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+The `inline` attribute was malformed.
+
+Erroneous code example:
+
+```compile_fail,E0534
+#[inline()] // error: expected one argument
+pub fn something() {}
+
+fn main() {}
+```
+
+The parenthesized `inline` attribute requires the parameter to be specified:
+
+```
+#[inline(always)]
+fn something() {}
+```
+
+or:
+
+```
+#[inline(never)]
+fn something() {}
+```
+
+Alternatively, a paren-less version of the attribute may be used to hint the
+compiler about inlining opportunity:
+
+```
+#[inline]
+fn something() {}
+```
+
+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