rust compiler bug report

[GuillaumeGomez]

Hey, here's the compiler error :

rustc --out-dir=lib src/rgsl.rs
src/types/rng.rs:76:39: 76:101 error: function calls in constants are limited to struct and enum constructors [E0015]
src/types/rng.rs:76 pub static DefaultRngType : RngType = ffi::FFI::wrap(ffi::gsl_rng_default as *mut ffi::gsl_rng_type);
                                                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/types/rng.rs:76:39: 76:53 error: paths in constants may only refer to constants or functions [E0014]
src/types/rng.rs:76 pub static DefaultRngType : RngType = ffi::FFI::wrap(ffi::gsl_rng_default as *mut ffi::gsl_rng_type);
                                                          ^~~~~~~~~~~~~~
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at 'expected item, found foreign item ffi::gsl_rng_default::gsl_rng_default (id=77)', /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/libsyntax/ast_map/mod.rs:278

stack backtrace:
   1:     0x2b06fdd678d0 - rt::backtrace::imp::write::hd12ae02842755623o1q
   2:     0x2b06fdd6a970 - failure::on_fail::h6afb6f0ebb5c1bdeBmr
   3:     0x2b06fd5f4bb0 - unwind::begin_unwind_inner::h86392b0c3fc310f0M8d
   4:     0x2b06fd5f48a0 - unwind::begin_unwind_fmt::hd35db468d804f365h6d
   5:     0x2b06feb04f80 - ast_map::Map::expect_item::h4597d80f1ef5aa9cILy
   6:     0x2b06fc46c270 - middle::check_const::CheckItemRecursionVisitor<'a>.Visitor<(*>::visit_expr::h2e9f3d299534964bjPl
   7:     0x2b06fc46c270 - middle::check_const::CheckItemRecursionVisitor<'a>.Visitor<(*>::visit_expr::h2e9f3d299534964bjPl
   8:     0x2b06fc46c270 - middle::check_const::CheckItemRecursionVisitor<'a>.Visitor<(*>::visit_expr::h2e9f3d299534964bjPl
   9:     0x2b06fc46af70 - middle::check_const::CheckItemRecursionVisitor<'a>.Visitor<(*>::visit_item::h8a613a9edea4e565oOl
  10:     0x2b06fc466090 - middle::check_const::check_item::h267c6ba5219e9e33Yul
  11:     0x2b06fc466090 - middle::check_const::check_item::h267c6ba5219e9e33Yul
  12:     0x2b06fc466090 - middle::check_const::check_item::h267c6ba5219e9e33Yul
  13:     0x2b06fc469490 - middle::check_const::check_crate::h65bbcf0bb3bc1b23zul
  14:     0x2b06fc21e400 - util::common::time::h7327768964783328304
  15:     0x2b06fcadb690 - driver::driver::phase_3_run_analysis_passes::hb464148d666a3b1afJw
  16:     0x2b06fcad67d0 - driver::driver::compile_input::h638ffee922a36ddauvw
  17:     0x2b06fcb80820 - driver::run_compiler::h5ecca9beeafb5864JZz
  18:     0x2b06fcb80730 - driver::main_args::closure.136214
  19:     0x2b06fcb93080 - task::TaskBuilder<S>::try_future::closure.137375
  20:     0x2b06fcb92e80 - task::TaskBuilder<S>::spawn_internal::closure.137352
  21:     0x2b06fbf2da20 - task::spawn_opts::closure.8315
  22:     0x2b06fd64c750 - rust_try_inner
  23:     0x2b06fd64c740 - rust_try
  24:     0x2b06fd5f2210 - unwind::try::ha10f578e4c63e61ehXd
  25:     0x2b06fd5f1fb0 - task::Task::run::hddad80091d517d7cT4c
  26:     0x2b06fbf2d7e0 - task::spawn_opts::closure.8261
  27:     0x2b06fd5f3df0 - thread::thread_start::h182a6a945c32d2093sd
  28:     0x2b06fe3f10c0 - start_thread
  29:     0x2b06fda0c359 - __clone
  30:                0x0 - <unknown>

make: *** [rgsl] Error 101

[GuillaumeGomez]

I almost forgot :

> rustc --version
rustc 0.12.0-pre-nightly (6b5ec40d4 2014-08-15 00:46:19 +0000)

[steveklabnik]

Can you share the code with us, or something to reproduce it?

[GuillaumeGomez]

For example you can add this line :

pub static DefaultRngType : RngType = ffi::FFI::wrap(ffi::gsl_rng_default as *mut ffi::gsl_rng_type);

In this file : https://github.com/GuillaumeGomez/rust-GSL/blob/master/src/types/rng.rs

The bug will occur again.

[ghost]

Minimal test case:

mod Y {
    type X = uint;
    extern {
        static x: *const uint;
    }
    fn foo(value: *const X) -> *const X {
        value
    }
}

static foo: *const Y::X = Y::foo(Y::x as *const Y::X);

fn main() {}

[sanxiyn]

This seems fixed by #18279.

[GuillaumeGomez]

@sanxiyn: I confirm. Thanks for the info !