Auto merge of #71367 - Dylan-DPC:rollup-ysj4olr, r=Dylan-DPC

Rollup of 4 pull requests

Successful merges:

 - #69362 (Stabilize most common subset of alloc_layout_extras)
 - #71174 (Check that main/start is not async)
 - #71285 (MIR: use HirId instead of NodeId to avoid cycles while inlining)
 - #71346 (Do not build tools if user do not want them)

Failed merges:

r? @ghost

1 files changed, 11 insertions, 0 deletions

diff --git a/src/librustc_error_codes/error_codes/E0752.md b/src/librustc_error_codes/error_codes/E0752.md
new file mode 100644
index 00000000000..86945f83b55
--- /dev/null
+++ b/src/librustc_error_codes/error_codes/E0752.md
@@ -0,0 +1,11 @@
+`fn main()` or the specified start function is not allowed to be
+async. You might be seeing this error because your async runtime
+library is not set up correctly.
+
+Erroneous code example:
+
+```compile_fail,E0752
+async fn main() -> Result<i32, ()> {
+    Ok(1)
+}
+```