Nightly is outdated

[RalfJung]

"Nightly" on https://play.rust-lang.org/ currently is from 2019-12-29, so a few days outdated. Looks like something is going wrong with the nightly updates.

(Also it seems impossible to copy-paste the version number from playground, which makes reporting such bugs more annoying that it would have to be...)

[RalfJung]

From the CI logs, this looks like a build failure in matrixmultiply-0.2.3:

error: array lengths can't depend on generic parameters
   --> /root/.cargo/registry/src/github.1485827954.workers.dev-1ecc6299db9ec823/matrixmultiply-0.2.3/src/sgemm_kernel.rs:223:40
    |
223 |     let mut ab = [_mm256_setzero_ps(); MR];
    |                                        ^^

Cc bluss/matrixmultiply#50

[shepmaster]

Also it seems impossible to copy-paste the version number from playground,

That’s a web browser limitation, as the text is inside a button. You’ll see I’ve added CSS to enable this but it only works in Chrome, IIRC.

[shepmaster]

Actually I might not have added that CSS. I’ll see if I can easily.

[shepmaster]

And the direct upstream issue is rust-lang/rust#67743

[RalfJung]

rustc is fixed, and nightly is updating again :)