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, 25 insertions, 0 deletions

diff --git a/compiler/rustc_error_codes/src/error_codes/E0403.md b/compiler/rustc_error_codes/src/error_codes/E0403.md
new file mode 100644
index 000000000..5f4a40ce9
--- /dev/null
+++ b/compiler/rustc_error_codes/src/error_codes/E0403.md
@@ -0,0 +1,25 @@
+Some type parameters have the same name.
+
+Erroneous code example:
+
+```compile_fail,E0403
+fn f<T, T>(s: T, u: T) {} // error: the name `T` is already used for a generic
+                          //        parameter in this item's generic parameters
+```
+
+Please verify that none of the type parameters are misspelled, and rename any
+clashing parameters. Example:
+
+```
+fn f<T, Y>(s: T, u: Y) {} // ok!
+```
+
+Type parameters in an associated item also cannot shadow parameters from the
+containing item:
+
+```compile_fail,E0403
+trait Foo<T> {
+    fn do_something(&self) -> T;
+    fn do_something_else<T: Clone>(&self, bar: T);
+}
+```