error[E0107]: this 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 previous error

For more information about this error, try `rustc --explain E0107`.