error[E0284]: type annotations needed --> $DIR/method-chain.rs:15:33 | LL | Foo.bar().bar().bar().bar().baz(); | ^^^ cannot infer the value of the const parameter `N` declared on the method `baz` | note: required by a const generic parameter in `Foo::baz` --> $DIR/method-chain.rs:8:12 | LL | fn baz(self) -> Foo { | ^^^^^^^^^^^^^^ required by this const generic parameter in `Foo::baz` help: consider specifying the generic argument | LL | Foo.bar().bar().bar().bar().baz::(); | +++++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0284`.