Closed
Description
Invoking this proc macro and running cargo doc rusults in a crash the the error could not find markdown in source:
#[proc_macro]
pub fn foo(_: TokenStream) -> TokenStream {
"/// https://foobar.com\npub struct Foo;".parse().unwrap()
}If this code were written directly rather than generated by a proc macro, this would produce warning: this URL is not a hyperlink. But I guess when it goes through a proc macro it can't generate correct span information for the warning and crashes.
I originally noticed this with the schemafy::schemafy! macro.
Meta
rustc --version --verbose:
rustc 1.60.0-nightly (89b9f7b28 2022-01-10)
Backtrace
thread 'rustc' panicked at 'could not find markdown in source', src/librustdoc/passes/mod.rs:181:48
stack backtrace:
0: rust_begin_unwind
at /rustc/89b9f7b284aacc5f8613438b80e4dd7bdd10549e/library/std/src/panicking.rs:498:5
1: core::panicking::panic_fmt
at /rustc/89b9f7b284aacc5f8613438b80e4dd7bdd10549e/library/core/src/panicking.rs:110:14
2: core::panicking::panic_display
at /rustc/89b9f7b284aacc5f8613438b80e4dd7bdd10549e/library/core/src/panicking.rs:65:5
3: core::panicking::panic_str
at /rustc/89b9f7b284aacc5f8613438b80e4dd7bdd10549e/library/core/src/panicking.rs:56:5
4: core::option::expect_failed
at /rustc/89b9f7b284aacc5f8613438b80e4dd7bdd10549e/library/core/src/option.rs:1817:5
5: rustdoc::passes::source_span_for_markdown_range
6: <rustdoc::passes::bare_urls::BareUrlsLinter as rustdoc::visit::DocVisitor>::visit_item
7: <rustdoc::passes::bare_urls::BareUrlsLinter as rustdoc::visit::DocVisitor>::visit_inner_recur
8: <rustdoc::passes::bare_urls::BareUrlsLinter as rustdoc::visit::DocVisitor>::visit_item
9: rustdoc::passes::bare_urls::check_bare_urls
10: <rustc_session::session::Session>::time::<rustdoc::clean::types::Crate, rustdoc::core::run_global_ctxt::{closure#8}>
11: rustdoc::core::run_global_ctxt
12: <rustc_session::session::Session>::time::<(rustdoc::clean::types::Crate, rustdoc::config::RenderOptions, rustdoc::formats::cache::Cache), rustdoc::main_options::{closure#0}::{closure#0}::{closure#1}::{closure#0}>
13: <rustc_interface::passes::QueryContext>::enter::<rustdoc::main_options::{closure#0}::{closure#0}::{closure#1}, core::result::Result<(), rustc_errors::ErrorReported>>
14: <rustc_interface::interface::Compiler>::enter::<rustdoc::main_options::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>
15: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustdoc::main_options::{closure#0}>::{closure#1}>
16: rustc_interface::interface::create_compiler_and_run::<core::result::Result<(), rustc_errors::ErrorReported>, rustdoc::main_options::{closure#0}>
17: rustdoc::main_options
18: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustdoc::main_args::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: internal compiler error: unexpected panic
error: Unrecognized option: 'crate-version'
error: could not document `proc-macro-bug`
Caused by:
process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name proc_macro_bug src/lib.rs -o /home/ian/src/proc-macro-bug/target/doc --error-format=json --json=diagnostic-rendered-ansi,future-incompat -C metadata=f8594ed8329b26d0 -L dependency=/home/ian/src/proc-macro-bug/target/debug/deps --extern macros=/home/ian/src/proc-macro-bug/target/debug/deps/libmacros-4807c026ed1d48b2.so --crate-version 0.1.0` (exit status: 1)