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, 20 insertions, 0 deletions

diff --git a/src/test/rustdoc/auxiliary/through-proc-macro-aux.rs b/src/test/rustdoc/auxiliary/through-proc-macro-aux.rs
new file mode 100644
index 00000000000..5c4a01ee3a7
--- /dev/null
+++ b/src/test/rustdoc/auxiliary/through-proc-macro-aux.rs
@@ -0,0 +1,20 @@
+// force-host
+// no-prefer-dynamic
+#![crate_type = "proc-macro"]
+#![crate_name="some_macros"]
+
+extern crate proc_macro;
+use proc_macro::TokenStream;
+
+#[proc_macro_attribute]
+pub fn first(_attr: TokenStream, item: TokenStream) -> TokenStream {
+    item // This doesn't erase the spans.
+}
+
+#[proc_macro_attribute]
+pub fn second(_attr: TokenStream, item: TokenStream) -> TokenStream {
+    // Make a new `TokenStream` to erase the spans:
+    let mut out: TokenStream = TokenStream::new();
+    out.extend(item);
+    out
+}