error[E0107]: struct takes at least 2 generic arguments but 1 generic argument was supplied --> $DIR/generic-impl-less-params-with-defaults.rs:11:5 | LL | Foo::::new(); | ^^^ ----- supplied 1 generic argument | | | expected at least 2 generic arguments | note: struct defined here, with at least 2 generic parameters: `A`, `B` --> $DIR/generic-impl-less-params-with-defaults.rs:3:8 | LL | struct Foo( | ^^^ - - help: add missing generic argument | LL | Foo::::new(); | +++ error: aborting due to previous error For more information about this error, try `rustc --explain E0107`.