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diff --git a/compiler/rustc_error_codes/src/error_codes/E0422.md b/compiler/rustc_error_codes/src/error_codes/E0422.md
new file mode 100644
index 000000000..828a52e73
--- /dev/null
+++ b/compiler/rustc_error_codes/src/error_codes/E0422.md
@@ -0,0 +1,22 @@
+An identifier that is neither defined nor a struct was used.
+
+Erroneous code example:
+
+```compile_fail,E0422
+fn main () {
+    let x = Foo { x: 1, y: 2 };
+}
+```
+
+In this case, `Foo` is undefined, so it inherently isn't anything, and
+definitely not a struct.
+
+```compile_fail
+fn main () {
+    let foo = 1;
+    let x = foo { x: 1, y: 2 };
+}
+```
+
+In this case, `foo` is defined, but is not a struct, so Rust can't use it as
+one.