compiler panic when typechecking a specific erroneous function

[z-erica]

Code

src/main.rs:

use nix::NixPath;

fn one<P: NixPath>(_: &P) {}

fn two() {
    drop(missing);
}

fn three(a: String) {
    one(a.as_ref());
}

Cargo.toml (yes, i need both dependencies to reproduce):

[package]
name = "doasd"
version = "0.1.0"
edition = "2021"

[dependencies]
libsystemd = "0.7.0"
nix = "0.29.0"

Cargo.lock:

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4

[[package]]
name = "autocfg"
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"

[[package]]
name = "bitflags"
version = "2.8.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8f68f53c83ab957f72c32642f3868eec03eb974d1fb82e453128456482613d36"

[[package]]
name = "block-buffer"
version = "0.10.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
dependencies = [
 "generic-array",
]

[[package]]
name = "cfg-if"
version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"

[[package]]
name = "cfg_aliases"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"

[[package]]
name = "cpufeatures"
version = "0.2.17"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "59ed5838eebb26a2bb2e58f6d5b5316989ae9d08bab10e0e6d103e656d1b0280"
dependencies = [
 "libc",
]

[[package]]
name = "crypto-common"
version = "0.1.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
dependencies = [
 "generic-array",
 "typenum",
]

[[package]]
name = "digest"
version = "0.10.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
dependencies = [
 "block-buffer",
 "crypto-common",
 "subtle",
]

[[package]]
name = "doasd"
version = "0.1.0"
dependencies = [
 "libsystemd",
 "nix 0.29.0",
]

[[package]]
name = "generic-array"
version = "0.14.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
dependencies = [
 "typenum",
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]

[[package]]
name = "hmac"
version = "0.12.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
dependencies = [
 "digest",
]

[[package]]
name = "libc"
version = "0.2.169"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b5aba8db14291edd000dfcc4d620c7ebfb122c613afb886ca8803fa4e128a20a"

[[package]]
name = "libsystemd"
version = "0.7.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c592dc396b464005f78a5853555b9f240bc5378bf5221acc4e129910b2678869"
dependencies = [
 "hmac",
 "libc",
 "log",
 "nix 0.27.1",
 "nom",
 "once_cell",
 "serde",
 "sha2",
 "thiserror",
 "uuid",
]

[[package]]
name = "log"
version = "0.4.25"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "04cbf5b083de1c7e0222a7a51dbfdba1cbe1c6ab0b15e29fff3f6c077fd9cd9f"

[[package]]
name = "memchr"
version = "2.7.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"

[[package]]
name = "memoffset"
version = "0.9.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "488016bfae457b036d996092f6cb448677611ce4449e970ceaf42695203f218a"
dependencies = [
 "autocfg",
]

[[package]]
name = "minimal-lexical"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"

[[package]]
name = "nix"
version = "0.27.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2eb04e9c688eff1c89d72b407f168cf79bb9e867a9d3323ed6c01519eb9cc053"
dependencies = [
 "bitflags",
 "cfg-if",
 "libc",
 "memoffset",
]

[[package]]
name = "nix"
version = "0.29.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "71e2746dc3a24dd78b3cfcb7be93368c6de9963d30f43a6a73998a9cf4b17b46"
dependencies = [
 "bitflags",
 "cfg-if",
 "cfg_aliases",
 "libc",
]

[[package]]
name = "nom"
version = "7.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
dependencies = [
 "memchr",
 "minimal-lexical",
]

[[package]]
name = "once_cell"
version = "1.20.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "945462a4b81e43c4e3ba96bd7b49d834c6f61198356aa858733bc4acf3cbe62e"

[[package]]
name = "proc-macro2"
version = "1.0.93"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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]

[[package]]
name = "quote"
version = "1.0.38"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0e4dccaaaf89514f546c693ddc140f729f958c247918a13380cccc6078391acc"
dependencies = [
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[[package]]
name = "serde"
version = "1.0.217"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "02fc4265df13d6fa1d00ecff087228cc0a2b5f3c0e87e258d8b94a156e984c70"
dependencies = [
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]

[[package]]
name = "serde_derive"
version = "1.0.217"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5a9bf7cf98d04a2b28aead066b7496853d4779c9cc183c440dbac457641e19a0"
dependencies = [
 "proc-macro2",
 "quote",
 "syn",
]

[[package]]
name = "sha2"
version = "0.10.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
dependencies = [
 "cfg-if",
 "cpufeatures",
 "digest",
]

[[package]]
name = "subtle"
version = "2.6.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"

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name = "syn"
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dependencies = [
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dependencies = [
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 "syn",
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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[[package]]
name = "version_check"
version = "0.9.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"

Meta

rustc --version --verbose:

rustc 1.84.0 (9fc6b4312 2025-01-07) (Chimera Linux)
binary: rustc
commit-hash: 9fc6b43126469e3858e2fe86cafb4f0fd5068869
commit-date: 2025-01-07
host: x86_64-chimera-linux-musl
release: 1.84.0
LLVM version: 19.1.7

Error output

   Compiling doasd v0.1.0 (/home/me/proj/doasd)
error[E0425]: cannot find value `missing` in this scope
 --> src/main.rs:6:10
  |
6 |     drop(missing);
  |          ^^^^^^^ not found in this scope

error[E0601]: `main` function not found in crate `doasd`
  --> src/main.rs:11:2
   |
11 | }
   |  ^ consider adding a `main` function to `src/main.rs`

thread 'rustc' panicked at compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs:1824:44:
called `Option::unwrap()` on a `None` value
stack backtrace:

[backtrace snipped]

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.84.0 (9fc6b4312 2025-01-07) (Chimera Linux) running on x86_64-chimera-linux-musl

note: compiler flags: --crate-type bin -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

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

query stack during panic:
#0 [typeck] type-checking `three`
#1 [analysis] running analysis passes on this crate
end of query stack
Some errors have detailed explanations: E0425, E0601.
For more information about an error, try `rustc --explain E0425`.
error: could not compile `doasd` (bin "doasd") due to 2 previous errors

Backtrace

see stack_backtrace.txt

[jieyouxu]

@z-erica can you try 1.84.1? I think this might be a duplicate of #135410.

[z-erica]

indeed upgrading to 1.84.1 fixes it! i didn't realize my distro's packaging was out of date....