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sourcefrog opened this issue Jun 13, 2025 · 8 comments
Open

Spurious "expected integer or floating pointer number after - (rust-analyzer macro-error)" (with reproduction) #19993

sourcefrog opened this issue Jun 13, 2025 · 8 comments
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C-bug Category: bug

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@sourcefrog
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rust-analyzer version: rust-analyzer 1.89.0-nightly (573a015 2025-06-12)

rustc version: rustc 1.89.0-nightly (573a01569 2025-06-12)
binary: rustc
commit-hash: 573a01569000d395498a5f98f916d6e5305ac81a
commit-date: 2025-06-12
host: x86_64-unknown-linux-gnu
release: 1.89.0-nightly
LLVM version: 20.1.5

editor or extension: Zed 0.190.5 901b05221cf3f1946638c44a81c93cffdaf1cdf5, also
reproducible on VS Code 1.100.3 258e40fedc6cb8edf399a463ce3a9d32e7e1f6f3

relevant settings: (eg. client settings, or environment variables like CARGO, RUSTC, RUSTUP_HOME or CARGO_HOME)

repository link (if public, optional): (eg. rust-analyzer) https://github.com/sourcefrog/rust-analyzer-repro (minimized from https://github.com/sourcefrog/cargo-mutants)

code snippet to reproduce:

use schemars::JsonSchema;
use serde::Deserialize;

#[derive(Default, Deserialize, JsonSchema)]
pub struct Config {
    /// Pass `--cap-lints` to rustc.
    pub cap_lints: bool,
    /// Skip calls to functions or methods with these names.
    ///
    /// This is combined with values from the --skip-calls argument.
    pub skip_calls: Vec<String>,
    /// Use built-in defaults for `skip_calls` in addition to any explicit values.
    pub skip_calls_defaults: Option<bool>,
}

errors:

; rust-analyzer diagnostics .
processing crate: rust_analyzer_repro, module: /home/mbp/src/rust-analyzer-repro/src/lib.rs
Error Ra("macro-error", Error) from LineCol { line: 5, col: 4 } to LineCol { line: 5, col: 36 }: expected integer or floating pointer number after '-'
Error Ra("macro-error", Error) from LineCol { line: 5, col: 4 } to LineCol { line: 5, col: 36 }: expected integer or floating pointer number after '-'
Error Ra("macro-error", Error) from LineCol { line: 7, col: 4 } to LineCol { line: 9, col: 68 }: expected integer or floating pointer number after '-'
Error Ra("macro-error", Error) from LineCol { line: 7, col: 4 } to LineCol { line: 9, col: 68 }: expected integer or floating pointer number after '-'
Error Ra("macro-error", Error) from LineCol { line: 11, col: 4 } to LineCol { line: 11, col: 82 }: expected integer or floating pointer number after '-'
Error Ra("macro-error", Error) from LineCol { line: 11, col: 4 } to LineCol { line: 11, col: 82 }: expected integer or floating pointer number after '-'

diagnostic scan complete

Error: diagnostic error detected

Stack backtrace:
   0: <anyhow::Error>::msg::<&str>
   1: std::sys::backtrace::__rust_begin_short_backtrace::<<stdx::thread::Builder>::spawn<<rust_analyzer::cli::flags::Diagnostics>::run::{closure#0}, core::result::Result<(), anyhow::Error>>::{closure#0}, core::result::Result<(), anyhow::Error>>
   2: <<std::thread::Builder>::spawn_unchecked_<<stdx::thread::Builder>::spawn<<rust_analyzer::cli::flags::Diagnostics>::run::{closure#0}, core::result::Result<(), anyhow::Error>>::{closure#0}, core::result::Result<(), anyhow::Error>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
   3: std::sys::pal::unix::thread::Thread::new::thread_start
   4: start_thread
             at ./nptl/pthread_create.c:442:8
   5: __GI___clone3
             at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81:0

cargo build doesn't error on this code.

Incidentally there's a typo "floating pointer" rather than "floating point".
@sourcefrog sourcefrog added the C-bug Category: bug label Jun 13, 2025
@sourcefrog
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Specifically the problem seems to come from the combination of

  1. Using the JsonSchema derive macro.
  2. Having a docstring containing the sequence --. (jsonschema extracts the docstrings into metadata, like clap does.)

Since it compiles fine I think it's probably a RA bug.

cargo expand seems to show, as you'd expect, that the -- only goes into a quoted string plus the docstring in the output. So, it's a bit surprising that RA is trying to parse it as Rust code. But maybe it's trying to find references to types etc within docstrings.

The problem still reproduces whether I have backticks or not, i.e.

    /// A docstring with a -- causes a problem.
    /// A docstring with a `--` causes a problem.

@ChayimFriedman2
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Grepping in the r-a codebase the thing that causes that error is concat!().

@Veykril
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Veykril commented Jun 13, 2025

Likely our () wrapping for expression fragments at fault again

@sourcefrog
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I got a backtrace in case that helps:

stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/573a01569000d395498a5f98f916d6e5305ac81a/library/std/src/panicking.rs:697:5
   1: core::panicking::panic_fmt
             at /rustc/573a01569000d395498a5f98f916d6e5305ac81a/library/core/src/panicking.rs:75:14
   2: core::panicking::panic_display
             at /rustc/573a01569000d395498a5f98f916d6e5305ac81a/library/core/src/panicking.rs:268:5
   3: core::panicking::panic_explicit
             at /rustc/573a01569000d395498a5f98f916d6e5305ac81a/library/core/src/panicking.rs:241:5
   4: hir_expand::builtin::fn_macro::concat_expand::panic_cold_explicit
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panic.rs:88:13
   5: hir_expand::builtin::fn_macro::concat_expand
             at ./crates/hir-expand/src/builtin/fn_macro.rs:538:29
   6: hir_expand::builtin::fn_macro::EagerExpander::expand
             at ./crates/hir-expand/src/builtin/fn_macro.rs:95:9
   7: hir_expand::db::macro_expand
             at ./crates/hir-expand/src/db.rs:648:42
   8: hir_expand::db::parse_macro_expansion
             at ./crates/hir-expand/src/db.rs:363:62
   9: <<DB as hir_expand::db::ExpandDatabase>::parse_macro_expansion::parse_macro_expansion_shim::Configuration_ as salsa::function::Configuration>::execute::inner_
             at ./crates/hir-expand/src/db.rs:71:8
  10: <<DB as hir_expand::db::ExpandDatabase>::parse_macro_expansion::parse_macro_expansion_shim::Configuration_ as salsa::function::Configuration>::execute
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-macro-rules-0.22.0/src/setup_tracked_fn.rs:207:21
  11: salsa::function::execute::<impl salsa::function::IngredientImpl<C>>::execute_query
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/execute.rs:271:25
  12: salsa::function::execute::<impl salsa::function::IngredientImpl<C>>::execute
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/execute.rs:44:17
  13: salsa::function::fetch::<impl salsa::function::IngredientImpl<C>>::fetch_cold
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/fetch.rs:200:25
  14: salsa::function::fetch::<impl salsa::function::IngredientImpl<C>>::fetch_cold_with_retry
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/fetch.rs:88:25
  15: salsa::function::fetch::<impl salsa::function::IngredientImpl<C>>::refresh_memo::{{closure}}
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/fetch.rs:47:34
  16: core::option::Option<T>::or_else
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:1609:21
  17: salsa::function::fetch::<impl salsa::function::IngredientImpl<C>>::refresh_memo
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/fetch.rs:47:18
  18: salsa::function::fetch::<impl salsa::function::IngredientImpl<C>>::fetch
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/fetch.rs:18:25
  19: <DB as hir_expand::db::ExpandDatabase>::parse_macro_expansion::parse_macro_expansion_shim::{{closure}}
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-macro-rules-0.22.0/src/setup_tracked_fn.rs:365:60
  20: salsa::attach::Attached::attach
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/attach.rs:89:9
  21: salsa::attach::attach::{{closure}}
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/attach.rs:113:15
  22: std::thread::local::LocalKey<T>::try_with
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:315:12
  23: std::thread::local::LocalKey<T>::with
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:279:20
  24: salsa::attach::attach
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/attach.rs:111:14
  25: <DB as hir_expand::db::ExpandDatabase>::parse_macro_expansion::parse_macro_expansion_shim
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-macro-rules-0.22.0/src/setup_tracked_fn.rs:357:13
  26: <DB as hir_expand::db::ExpandDatabase>::parse_macro_expansion
             at ./crates/hir-expand/src/db.rs:52:1
  27: hir_def::expr_store::expander::Expander::within_limit
             at ./crates/hir-def/src/expr_store/expander.rs:202:22
  28: hir_def::expr_store::expander::Expander::enter_expand
             at ./crates/hir-def/src/expr_store/expander.rs:96:27
  29: hir_def::expr_store::lower::ExprCollector::collect_macro_call
             at ./crates/hir-def/src/expr_store/lower.rs:1965:31
  30: hir_def::expr_store::lower::ExprCollector::maybe_collect_expr
             at ./crates/hir-def/src/expr_store/lower.rs:1437:31
  31: hir_def::expr_store::lower::ExprCollector::maybe_collect_expr::{{closure}}
             at ./crates/hir-def/src/expr_store/lower.rs:1130:61
  32: core::ops::function::impls::<impl core::ops::function::FnMut<A> for &mut F>::call_mut
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:294:21
  33: core::iter::traits::iterator::Iterator::find_map::check::{{closure}}
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:2914:32
  34: core::iter::traits::iterator::Iterator::try_fold
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:2426:21
  35: core::iter::traits::iterator::Iterator::find_map
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:2920:14
  36: <core::iter::adapters::filter_map::FilterMap<I,F> as core::iter::traits::iterator::Iterator>::next
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/iter/adapters/filter_map.rs:64:19
  37: <alloc::vec::Vec<T> as alloc::vec::spec_from_iter_nested::SpecFromIterNested<T,I>>::from_iter
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/vec/spec_from_iter_nested.rs:25:41
  38: <alloc::vec::Vec<T> as alloc::vec::spec_from_iter::SpecFromIter<T,I>>::from_iter
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/vec/spec_from_iter.rs:34:9
  39: <alloc::vec::Vec<T> as core::iter::traits::collect::FromIterator<T>>::from_iter
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/vec/mod.rs:3438:9
  40: core::iter::traits::iterator::Iterator::collect
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:2027:9
  41: alloc::boxed::iter::<impl core::iter::traits::collect::FromIterator<I> for alloc::boxed::Box<[I]>>::from_iter
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/boxed/iter.rs:144:26
  42: core::iter::traits::iterator::Iterator::collect
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:2027:9
  43: hir_def::expr_store::lower::ExprCollector::maybe_collect_expr
             at ./crates/hir-def/src/expr_store/lower.rs:1130:84
  44: hir_def::expr_store::lower::ExprCollector::collect_expr
             at ./crates/hir-def/src/expr_store/lower.rs:1023:14
  45: hir_def::expr_store::lower::ExprCollector::collect_expr_opt
             at ./crates/hir-def/src/expr_store/lower.rs:2021:32
  46: hir_def::expr_store::lower::ExprCollector::collect::{{closure}}
             at ./crates/hir-def/src/expr_store/lower.rs:932:22
  47: hir_def::expr_store::lower::ExprCollector::with_label_rib
             at ./crates/hir-def/src/expr_store/lower.rs:2636:19
  48: hir_def::expr_store::lower::ExprCollector::collect
             at ./crates/hir-def/src/expr_store/lower.rs:918:14
  49: hir_def::expr_store::lower::lower_body
             at ./crates/hir-def/src/expr_store/lower.rs:160:31
  50: hir_def::expr_store::body::Body::body_with_source_map_query
             at ./crates/hir-def/src/expr_store/body.rs:106:13
  51: <<DB as hir_def::db::DefDatabase>::body_with_source_map::body_with_source_map_shim::Configuration_ as salsa::function::Configuration>::execute::inner_
             at ./crates/hir-def/src/db.rs:274:21
  52: <<DB as hir_def::db::DefDatabase>::body_with_source_map::body_with_source_map_shim::Configuration_ as salsa::function::Configuration>::execute
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-macro-rules-0.22.0/src/setup_tracked_fn.rs:207:21
  53: salsa::function::execute::<impl salsa::function::IngredientImpl<C>>::execute_query
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/execute.rs:271:25
  54: salsa::function::execute::<impl salsa::function::IngredientImpl<C>>::execute
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/execute.rs:44:17
  55: salsa::function::fetch::<impl salsa::function::IngredientImpl<C>>::fetch_cold
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/fetch.rs:200:25
  56: salsa::function::fetch::<impl salsa::function::IngredientImpl<C>>::fetch_cold_with_retry
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/fetch.rs:88:25
  57: salsa::function::fetch::<impl salsa::function::IngredientImpl<C>>::refresh_memo::{{closure}}
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/fetch.rs:47:34
  58: core::option::Option<T>::or_else
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:1609:21
  59: salsa::function::fetch::<impl salsa::function::IngredientImpl<C>>::refresh_memo
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/fetch.rs:47:18
  60: salsa::function::fetch::<impl salsa::function::IngredientImpl<C>>::fetch
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/function/fetch.rs:18:25
  61: <DB as hir_def::db::DefDatabase>::body_with_source_map::body_with_source_map_shim::{{closure}}
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-macro-rules-0.22.0/src/setup_tracked_fn.rs:365:60
  62: salsa::attach::Attached::attach
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/attach.rs:89:9
  63: salsa::attach::attach::{{closure}}
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/attach.rs:113:15
  64: std::thread::local::LocalKey<T>::try_with
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:315:12
  65: std::thread::local::LocalKey<T>::with
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:279:20
  66: salsa::attach::attach
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/attach.rs:111:14
  67: <DB as hir_def::db::DefDatabase>::body_with_source_map::body_with_source_map_shim
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-macro-rules-0.22.0/src/setup_tracked_fn.rs:357:13
  68: <DB as hir_def::db::DefDatabase>::body_with_source_map
             at ./crates/hir-def/src/db.rs:104:1
  69: hir::DefWithBody::diagnostics
             at ./crates/hir/src/lib.rs:1885:37
  70: hir::ModuleDef::diagnostics
             at ./crates/hir/src/lib.rs:425:21
  71: hir::Module::diagnostics
             at ./crates/hir/src/lib.rs:735:37
  72: hir::DefWithBody::diagnostics
             at ./crates/hir/src/lib.rs:1897:60
  73: hir::AssocItem::diagnostics
             at ./crates/hir/src/lib.rs:3512:41
  74: hir::Module::diagnostics
             at ./crates/hir/src/lib.rs:916:39
  75: hir::DefWithBody::diagnostics
             at ./crates/hir/src/lib.rs:1897:60
  76: hir::ModuleDef::diagnostics
             at ./crates/hir/src/lib.rs:425:21
  77: hir::Module::diagnostics
             at ./crates/hir/src/lib.rs:735:37
  78: ide_diagnostics::semantic_diagnostics
             at ./crates/ide-diagnostics/src/lib.rs:400:19
  79: ide_diagnostics::full_diagnostics
             at ./crates/ide-diagnostics/src/lib.rs:541:16
  80: ide::Analysis::full_diagnostics::{{closure}}
             at ./crates/ide/src/lib.rs:739:27
  81: ide::Analysis::with_db::{{closure}}
             at ./crates/ide/src/lib.rs:867:29
  82: std::panicking::catch_unwind::do_call
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:589:40
  83: __rust_try
  84: std::panicking::catch_unwind
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:552:19
  85: std::panic::catch_unwind
             at /home/mbp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:359:14
  86: salsa::cancelled::Cancelled::catch
             at /home/mbp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/salsa-0.22.0/src/cancelled.rs:34:15
  87: ide::Analysis::with_db
             at ./crates/ide/src/lib.rs:867:9
  88: ide::Analysis::full_diagnostics
             at ./crates/ide/src/lib.rs:739:14
  89: rust_analyzer::cli::diagnostics::<impl rust_analyzer::cli::flags::Diagnostics>::run_
             at ./crates/rust-analyzer/src/cli/diagnostics.rs:71:22
  90: rust_analyzer::cli::diagnostics::<impl rust_analyzer::cli::flags::Diagnostics>::run::{{closure}}
             at ./crates/rust-analyzer/src/cli/diagnostics.rs:23:24
  91: stdx::thread::Builder::spawn::{{closure}}
             at ./crates/stdx/src/thread.rs:68:13
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

@sourcefrog
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And it seems to be coming from this concat! call, probably:

https://github.com/GREsau/schemars/blob/e4653c7c738299ca865269970ec1aad6b77f6a01/schemars_derive/src/attr/doc.rs#L5-L37

@sourcefrog
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I poked around but it looks like it'll take more time than I have free at the moment to understand how RA does macro expansion. I don't understand why it is ever treating this text as something that should be parsed. It's only ever inside a docstring or quoted string, as far as I can see.

@ChayimFriedman2
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Without digging deep, I suspect the problem is that r-a adds parentheses in the call to concat!(), causing errors.

This will likely require a big fix, so if you don't want to invest a lot of time in it I suggest you don't try to fix this.

@sourcefrog
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Thanks, I won't claim this.

I tried a couple more things, one of which was to make the proc macro print out what it's getting as input.

From rustc it gets the right doc attribute:

macro called with doc: TokenStream [Punct { ch: ':', spacing: Joint, span: #11 bytes(103..113) }, Punct { ch: ':', spacing: Alone, span: #11 bytes(103..113) }, Ident { ident: "core", span: #11 bytes(103..113) }, Punct { ch: ':', spacing: Joint, span: #11 bytes(103..113) }, Punct { ch: ':', spacing: Alone, span: #11 bytes(103..113) }, Ident { ident: "concat", span: #11 bytes(103..113) }, Punct { ch: '!', spacing: Alone, span: #11 bytes(103..113) }, Group { delimiter: Parenthesis, stream: TokenStream [Literal { kind: Str, symbol: "A docstring with a - causes a problem.", suffix: None, span: #11 bytes(103..113) }], span: #11 bytes(103..113) }]

versus RA

macro called with doc: TokenStream [Punct { ch: ':', spacing: Joint, span: SpanData { range: 238..264, anchor: SpanAnchor(EditionedFileId(28, Edition2021), 15), ctx: SyntaxContext(87835) } }, Punct { ch: ':', spacing: Alone, span: SpanData { range: 238..264, anchor: SpanAnchor(EditionedFileId(28, Edition2021), 15), ctx: SyntaxContext(87835) } }, Ident { ident: "core", span: SpanData { range: 238..264, anchor: SpanAnchor(EditionedFileId(28, Edition2021), 15), ctx: SyntaxContext(87835) } }, Punct { ch: ':', spacing: Joint, span: SpanData { range: 238..264, anchor: SpanAnchor(EditionedFileId(28, Edition2021), 15), ctx: SyntaxContext(87835) } }, Punct { ch: ':', spacing: Alone, span: SpanData { range: 238..264, anchor: SpanAnchor(EditionedFileId(28, Edition2021), 15), ctx: SyntaxContext(87835) } }, Ident { ident: "concat", span: SpanData { range: 238..264, anchor: SpanAnchor(EditionedFileId(28, Edition2021), 15), ctx: SyntaxContext(87835) } }, Punct { ch: '!', spacing: Alone, span: SpanData { range: 238..264, anchor: SpanAnchor(EditionedFileId(28, Edition2021), 15), ctx: SyntaxContext(87835) } }, Group { delimiter: Parenthesis, stream: TokenStream [Punct { ch: '-', spacing: Alone, span: SpanData { range: 238..264, anchor: SpanAnchor(EditionedFileId(28, Edition2021), 15), ctx: SyntaxContext(87835) } }, Literal { kind: Str, symbol: " causes a problem.", suffix: None, span: SpanData { range: 238..264, anchor: SpanAnchor(EditionedFileId(28, Edition2021), 15), ctx: SyntaxContext(87835) } }], span: SpanData { range: 238..264, anchor: SpanAnchor(EditionedFileId(28, Edition2021), 15), ctx: SyntaxContext(87835) } }]

The same problem shows up if I make it an explicit attribute rather than a docstring:

    #[doc = "A docstring with a - causes a problem."]

I wonder if there's some code that's trying to interpret or preprocess attributes before they're passed to proc macros?

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@sourcefrog @Veykril @ChayimFriedman2