begin_panic::<rustc_errors[666b6562ed3116f9]::ExplicitBug>::{closure#0}
  15:     0x7fcfda470756 - std[d0bee0584bbc47af]::sys_common::backtrace::__rust_end_short_backtrace::<std[d0bee0584bbc47af]::panicking::begin_panic<rustc_errors[666b6562ed3116f9]::ExplicitBug>::{closure#0}, !>
  16:     0x7fcfda465206 - std[d0bee0584bbc47af]::panicking::begin_panic::<rustc_errors[666b6562ed3116f9]::ExplicitBug>
  17:     0x7fcfda456d9e - <rustc_errors[666b6562ed3116f9]::HandlerInner>::span_bug::<rustc_span[c2bda87e20783fc8]::span_encoding::Span, alloc[dbc0aa70caf49578]::string::String>
  18:     0x7fcfda4569e8 - <rustc_errors[666b6562ed3116f9]::Handler>::span_bug::<rustc_span[c2bda87e20783fc8]::span_encoding::Span, alloc[dbc0aa70caf49578]::string::String>
  19:     0x7fcfda486feb - rustc_middle[8d21d7bf35089fff]::util::bug::opt_span_bug_fmt::<rustc_span[c2bda87e20783fc8]::span_encoding::Span>::{closure#0}
  20:     0x7fcfda4877ba - rustc_middle[8d21d7bf35089fff]::ty::context::tls::with_opt::<rustc_middle[8d21d7bf35089fff]::util::bug::opt_span_bug_fmt<rustc_span[c2bda87e20783fc8]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7fcfda478068 - rustc_middle[8d21d7bf35089fff]::ty::context::tls::with_context_opt::<rustc_middle[8d21d7bf35089fff]::ty::context::tls::with_opt<rustc_middle[8d21d7bf35089fff]::util::bug::opt_span_bug_fmt<rustc_span[c2bda87e20783fc8]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7fcfd9583224 - rustc_middle[8d21d7bf35089fff]::util::bug::span_bug_fmt::<rustc_span[c2bda87e20783fc8]::span_encoding::Span>
  23:     0x7fcfdbd0aa9b - <rustc_hir_typeck[48a7925dd0d8cef4]::writeback::WritebackCx as rustc_hir[b271daaa5d05d7e4]::intravisit::Visitor>::visit_local
  24:     0x7fcfd84adf80 - <rustc_hir_typeck[48a7925dd0d8cef4]::writeback::WritebackCx as rustc_hir[b271daaa5d05d7e4]::intravisit::Visitor>::visit_expr
  25:     0x7fcfd84aeb83 - <rustc_hir_typeck[48a7925dd0d8cef4]::writeback::WritebackCx as rustc_hir[b271daaa5d05d7e4]::intravisit::Visitor>::visit_expr
  26:     0x7fcfd84adc2d - <rustc_hir_typeck[48a7925dd0d8cef4]::writeback::WritebackCx as rustc_hir[b271daaa5d05d7e4]::intravisit::Visitor>::visit_expr
  27:     0x7fcfd84ae015 - <rustc_hir_typeck[48a7925dd0d8cef4]::writeback::WritebackCx as rustc_hir[b271daaa5d05d7e4]::intravisit::Visitor>::visit_expr
  28:     0x7fcfd84adf5a - <rustc_hir_typeck[48a7925dd0d8cef4]::writeback::WritebackCx as rustc_hir[b271daaa5d05d7e4]::intravisit::Visitor>::visit_expr
  29:     0x7fcfd84ae731 - <rustc_hir_typeck[48a7925dd0d8cef4]::writeback::WritebackCx as rustc_hir[b271daaa5d05d7e4]::intravisit::Visitor>::visit_expr
  30:     0x7fcfd84af0d1 - <rustc_hir_typeck[48a7925dd0d8cef4]::writeback::WritebackCx as rustc_hir[b271daaa5d05d7e4]::intravisit::Visitor>::visit_expr
  31:     0x7fcfd84af0d1 - <rustc_hir_typeck[48a7925dd0d8cef4]::writeback::WritebackCx as rustc_hir[b271daaa5d05d7e4]::intravisit::Visitor>::visit_expr
  32:     0x7fcfdbfc7dac - <rustc_hir_typeck[48a7925dd0d8cef4]::fn_ctxt::FnCtxt>::resolve_type_vars_in_body
  33:     0x7fcfdb91a721 - rustc_hir_typeck[48a7925dd0d8cef4]::typeck
  34:     0x7fcfdb918b93 - rustc_query_impl[26ab2eb5a4b73d01]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[26ab2eb5a4b73d01]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8d21d7bf35089fff]::query::erase::Erased<[u8; 8usize]>>
  35:     0x7fcfdb6eb4c3 - rustc_query_system[b68b7660e1b83fb7]::query::plumbing::try_execute_query::<rustc_query_impl[26ab2eb5a4b73d01]::DynamicConfig<rustc_query_system[b68b7660e1b83fb7]::query::caches::VecCache<rustc_span[c2bda87e20783fc8]::def_id::LocalDefId, rustc_middle[8d21d7bf35089fff]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[26ab2eb5a4b73d01]::plumbing::QueryCtxt, false>
  36:     0x7fcfdb6eb150 - rustc_query_impl[26ab2eb5a4b73d01]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  37:     0x7fcfdbbdf3c0 - rustc_hir_analysis[5a62dd6b63ca128a]::check_crate
  38:     0x7fcfdb958517 - rustc_interface[97b84efa53a847bb]::passes::analysis
  39:     0x7fcfdb958177 - rustc_query_impl[26ab2eb5a4b73d01]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[26ab2eb5a4b73d01]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8d21d7bf35089fff]::query::erase::Erased<[u8; 1usize]>>
  40:     0x7fcfdc5986e4 - rustc_query_system[b68b7660e1b83fb7]::query::plumbing::try_execute_query::<rustc_query_impl[26ab2eb5a4b73d01]::DynamicConfig<rustc_query_system[b68b7660e1b83fb7]::query::caches::SingleCache<rustc_middle[8d21d7bf35089fff]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[26ab2eb5a4b73d01]::plumbing::QueryCtxt, false>
  41:     0x7fcfdc5984d5 - rustc_query_impl[26ab2eb5a4b73d01]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  42:     0x7fcfdc5a10ff - rustc_interface[97b84efa53a847bb]::interface::run_compiler::<core[e724bad1857b6bd7]::result::Result<(), rustc_span[c2bda87e20783fc8]::ErrorGuaranteed>, rustc_driver_impl[cdb930f4dd583f9b]::run_compiler::{closure#1}>::{closure#0}
  43:     0x7fcfdc5a841a - std[d0bee0584bbc47af]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[97b84efa53a847bb]::util::run_in_thread_with_globals<rustc_interface[97b84efa53a847bb]::util::run_in_thread_pool_with_globals<rustc_interface[97b84efa53a847bb]::interface::run_compiler<core[e724bad1857b6bd7]::result::Result<(), rustc_span[c2bda87e20783fc8]::ErrorGuaranteed>, rustc_driver_impl[cdb930f4dd583f9b]::run_compiler::{closure#1}>::{closure#0}, core[e724bad1857b6bd7]::result::Result<(), rustc_span[c2bda87e20783fc8]::ErrorGuaranteed>>::{closure#0}, core[e724bad1857b6bd7]::result::Result<(), rustc_span[c2bda87e20783fc8]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e724bad1857b6bd7]::result::Result<(), rustc_span[c2bda87e20783fc8]::ErrorGuaranteed>>
  44:     0x7fcfdc5a8243 - <<std[d0bee0584bbc47af]::thread::Builder>::spawn_unchecked_<rustc_interface[97b84efa53a847bb]::util::run_in_thread_with_globals<rustc_interface[97b84efa53a847bb]::util::run_in_thread_pool_with_globals<rustc_interface[97b84efa53a847bb]::interface::run_compiler<core[e724bad1857b6bd7]::result::Result<(), rustc_span[c2bda87e20783fc8]::ErrorGuaranteed>, rustc_driver_impl[cdb930f4dd583f9b]::run_compiler::{closure#1}>::{closure#0}, core[e724bad1857b6bd7]::result::Result<(), rustc_span[c2bda87e20783fc8]::ErrorGuaranteed>>::{closure#0}, core[e724bad1857b6bd7]::result::Result<(), rustc_span[c2bda87e20783fc8]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e724bad1857b6bd7]::result::Result<(), rustc_span[c2bda87e20783fc8]::ErrorGuaranteed>>::{closure#1} as core[e724bad1857b6bd7]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  45:     0x7fcfd75986a5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf4cdd73175754799
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/alloc/src/boxed.rs:2007:9
  46:     0x7fcfd75986a5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6955d1f30cee8d29
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/alloc/src/boxed.rs:2007:9
  47:     0x7fcfd75986a5 - std::sys::unix::thread::Thread::new::thread_start::h58dae6c91eb60bce
                               at /rustc/1db4b12494f698754b925f55061eb9e6b3241423/library/std/src/sys/unix/thread.rs:108:17
  48:     0x7fcfd73899eb - <unknown>
  49:     0x7fcfd740d7cc - <unknown>
  50:                0x0 - <unknown>

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 1.75.0-nightly (1db4b1249 2023-11-11) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [typeck] type-checking `main`
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors; 3 warnings emitted

Some errors have detailed explanations: E0425, E0571.
For more information about an error, try `rustc --explain E0425`.

@matthiaskrgr matthiaskrgr added I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. C-bug Category: This is a bug. labels Nov 11, 2023
@rustbot rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Nov 11, 2023
@matthiaskrgr
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Regression in nightly-2023-10-31
Regression in #117387 => #117382 ping @gurry

@matthiaskrgr
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reduced a bit further:

fn main() {
    'while_loop: while true {
        break (|| {
            let binding = 0;
        });
    }
}

@saethlin saethlin removed the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Nov 11, 2023
@gurry
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gurry commented Nov 12, 2023

@rustbot claim

@gurry gurry mentioned this issue Nov 17, 2023
Merged
@bors bors closed this as completed in 1936e2c Nov 21, 2023
rust-timer added a commit to rust-lang-ci/rust that referenced this issue Nov 21, 2023
@rust-timer
Unrolled build for rust-lang#118010
f4edc8d 
Rollup merge of rust-lang#118010 - gurry:117821-ice-no-type-for-local-var, r=compiler-errors

Typeck break expr even if break is illegal

Fixes rust-lang#117821

We were returning immediately when encountering an illegal break. However, this caused problems later when the expr that the break was returning was evaluated during writeback. So now we don't return and instead simply set tainted by error. This lets typeck of break expr to occur even though we've encountered an illegal break.
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C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Typeck break expr even if break is illegal gurry/rust
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@matthiaskrgr @gurry @saethlin @rustbot