Rollup merge of #77419 - GuillaumeGomez:create-e0777, r=jyn514

Create E0777 error code for invalid argument in derive

The second commit is to fix a nit reported by @jyn514 [here](https://github.com/rust-lang/rust/pull/76406/files#r485186592).

2 files changed, 28 insertions, 0 deletions

diff --git a/src/test/ui/error-codes/E0777.rs b/src/test/ui/error-codes/E0777.rs
new file mode 100644
index 00000000000..ff70f736866
--- /dev/null
+++ b/src/test/ui/error-codes/E0777.rs
@@ -0,0 +1,7 @@
+#[derive("Clone")] //~ ERROR E0777
+#[derive("Clone
+")]
+//~^^ ERROR E0777
+struct Foo;
+
+fn main() {}
diff --git a/src/test/ui/error-codes/E0777.stderr b/src/test/ui/error-codes/E0777.stderr
new file mode 100644
index 00000000000..ea73c58993e
--- /dev/null
+++ b/src/test/ui/error-codes/E0777.stderr
@@ -0,0 +1,21 @@
+error[E0777]: expected path to a trait, found literal
+  --> $DIR/E0777.rs:1:10
+   |
+LL | #[derive("Clone")]
+   |          ^^^^^^^
+   |
+   = help: try using `#[derive(Clone)]`
+
+error[E0777]: expected path to a trait, found literal
+  --> $DIR/E0777.rs:2:10
+   |
+LL |   #[derive("Clone
+   |  __________^
+LL | | ")]
+   | |_^
+   |
+   = help: for example, write `#[derive(Debug)]` for `Debug`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0777`.