Failure when running with a valid Cargo.toml that uses dotted key syntax

[Veetaha]

Reproduction steps

Create a workspace manifest Cargo.toml like this:

[workspace]
members = ["my-proc-macro"]
resolver = "2"

[workspace.package]
edition = "2021"

[profile.dev]
package.regex.opt-level = "z"

[profile.dev.package.serde_json]
opt-level = "1"
codegen-units = 1

Notice that having both [profile.dev] and [profile.dev.package.serde_json] headers is important, as well as the dotted key syntax under [profile.dev]. This is the core pattern that breaks trybuild.

Create a proc-macro crate under my-proc-macro directory with my-proc-macro/Cargo.toml:

[package]
edition = { workspace = true }
name    = "my-proc-macro"
version = "0.1.0"

[lib]
proc-macro = true

[dev-dependencies]
trybuild = "1.0"

Setup trybuild as usual in the integration tests

Boilerplate setup (collapsed)

my-proc-macro/tests/main.rs

#[test]
fn trybuild() {
    trybuild::TestCases::new().compile_fail("tests/compile_fail/*.rs");
}

my-proc-macro/tests/compile_fail/test1.rs

fn main() {
    bruh
}

Actual

Trybuild panics with the following output:

cargo test --test '*' -p my-proc-macro
    Finished test [unoptimized + debuginfo] target(s) in 0.03s
     Running tests/main.rs (target/debug/deps/main-350bbdab8af3fc79)

running 1 test
ERROR: Cargo.toml uses edition.workspace=true, but no edition found in workspace's manifest

test trybuild ... FAILED

failures:

---- trybuild stdout ----
thread 'trybuild' panicked at /home/veetaha/.cargo/registry/src/index.crates.io-6f17d22bba15001f/trybuild-1.0.89/src/run.rs:61:13:
tests failed
stack backtrace:
   0:     0x55ee4ab9709c - std::backtrace_rs::backtrace::libunwind::trace::ha637c64ce894333a
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x55ee4ab9709c - std::backtrace_rs::backtrace::trace_unsynchronized::h47f62dea28e0c88d
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x55ee4ab9709c - std::sys_common::backtrace::_print_fmt::h9eef0abe20ede486
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x55ee4ab9709c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hed7f999df88cc644
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x55ee4abc4d00 - core::fmt::rt::Argument::fmt::h1539a9308b8d058d
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/fmt/rt.rs:142:9
   5:     0x55ee4abc4d00 - core::fmt::write::h3a39390d8560d9c9
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/fmt/mod.rs:1120:17
   6:     0x55ee4ab9385f - std::io::Write::write_fmt::h040b369f3a0f9cbc
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/io/mod.rs:1762:15
   7:     0x55ee4ab96e84 - std::sys_common::backtrace::_print::h894006fb5c6f3d45
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x55ee4ab96e84 - std::sys_common::backtrace::print::h23a2d212c6fff936
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x55ee4ab98b47 - std::panicking::default_hook::{{closure}}::h8a1d2ee00185001a
  10:     0x55ee4ab98833 - std::panicking::default_hook::h6038f2eba384e475
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:289:9
  11:     0x55ee4ab65b57 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0ad024c9bdc6d768
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2021:9
  12:     0x55ee4ab65b57 - test::test_main::{{closure}}::h7500b54257359db6
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:138:21
  13:     0x55ee4ab991c8 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h1f8f335eaa9cfaee
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2021:9
  14:     0x55ee4ab991c8 - std::panicking::rust_panic_with_hook::h2b5517d590cab22e
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:783:13
  15:     0x55ee4ab98ee9 - std::panicking::begin_panic_handler::{{closure}}::h233112c06e0ef43e
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:649:13
  16:     0x55ee4ab97566 - std::sys_common::backtrace::__rust_end_short_backtrace::h6e893f24d7ebbff8
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:170:18
  17:     0x55ee4ab98c82 - rust_begin_unwind
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:645:5
  18:     0x55ee4abc3085 - core::panicking::panic_fmt::hbf0e066aabfa482c
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panicking.rs:72:14
  19:     0x55ee4aa9d9c4 - trybuild::run::<impl trybuild::Runner>::run::{{closure}}::hd83d3e91013f8a64
                               at /home/veetaha/.cargo/registry/src/index.crates.io-6f17d22bba15001f/trybuild-1.0.89/src/run.rs:61:13
  20:     0x55ee4aa76579 - core::result::Result<T,E>::unwrap_or_else::hdda898d1b93120b9
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/result.rs:1430:23
  21:     0x55ee4aa7fadf - trybuild::run::<impl trybuild::Runner>::run::hcbea432d9573d6ae
                               at /home/veetaha/.cargo/registry/src/index.crates.io-6f17d22bba15001f/trybuild-1.0.89/src/run.rs:53:32
  22:     0x55ee4aa85c38 - <trybuild::TestCases as core::ops::drop::Drop>::drop::hd16a24684553c363
                               at /home/veetaha/.cargo/registry/src/index.crates.io-6f17d22bba15001f/trybuild-1.0.89/src/lib.rs:317:13
  23:     0x55ee4a952b37 - core::ptr::drop_in_place<trybuild::TestCases>::h45ce8b3d84ff243a
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ptr/mod.rs:498:1
  24:     0x55ee4a952803 - main::trybuild::h27a64ead6c3891db
                               at /home/veetaha/sandbox/rust/crates/my-proc-macro/tests/main.rs:4:71
  25:     0x55ee4a952a47 - main::trybuild::{{closure}}::h44ba9f447382c23b
                               at /home/veetaha/sandbox/rust/crates/my-proc-macro/tests/main.rs:3:14
  26:     0x55ee4a952ae6 - core::ops::function::FnOnce::call_once::h80bee375ca993ab6
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:250:5
  27:     0x55ee4ab6b1af - core::ops::function::FnOnce::call_once::h2b5d431d5046312d
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:250:5
  28:     0x55ee4ab6b1af - test::__rust_begin_short_backtrace::h7714669af176e207
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:628:18
  29:     0x55ee4ab6a1c5 - test::run_test_in_process::{{closure}}::h85218797dcbcec12
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:651:60
  30:     0x55ee4ab6a1c5 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h76c106ea31c14d7b
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panic/unwind_safe.rs:272:9
  31:     0x55ee4ab6a1c5 - std::panicking::try::do_call::h3bd5d0f6620ee946
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:552:40
  32:     0x55ee4ab6a1c5 - std::panicking::try::h232e535e4744fe31
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:516:19
  33:     0x55ee4ab6a1c5 - std::panic::catch_unwind::h3ce3bd6ca8dbac68
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panic.rs:142:14
  34:     0x55ee4ab6a1c5 - test::run_test_in_process::hc97b257c9621286a
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:651:27
  35:     0x55ee4ab6a1c5 - test::run_test::{{closure}}::h2aa798823a438d38
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:574:43
  36:     0x55ee4ab2fff6 - test::run_test::{{closure}}::h87d231c78fb59832
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:602:41
  37:     0x55ee4ab2fff6 - std::sys_common::backtrace::__rust_begin_short_backtrace::he6df152596625789
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:154:18
  38:     0x55ee4ab350a7 - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::ha94be15d1e0acf36
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/mod.rs:529:17
  39:     0x55ee4ab350a7 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h9dc6bd6372f16606
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panic/unwind_safe.rs:272:9
  40:     0x55ee4ab350a7 - std::panicking::try::do_call::h9057517f80303cd4
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:552:40
  41:     0x55ee4ab350a7 - std::panicking::try::he3a30b11ee45340c
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:516:19
  42:     0x55ee4ab350a7 - std::panic::catch_unwind::h410458cfd3528b8b
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panic.rs:142:14
  43:     0x55ee4ab350a7 - std::thread::Builder::spawn_unchecked_::{{closure}}::h72ac3bdb567b737b
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/mod.rs:528:30
  44:     0x55ee4ab350a7 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h38f34da3654a8344
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:250:5
  45:     0x55ee4ab9edf5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc7eafaff61e32df9
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2007:9
  46:     0x55ee4ab9edf5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6ba4a5de48dd2304
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2007:9
  47:     0x55ee4ab9edf5 - std::sys::unix::thread::Thread::new::thread_start::he469335aef763e45
                               at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys/unix/thread.rs:108:17
  48:     0x7f211f48bac3 - start_thread
                               at ./nptl/pthread_create.c:442:8
  49:     0x7f211f51d850 - __GI___clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  50:                0x0 - <unknown>


failures:
    trybuild

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.10s

error: test failed, to rerun pass `-p my-proc-macro --test main`

Expected

Trybuild should not fail and tests should pass.

Footnotes

I assume trybuild's basic-toml dependency fails at parsing the file, or rather parses it incorrectly, because there is no parsing error thrown here.

Maybe if I could switch trybuild to use toml crate instead, that would fix this, especially because I already have it in my dependencies. Maybe via a cargo feature flag or smth?

[dtolnay]

Fixed in trybuild 1.0.90. Thanks for the helpful minimal repro.