error[E0425]: cannot find value `LOG10_2` in module `std::f64` --> $DIR/issue-50599.rs:3:48 | LL | const M: usize = (f64::from(N) * std::f64::LOG10_2) as usize; | ^^^^^^^ not found in `std::f64` | help: consider importing one of these items | LL + use std::f32::consts::LOG10_2; | LL + use std::f64::consts::LOG10_2; | help: if you import `LOG10_2`, refer to it directly | LL - const M: usize = (f64::from(N) * std::f64::LOG10_2) as usize; LL + const M: usize = (f64::from(N) * LOG10_2) as usize; | error: aborting due to previous error For more information about this error, try `rustc --explain E0425`.