Auto merge of #64438 - cuviper:beta-rollup, r=Mark-Simulacrum

[beta] Rollup backports

Cherry-picked:

- Permit unwinding through FFI by default #62603
- pprust: Do not print spaces before some tokens #63897
- Account for doc comments coming from proc macros without spans #63930
- Support "soft" feature-gating using a lint #64066
- Update xLTO compatibility table in rustc book. #64092
- Include compiler-rt in the source tarball #64240
- Update LLVM submodule #64317

r? @Mark-Simulacrum

1 files changed, 1 insertions, 1 deletions

diff --git a/src/librustdoc/passes/check_code_block_syntax.rs b/src/librustdoc/passes/check_code_block_syntax.rs
index 357e17d2d1b..67aa014a788 100644
--- a/src/librustdoc/passes/check_code_block_syntax.rs
+++ b/src/librustdoc/passes/check_code_block_syntax.rs
@@ -69,7 +69,7 @@ impl<'a, 'tcx> SyntaxChecker<'a, 'tcx> {
                 // We couldn't calculate the span of the markdown block that had the error, so our
                 // diagnostics are going to be a bit lacking.
                 let mut diag = self.cx.sess().struct_span_warn(
-                    super::span_of_attrs(&item.attrs),
+                    super::span_of_attrs(&item.attrs).unwrap_or(item.source.span()),
                     "doc comment contains an invalid Rust code block",
                 );