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+Attempted to call something which isn't a function nor a method.
+
+Erroneous code examples:
+
+```compile_fail,E0618
+enum X {
+    Entry,
+}
+
+X::Entry(); // error: expected function, tuple struct or tuple variant,
+            // found `X::Entry`
+
+// Or even simpler:
+let x = 0i32;
+x(); // error: expected function, tuple struct or tuple variant, found `i32`
+```
+
+Only functions and methods can be called using `()`. Example:
+
+```
+// We declare a function:
+fn i_am_a_function() {}
+
+// And we call it:
+i_am_a_function();
+```