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, 22 insertions, 0 deletions

diff --git a/compiler/rustc_error_codes/src/error_codes/E0275.md b/compiler/rustc_error_codes/src/error_codes/E0275.md
new file mode 100644
index 000000000..2d12fcea4
--- /dev/null
+++ b/compiler/rustc_error_codes/src/error_codes/E0275.md
@@ -0,0 +1,22 @@
+An evaluation of a trait requirement overflowed.
+
+Erroneous code example:
+
+```compile_fail,E0275
+trait Foo {}
+
+struct Bar<T>(T);
+
+impl<T> Foo for T where Bar<T>: Foo {}
+```
+
+This error occurs when there was a recursive trait requirement that overflowed
+before it could be evaluated. This often means that there is an unbounded
+recursion in resolving some type bounds.
+
+To determine if a `T` is `Foo`, we need to check if `Bar<T>` is `Foo`. However,
+to do this check, we need to determine that `Bar<Bar<T>>` is `Foo`. To
+determine this, we check if `Bar<Bar<Bar<T>>>` is `Foo`, and so on. This is
+clearly a recursive requirement that can't be resolved directly.
+
+Consider changing your trait bounds so that they're less self-referential.