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, 15 insertions, 0 deletions

diff --git a/compiler/rustc_error_codes/src/error_codes/E0030.md b/compiler/rustc_error_codes/src/error_codes/E0030.md
new file mode 100644
index 000000000..67d496da5
--- /dev/null
+++ b/compiler/rustc_error_codes/src/error_codes/E0030.md
@@ -0,0 +1,15 @@
+When matching against a range, the compiler verifies that the range is
+non-empty. Range patterns include both end-points, so this is equivalent to
+requiring the start of the range to be less than or equal to the end of the
+range.
+
+Erroneous code example:
+
+```compile_fail,E0030
+match 5u32 {
+    // This range is ok, albeit pointless.
+    1 ..= 1 => {}
+    // This range is empty, and the compiler can tell.
+    1000 ..= 5 => {}
+}
+```