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+A unrecognized representation attribute was used.
+
+Erroneous code example:
+
+```compile_fail,E0552
+#[repr(D)] // error: unrecognized representation hint
+struct MyStruct {
+    my_field: usize
+}
+```
+
+You can use a `repr` attribute to tell the compiler how you want a struct or
+enum to be laid out in memory.
+
+Make sure you're using one of the supported options:
+
+```
+#[repr(C)] // ok!
+struct MyStruct {
+    my_field: usize
+}
+```
+
+For more information about specifying representations, see the ["Alternative
+Representations" section] of the Rustonomicon.
+
+["Alternative Representations" section]: https://doc.rust-lang.org/nomicon/other-reprs.html