ICE: `only local crates should have sources emitted`

[oold]

rustc-ice-2025-07-31T21_03_32-3325.txt

Code

https://github.com/oold/daemonize/tree/ec717e7b6254d4acabecf8bb37e924b068e18d88

Meta

rustc --version --verbose:

rustc 1.90.0-nightly (3048886e5 2025-07-30)
binary: rustc
commit-hash: 3048886e59c94470e726ecaaf2add7242510ac11
commit-date: 2025-07-30
host: x86_64-unknown-linux-gnu
release: 1.90.0-nightly
LLVM version: 20.1.8

Error output

thread 'rustc' panicked at src/librustdoc/html/sources.rs:346:14:
only local crates should have sources emitted

Backtrace

stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::option::expect_failed
   3: <&core::fmt::builders::FromFn<rustdoc::html::sources::print_src<&mut core::fmt::Formatter>::{closure#0}> as core::fmt::Display>::fmt
   4: core::fmt::write
   5: <&askama::filters::escape::Safe<&core::fmt::builders::FromFn<rustdoc::html::sources::print_src<&mut core::fmt::Formatter>::{closure#0}>> as core::fmt::Display>::fmt
   6: core::fmt::write
   7: rustdoc::html::render::render_call_locations::<&mut core::fmt::Formatter>::{closure#2}
   8: <core::fmt::builders::FromFn<rustdoc::html::render::document_full_inner::{closure#0}> as core::fmt::Display>::fmt
   9: core::fmt::write
  10: rustdoc::html::render::render_impl::{closure#0}::doc_impl_item::<&mut alloc::string::String, &mut alloc::string::String>
  11: <core::fmt::builders::FromFn<rustdoc::html::render::render_impl::{closure#0}> as core::fmt::Display>::fmt
  12: core::fmt::write
  13: rustdoc::html::render::render_assoc_items_inner
  14: <core::fmt::builders::FromFn<rustdoc::html::render::render_assoc_items::{closure#0}> as core::fmt::Display>::fmt
  15: core::fmt::write
  16: <rustdoc::html::render::print_item::DisplayStruct>::render_into::<core::fmt::Formatter>
  17: <core::fmt::builders::FromFn<rustdoc::html::render::print_item::item_struct::{closure#0}> as core::fmt::Display>::fmt
  18: core::fmt::write
  19: <rustdoc::html::render::context::Context>::render_item
  20: <rustdoc::html::render::context::Context as rustdoc::formats::renderer::FormatRenderer>::item
  21: rustdoc::formats::renderer::run_format_inner::<rustdoc::html::render::context::Context>
  22: rustdoc::formats::renderer::run_format_inner::<rustdoc::html::render::context::Context>
  23: rustc_interface::passes::create_and_enter_global_ctxt::<(), rustdoc::main_args::{closure#2}::{closure#0}>::{closure#2}::{closure#0}
  24: rustc_interface::interface::run_compiler::<(), rustdoc::main_args::{closure#2}>::{closure#1}

[GuillaumeGomez]

Taking a look tomorrow.

[GuillaumeGomez]

I generated the docs with:

rustc 1.90.0-nightly (5adb489a8 2025-07-05)
binary: rustc
commit-hash: 5adb489a8034f7b56b29f3b28af0813c866f679c
commit-date: 2025-07-05
host: x86_64-unknown-linux-gnu
release: 1.90.0-nightly
LLVM version: 20.1.7

and with the latest master branch commit:

Merge: ec7c0261252 e6c0e63bd59
Author: bors <bors@rust-lang.org>
Date:   Wed Aug 6 04:36:54 2025 +0000

And I can't reproduce the failure. Did you build with specific cfg?

[oold]

I'm building my docs with: cargo +nightly doc -p daemonize2 --verbose -Z rustdoc-scrape-examples

The failure still occurs in my GitHub workflow.

[GuillaumeGomez]

Ah bingo, problem comes from rustdoc-scrape-examples. Thanks for the clarification!

[GuillaumeGomez]

And this is the PR that introduced this regression: #144600. Investigation++

[GuillaumeGomez]

Minimized code reproducing the error:

Cargo.toml

[package]
name = "foo"
version = "0.0.1"
edition = "2024"

[[example]]
name = "complex"
doc-scrape-examples = true

src/lib.rs

pub struct X;

impl X {
    pub fn new() -> Self {
        X
    }
}

examples/complex.rs

fn main() {
    let mut x = foo::X::new();
}

And you also need to create an example examples/tester.rs (yes it's important).

Then just run cargo doc -Z rustdoc-scrape-examples and the bug occurs.