Rust: async fn ICEs in macro on stable

Created on 1 Jan 2020 · 7Comments · Source: rust-lang/rust

I was migrating my library (Mammut) to use reqwest 0.10 and be async, and the compiler ICEd. I don't know how to reduce it further than this.

I tried this code:

https://github.com/XAMPPRocky/Mammut/commit/f30bdec5649c2a05526ea5e6a51beec1c97a7915#diff-b4aea3e418ccdb71239b96952d9cddb6

I expected to see this happen: A successful build or another compile error

Instead, this happened: thread 'rustc' panicked at 'no entry found for key', src/libcore/option.rs:1188:5

Meta

I also tried this on the latest nightly and it emits the same error.
rustc --version --verbose:

rustc 1.40.0 (73528e339 2019-12-16)
binary: rustc
commit-hash: 73528e339aae0f17a15ffa49a8ac608f50c6cf14
commit-date: 2019-12-16
host: x86_64-apple-darwin
release: 1.40.0
LLVM version: 9.0

Backtrace:

       Fresh cfg-if v0.1.9
       Fresh lazy_static v1.4.0
       Fresh fnv v1.0.6
       Fresh itoa v0.4.4
       Fresh unicode-xid v0.2.0
       Fresh version_check v0.1.5
       Fresh bytes v0.5.3
       Fresh ppv-lite86 v0.2.5
       Fresh slab v0.4.2
       Fresh pin-project-lite v0.1.1
       Fresh smallvec v0.6.10
       Fresh matches v0.1.8
       Fresh autocfg v0.1.6
       Fresh futures-core v0.3.1
       Fresh pin-utils v0.1.0-alpha.4
       Fresh futures-sink v0.3.1
       Fresh futures-task v0.3.1
       Fresh remove_dir_all v0.5.2
       Fresh try-lock v0.2.2
       Fresh indexmap v1.1.0
       Fresh tower-service v0.3.0
       Fresh percent-encoding v2.1.0
       Fresh dtoa v0.4.4
       Fresh percent-encoding v1.0.1
       Fresh base64 v0.11.0
       Fresh language-tags v0.2.2
       Fresh c2-chacha v0.2.2
       Fresh http v0.2.0
       Fresh unicode-normalization v0.1.8
       Fresh unicode-bidi v0.3.4
       Fresh futures-channel v0.3.1
       Fresh futures-util v0.3.1
       Fresh libc v0.2.66
       Fresh log v0.4.8
       Fresh proc-macro2 v1.0.1
       Fresh memchr v2.2.1
       Fresh core-foundation-sys v0.6.2
       Fresh byteorder v1.3.2
       Fresh httparse v1.3.4
       Fresh serde v1.0.99
       Fresh http-body v0.3.1
       Fresh idna v0.2.0
       Fresh idna v0.1.5
       Fresh ryu v1.0.0
       Fresh encoding_rs v0.8.17
       Fresh doc-comment v0.3.1
       Fresh iovec v0.1.4
       Fresh getrandom v0.1.11
       Fresh net2 v0.2.33
       Fresh quote v1.0.2
       Fresh unicase v2.4.0
       Fresh core-foundation v0.6.4
       Fresh security-framework-sys v0.3.1
       Fresh time v0.1.42
       Fresh want v0.3.0
       Fresh base64 v0.10.1
       Fresh num-traits v0.2.8
       Fresh url v2.1.0
       Fresh url v1.7.2
       Fresh serde_json v1.0.40
       Fresh rand_core v0.5.1
       Fresh mio v0.6.21
       Fresh syn v1.0.5
       Fresh security-framework v0.3.1
       Fresh mime v0.3.13
       Fresh bytes v0.4.12
       Fresh rand_chacha v0.2.1
       Fresh serde_urlencoded v0.6.1
       Fresh num-integer v0.1.41
       Fresh tokio v0.2.6
       Fresh rand v0.7.0
       Fresh pin-project-internal v0.4.6
       Fresh http v0.1.18
       Fresh serde_derive v1.0.99
       Fresh tokio-util v0.2.0
       Fresh tempfile v3.1.0
       Fresh pin-project v0.4.6
       Fresh mime_guess v2.0.1
       Fresh hyperx v0.15.1
       Fresh chrono v0.4.7
       Fresh h2 v0.2.1
       Fresh native-tls v0.2.3
       Fresh hyper v0.13.1
       Fresh tokio-tls v0.3.0
       Fresh hyper-tls v0.4.0
       Fresh reqwest v0.10.0
   Compiling mammut v0.13.0 (/Users/ep/src/rust/mammut)
     Running `rustc --edition=2018 --crate-name mammut src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C debuginfo=2 -C metadata=c809cf0fdf8620be -C extra-filename=-c809cf0fdf8620be --out-dir /Users/ep/src/rust/mammut/target/debug/deps -C incremental=/Users/ep/src/rust/mammut/target/debug/incremental -L dependency=/Users/ep/src/rust/mammut/target/debug/deps --extern chrono=/Users/ep/src/rust/mammut/target/debug/deps/libchrono-72684b2f28e9fe2c.rmeta --extern doc_comment=/Users/ep/src/rust/mammut/target/debug/deps/libdoc_comment-3f3009ca6b5845ea.rmeta --extern hyperx=/Users/ep/src/rust/mammut/target/debug/deps/libhyperx-58cd697042051998.rmeta --extern log=/Users/ep/src/rust/mammut/target/debug/deps/liblog-43677abba509ad49.rmeta --extern reqwest=/Users/ep/src/rust/mammut/target/debug/deps/libreqwest-6f1b39962470a51c.rmeta --extern serde=/Users/ep/src/rust/mammut/target/debug/deps/libserde-7aa2ed46f2c9d0ab.rmeta --extern serde_derive=/Users/ep/src/rust/mammut/target/debug/deps/libserde_derive-5701627921a25966.dylib --extern serde_json=/Users/ep/src/rust/mammut/target/debug/deps/libserde_json-14989846f8d6cd6d.rmeta --extern url=/Users/ep/src/rust/mammut/target/debug/deps/liburl-63a14c7395b66a8f.rmeta -C target-cpu=native`
thread 'rustc' panicked at 'no entry found for key', src/libcore/option.rs:1185:5
stack backtrace:
   0:        0x10e766b75 - <unknown>
   1:        0x10e79dcc0 - <unknown>
   2:        0x10e75a47b - <unknown>
   3:        0x10e76af83 - <unknown>
   4:        0x10e76ac8a - <unknown>
   5:        0x10bc05562 - <unknown>
   6:        0x10e76b79c - <unknown>
   7:        0x10e76b229 - <unknown>
   8:        0x10e76b129 - <unknown>
   9:        0x10e79733c - <unknown>
  10:        0x10e79744e - <unknown>
  11:        0x10d04364a - <unknown>
  12:        0x10bff2272 - <unknown>
  13:        0x10cd26bf0 - <unknown>
  14:        0x10cd24150 - <unknown>
  15:        0x10cd1edfe - <unknown>
  16:        0x10bccc87c - <unknown>
  17:        0x10bccaf32 - <unknown>
  18:        0x10bd1afb0 - <unknown>
  19:        0x10bcf6507 - <unknown>
  20:        0x10bcd0e28 - <unknown>
  21:        0x10bce9d4c - <unknown>
  22:        0x10bc41b23 - <unknown>
  23:        0x10bc258b4 - <unknown>
  24:        0x10bc23ad2 - <unknown>
  25:        0x10bc4d945 - <unknown>
  26:        0x10bc606ad - <unknown>
  27:        0x10e77ad2f - <unknown>
  28:        0x10bc61157 - <unknown>
  29:        0x10e74ca1e - <unknown>
  30:        0x10e779a6e - <unknown>
  31:     0x7fff697d6e65 - <unknown>

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/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.40.0 (73528e339 2019-12-16) running on x86_64-apple-darwin

note: compiler flags: -C debuginfo=2 -C incremental -C target-cpu=native --crate-type lib

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

query stack during panic:
end of query stack
error: could not compile `mammut`.

Caused by:
  process didn't exit successfully: `rustc --edition=2018 --crate-name mammut src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C debuginfo=2 -C metadata=c809cf0fdf8620be -C extra-filename=-c809cf0fdf8620be --out-dir /Users/ep/src/rust/mammut/target/debug/deps -C incremental=/Users/ep/src/rust/mammut/target/debug/incremental -L dependency=/Users/ep/src/rust/mammut/target/debug/deps --extern chrono=/Users/ep/src/rust/mammut/target/debug/deps/libchrono-72684b2f28e9fe2c.rmeta --extern doc_comment=/Users/ep/src/rust/mammut/target/debug/deps/libdoc_comment-3f3009ca6b5845ea.rmeta --extern hyperx=/Users/ep/src/rust/mammut/target/debug/deps/libhyperx-58cd697042051998.rmeta --extern log=/Users/ep/src/rust/mammut/target/debug/deps/liblog-43677abba509ad49.rmeta --extern reqwest=/Users/ep/src/rust/mammut/target/debug/deps/libreqwest-6f1b39962470a51c.rmeta --extern serde=/Users/ep/src/rust/mammut/target/debug/deps/libserde-7aa2ed46f2c9d0ab.rmeta --extern serde_derive=/Users/ep/src/rust/mammut/target/debug/deps/libserde_derive-5701627921a25966.dylib --extern serde_json=/Users/ep/src/rust/mammut/target/debug/deps/libserde_json-14989846f8d6cd6d.rmeta --extern url=/Users/ep/src/rust/mammut/target/debug/deps/liburl-63a14c7395b66a8f.rmeta -C target-cpu=native` (exit code: 101)

A-async-await A-macros AsyncAwait-OnDeck AsyncAwait-Triaged C-bug I-ICE P-high T-compiler

Source

XAMPPRocky

Most helpful comment

Reduced (playground):

macro_rules! doc_comment {
    ($x: expr, $($tt: tt)*) => {
        #[doc = $x]
        $($tt)*
    };
}

macro_rules! paged_routes {
     ($($rest: tt)* ) => {
         doc_comment! {
            concat!("", ""), 
            async fn name() {} 
        } 
        paged_routes! {
            $($rest)* 
        } 
    }; 
    () => {} 
}
impl Mastodon {
    paged_routes! {
    }
}

lqd on 7 Jan 2020

❤4

All 7 comments

Reproduced with lastest nighlty:

thread 'rustc' panicked at 'no entry found for key', src/libcore/option.rs:1188:5
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:77
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:59
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1057
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1426
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:62
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:195
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:215
  10: rustc_driver::report_ice
  11: <alloc::boxed::Box<F> as core::ops::function::Fn<A>>::call
             at /rustc/119307a83e12291a3fc126735d6bd0292c443464/src/liballoc/boxed.rs:1029
  12: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::{{closure}}
             at /rustc/119307a83e12291a3fc126735d6bd0292c443464/src/libproc_macro/bridge/client.rs:305
  13: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:476
  14: rust_begin_unwind
             at src/libstd/panicking.rs:376
  15: core::panicking::panic_fmt
             at src/libcore/panicking.rs:84
  16: core::option::expect_failed
             at src/libcore/option.rs:1188
  17: rustc::hir::map::definitions::Definitions::invocation_parent
  18: rustc_resolve::macros::<impl rustc_expand::base::Resolver for rustc_resolve::Resolver>::visit_ast_fragment_with_placeholders
  19: rustc_expand::expand::MacroExpander::collect_invocations
  20: rustc_expand::expand::MacroExpander::fully_expand_fragment
  21: rustc_expand::expand::MacroExpander::expand_crate
  22: rustc_interface::passes::configure_and_expand_inner::{{closure}}
  23: rustc::util::common::time
  24: rustc_interface::passes::configure_and_expand::{{closure}}
  25: rustc_interface::passes::configure_and_expand
  26: rustc_interface::queries::Queries::expansion
  27: rustc_interface::interface::run_compiler_in_existing_thread_pool
  28: scoped_tls::ScopedKey<T>::set
  29: syntax::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

ICE from macro resolving I believe.
https://github.com/rust-lang/rust/blob/e380efa5ecdef714dad72c473fc0933ff4d59283/src/librustc/hir/map/definitions.rs#L511-L513
cc @petrochenkov

csmoe on 1 Jan 2020

cc @petrochenkov

Centril on 2 Jan 2020

triage: P-high, removing nomination tag. (instead, going to proritize going through the P-high issues that have accumulated over last two weeks.)

pnkfelix on 2 Jan 2020

Visiting from triage.. the next step is to reduce the reproducer.

tmandry on 7 Jan 2020

Reduced (playground):

macro_rules! doc_comment {
    ($x: expr, $($tt: tt)*) => {
        #[doc = $x]
        $($tt)*
    };
}

macro_rules! paged_routes {
     ($($rest: tt)* ) => {
         doc_comment! {
            concat!("", ""), 
            async fn name() {} 
        } 
        paged_routes! {
            $($rest)* 
        } 
    }; 
    () => {} 
}
impl Mastodon {
    paged_routes! {
    }
}

lqd on 7 Jan 2020

❤4

Further reduced:

macro_rules! with_doc {
    ($doc: expr) => {
        #[doc = $doc]
        async fn f() {} 
    };
}

with_doc!(concat!(""));

petrochenkov on 14 Mar 2020

❤2

Fixed in https://github.com/rust-lang/rust/pull/70011.

petrochenkov on 14 Mar 2020

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