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, 20 insertions, 0 deletions

diff --git a/compiler/rustc_error_codes/src/error_codes/E0054.md b/compiler/rustc_error_codes/src/error_codes/E0054.md
new file mode 100644
index 000000000..c3eb375fb
--- /dev/null
+++ b/compiler/rustc_error_codes/src/error_codes/E0054.md
@@ -0,0 +1,20 @@
+It is not allowed to cast to a bool.
+
+Erroneous code example:
+
+```compile_fail,E0054
+let x = 5;
+
+// Not allowed, won't compile
+let x_is_nonzero = x as bool;
+```
+
+If you are trying to cast a numeric type to a bool, you can compare it with
+zero instead:
+
+```
+let x = 5;
+
+// Ok
+let x_is_nonzero = x != 0;
+```