Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/compiler/rustc_error_codes/src/error_codes/E0744.md b/compiler/rustc_error_codes/src/error_codes/E0744.md
new file mode 100644
index 000000000..9a8ef3b84
--- /dev/null
+++ b/compiler/rustc_error_codes/src/error_codes/E0744.md
@@ -0,0 +1,16 @@
+An unsupported expression was used inside a const context.
+
+Erroneous code example:
+
+```compile_fail,edition2018,E0744
+const _: i32 = {
+    async { 0 }.await
+};
+```
+
+At the moment, `.await` is forbidden inside a `const`, `static`, or `const fn`.
+
+This may be allowed at some point in the future, but the implementation is not
+yet complete. See the tracking issue for [`async`] in `const fn`.
+
+[`async`]: https://github.com/rust-lang/rust/issues/69431