Procedural macro error

[gsquire]

While trying to test out a simple function for the reqwest module, I found an odd error when trying to derive serde's Deserialize trait on a custom type.

Sample code (please see comment below on how to run):

#![feature(proc_macro)]
extern crate reqwest;

#[macro_use]
extern crate serde_derive;

#[derive(Debug, Deserialize)]
struct Something {
    Origin: String,
}

fn main() {
    let mut res = reqwest::get("https://httpbin.org/ip").unwrap();

    println!("JSON: {:?}", res.json::<Something>());
}

Meta:

rustc 1.15.0-nightly (0ed951993 2016-11-14)
binary: rustc
commit-hash: 0ed951993fb5721a303ca5fa743543dd9f3f6b10
commit-date: 2016-11-14
host: x86_64-apple-darwin
release: 1.15.0-nightly
LLVM version: 3.9

Backtrace:

thread 'rustc' panicked at 'Box<Any>', ../src/librustc_errors/lib.rs:424
stack backtrace:
   1:        0x10d3534ea - std::sys::imp::backtrace::tracing::imp::write::h944c02ac40aee2d7
   2:        0x10d36077f - std::panicking::default_hook::{{closure}}::h6875a2976258b020
   3:        0x10d36032d - std::panicking::default_hook::h88ffbc5922643264
   4:        0x10d360c46 - std::panicking::rust_panic_with_hook::ha5aed1dfc0e220e3
   5:        0x10aaddf2a - std::panicking::begin_panic::h264cdc75d51b518b
   6:        0x10aaeed34 - rustc_errors::Handler::bug::h620f7270292f0095
   7:        0x109e54ecc - rustc::session::opt_span_bug_fmt::{{closure}}::h4a9b70c3df8b4b3a
   8:        0x109e54cd9 - rustc::session::opt_span_bug_fmt::h7d83586c6e2c7ae6
   9:        0x109e5485a - rustc::session::bug_fmt::he2d2f00a4afa9d1e
  10:        0x109389b73 - rustc_metadata::decoder::<impl rustc_metadata::cstore::CrateMetadata>::entry::h5e3d8114267e9116
  11:        0x1093924ab - rustc_metadata::cstore_impl::<impl rustc::middle::cstore::CrateStore<'tcx> for rustc_metadata::cstore::CStore>::visibility::h2949b511f18961ee
  12:        0x10939af66 - rustc_metadata::cstore_impl::<impl rustc::middle::cstore::CrateStore<'tcx> for rustc_metadata::cstore::CStore>::visible_parent_map::hab53861eb74bce8d
  13:        0x109e9e1c4 - rustc::ty::item_path::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::push_item_path::haa7f7a9afda5f72a
  14:        0x109eea2d5 - rustc::util::ppaux::parameterized::h7bcfb1fd3d8a947a
  15:        0x10d3a4cb5 - core::fmt::write::h01739b8f12f355f9
  16:        0x109e86c4c - rustc::traits::specialize::specialization_graph::Graph::insert::h62250bf0632d4218
  17:        0x109ebad12 - rustc::ty::trait_def::TraitDef::add_impl_for_specialization::h39896639aba068c7
  18:        0x109183b67 - <rustc_typeck::coherence::overlap::OverlapChecker<'cx, 'tcx> as rustc::hir::intravisit::Visitor<'v>>::visit_item::h5ba64bfdace3da91
  19:        0x10918caab - rustc_typeck::coherence::check_coherence::h7b433ad2f4520d1a
  20:        0x1091936a1 - rustc_typeck::check_crate::h4045752b69a796e8
  21:        0x108c301ac - rustc_driver::driver::phase_3_run_analysis_passes::{{closure}}::h97a3a12d948df547
  22:        0x108c2d37d - rustc_driver::driver::phase_3_run_analysis_passes::hb0ad9de18d423e67
  23:        0x108c14bc5 - rustc_driver::driver::compile_input::h8e119234b60571d5
  24:        0x108c5a229 - rustc_driver::run_compiler::hbdfc4f84e2e0f4b9
  25:        0x108b79988 - std::panicking::try::do_call::hf679f17bf3b43b0b
  26:        0x10d3631fa - __rust_maybe_catch_panic
  27:        0x108b9daaf - <F as alloc::boxed::FnBox<A>>::call_box::h506fb5d7b8891cd4
  28:        0x10d35f8d4 - std::sys::imp::thread::Thread::new::thread_start::h8084b1107992ae5b
  29:     0x7fff9185299c - _pthread_body
  30:     0x7fff91852919 - _pthread_start

error: Could not compile `reqwest`.

In order to run the example you will need to apply this patch I have been working on in order to add a helper function for reqwest. It can be found here. The base commit is seanmonstar/reqwest@6967f92

[keeperofdakeys]

This is probably similar to #37788, which should be fixed in the next nightly.

[gsquire]

Hmm, I am still seeing the error with this nightly version:

rustc 1.15.0-nightly (ba872f270 2016-11-17)
binary: rustc
commit-hash: ba872f270781ada15426cfac7db20b30b81777dc
commit-date: 2016-11-17
host: x86_64-apple-darwin
release: 1.15.0-nightly
LLVM version: 3.9

Perhaps the patch is going to be in the upcoming nightly?

[keeperofdakeys]

Running this myself, I get the same error message as the issue I linked.

error: internal compiler error: ../src/librustc_metadata/decoder.rs:490: entry: id not found: DefIndex(1) in crate "serde_derive" with number 44

It also looks like the latest nightly failed, so keep an eye out until the next one is released.

[gsquire]

@keeperofdakeys Thanks for following up. I will close this ticket when things settle with the issue.

[zimurgh]

Hi, I'm having this problem too. Is there a way to track when the next nightly release will be? Or is there a previous nightly version that one can override to in order to temporarily avoid this bug?

[keeperofdakeys]

The latest nightly appears to fix the issue.