#![feature(box_syntax)] #[allow(non_camel_case_types)] trait bar { fn dup(&self) -> Self; fn blah(&self); } impl bar for i32 { fn dup(&self) -> i32 { *self } fn blah(&self) {} } impl bar for u32 { fn dup(&self) -> u32 { *self } fn blah(&self) {} } fn main() { 10.dup::(); //~ ERROR wrong number of type arguments: expected 0, found 1 10.blah::(); //~ ERROR wrong number of type arguments: expected 1, found 2 (box 10 as Box).dup(); //~^ ERROR E0038 //~| ERROR E0038 }