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trait Dim { fn dim() -> usize; } enum Dim3 {} impl Dim for Dim3 { fn dim() -> usize { 3 } } fn main() { let array: [usize; Dim3::dim()] //~^ ERROR E0015 //~| ERROR E0080 = [0; Dim3::dim()]; //~^ ERROR E0015 //~| ERROR E0080 }