error[E0689]: can't call method `recip` on ambiguous numeric type `{float}` --> $DIR/issue-90974.rs:2:25 | LL | println!("{}", (3.).recip()); | ^^^^^ | help: you must specify a concrete type for this numeric value, like `f32` | LL | println!("{}", (3_f32).recip()); | ~~~~~ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0689`.