error: internal compiler error: src/librustc_metadata/decoder.rs:483: entry: id not found: DefIndex(86) in crate aljabar with number 15

[GalOz666]

Hey everybody :) I was trying to test matrix*vector in aljabar crate by
running "cargo test" on:

extern crate aljabar;
use aljabar::{matrix, vector};



#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn identity() {
        let pixel = vector![0,255,255,15];
        let kernel = matrix![
        [0,0,0],
        [0,1,0],
        [0,0,0]];
        assert_eq!(pixel*kernel, pixel);
    }
}

and got this:

error: internal compiler error: src/librustc_metadata/decoder.rs:483: entry: id not found: DefIndex(86) in crate aljabar with number 15

thread 'rustc' panicked at 'Box', src/librustc_errors/lib.rs:644:9
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace.
error: aborting due to previous error

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 1.38.0-nightly (60960a2 2019-08-12) running on x86_64-apple-darwin

note: compiler flags: -C debuginfo=2 -C incremental

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

error: Could not compile KernelFiltering.

Not sure if it's a known issue or not but if there's anything else you need from me please let me know :)

[GalOz666]

version:

rustc 1.38.0-nightly (60960a2 2019-08-12)
binary: rustc
commit-hash: 60960a2
commit-date: 2019-08-12
host: x86_64-apple-darwin
release: 1.38.0-nightly
LLVM version: 9.0

[GalOz666]

verbose trace:

error: internal compiler error: src/librustc_metadata/decoder.rs:483: entry: id not found: DefIndex(86) in crate aljabar with number 15

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:644:9
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query stack during panic:
#0 [type_of] processing `aljabar::Vector3::{{constant}}#0`
#1 [evaluate_obligation] evaluating trait selection obligation `aljabar::Vector<^1_0, 4usize>: std::ops::Mul<^1_1>`
#2 [typeck_tables_of] processing `tests::identity`
#3 [typeck_item_bodies] type-checking all item bodies
#4 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error

[Centril]

if there's anything else you need from me please let me know :)

It would help if you can reduce the problem to a minimal reproducer without the crate.

(Also note that ICEs are common for const_generics.)

[GalOz666]

Not sure if i can manage that. Could be over my head.

[est31]

@Centril there is a minimal example here: #44580 (comment)