Rust 1.44.0.0 Binary Doesn't Exist for 10.12, Causing Full Rust Build from Source

[mascguy (Christopher Nielsen)]

Viewing the available files at ​http://packages.macports.org/rust/, I'm expecting to see a binary for version 1.44.0_0 and macOS 10.12 (Darwin 16), but none exists. Ditto for the various mirrors, so it's not isolated to 'packages.macports.org'.

Binaries 'rust-1.44.0_0.darwin_15.x86_64.tbz2', 'rust-1.44.0_0.darwin_17.x86_64.tbz2', 'rust-1.44.0_0.darwin_18.x86_64.tbz2', and 'rust-1.44.0_0.darwin_19.x86_64.tbz2' all exist (plus their respective checksum files), but a Darwin 16 variant does not. (Though said binary does exist, for earlier Rust versions.)

Based on the various build info I've reviewed, it doesn't appear that the 10.12 compilation failed for 1.44.0_0. Nor could I find any applicable bugs, apart from ​https://trac.macports.org/ticket/60670 - which involves building Rust from source, on macOS Yosemite.

Is something failing in the build or publish, that's preventing the binary from being copied and mirrored? Or is there something else I'm missing?

p.s. The rust source build - which is huge, and takes an eternity - also fails for me, so that's not an acceptable workaround. And would prefer not to have to dive into that, given that the binary should arguably exist.