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build x86_64-unknown-motor failed #160366
Description
rustc 1.99.0-nightly (73dc916 2026-08-01)
target: x86_64-unknown-motor
build with -Zbuild-std
error[: mismatched types
╭▸ /rustc/73dc9167f1cd099e525c9ade2e068d1907b78564/library/std/src/sys/process/motor.rs:149:13
│
149 │ let (handle, stdin, stdout, stderr) =
│ ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ expected `SpawnResult`, found `(_, _, _, _)`
150 │ moto_rt::process::spawn(args).map_err(map_motor_error)?;
│ ─────────────────────────────────────────────────────── this expression has type `SpawnResult`
│
╰ note: expected struct `SpawnResult`
found tuple `(_, _, _, _)`
For more information about this error, try `rustc --explain E0308`.
error: could not compile `std` (lib) due to 1 previous error
Activity
zachs18 commentedon Aug 2, 2026
Regression in de53406. Note that if it is a legacy rollup build, it might be available in rust-lang-ci@de53406.
The PR introducing the regression in this rollup is #160262 : Library lock file maintenance
searched nightlies: from nightly-2026-07-31 to nightly-2026-08-02
regressed nightly: nightly-2026-08-02
searched commit range: ad3d0bc...73dc916
regressed commit: 73dc916
bisected with cargo-bisect-rustc v0.6.11
Host triple: x86_64-unknown-linux-gnu
Reproduce with:
with
fn main() {}insrc/lib.rs#160262 updated moto-rt from
0.16.0to0.16.4. In0.16.0,moto_rt::process::spawnreturnsResult<(u64, RtFd, RtFd, RtFd)>, but in0.16.4it returnsResult<SpawnResult>, whereSpawnResultis a struct.@rustbot label O-motor-os
zachs18 commentedon Aug 2, 2026
cc @lasiotus (
*-unknown-motortarget maintainer)moturus/motor-os@6f1b844#diff-37762e512e788308bca5b31c747fe764f3e8f508275fe89a3e602b98cc050683
Seems like the signature change for
moto_rt::process::spawnshould have been a semver-major change formoto-rt?lasiotus commentedon Aug 2, 2026
Ack. Sorry about that. I've yanked v0.16.4 and will publish v 0.17.0 today.
lasiotus commentedon Aug 2, 2026
The FIX: #160392
lasiotus commentedon Aug 25, 2026
Fixed by PR #160392
joboet commentedon Sep 1, 2026
Indeed, does-it-build shows it passing again.