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, 26 insertions, 0 deletions

diff --git a/compiler/rustc_error_codes/src/error_codes/E0137.md b/compiler/rustc_error_codes/src/error_codes/E0137.md
new file mode 100644
index 000000000..d4e19170f
--- /dev/null
+++ b/compiler/rustc_error_codes/src/error_codes/E0137.md
@@ -0,0 +1,26 @@
+#### Note: this error code is no longer emitted by the compiler.
+
+More than one function was declared with the `#[main]` attribute.
+
+Erroneous code example:
+
+```compile_fail
+#![feature(main)]
+
+#[main]
+fn foo() {}
+
+#[main]
+fn f() {} // error: multiple functions with a `#[main]` attribute
+```
+
+This error indicates that the compiler found multiple functions with the
+`#[main]` attribute. This is an error because there must be a unique entry
+point into a Rust program. Example:
+
+```compile_fail
+#![feature(main)]
+
+#[main]
+fn f() {} // ok!
+```