| 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::<isize>::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<A, B, C = (A, B)>( | 
 |    |        ^^^ -  - | 
 | help: add missing generic argument | 
 |    | | 
 | LL |     Foo::<isize, B>::new(); | 
 |    |                +++ | 
 |  | 
 | error: aborting due to 1 previous error | 
 |  | 
 | For more information about this error, try `rustc --explain E0107`. |