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+An unknown argument was given to the `inline` attribute.
+
+Erroneous code example:
+
+```compile_fail,E0535
+#[inline(unknown)] // error: invalid argument
+pub fn something() {}
+
+fn main() {}
+```
+
+The `inline` attribute only supports two arguments:
+
+ * always
+ * never
+
+All other arguments given to the `inline` attribute will return this error.
+Example:
+
+```
+#[inline(never)] // ok!
+pub fn something() {}
+
+fn main() {}
+```
+
+For more information see the [`inline` Attribute][inline-attribute] section
+of the Reference.
+
+[inline-attribute]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute