error[E0689]: can't call method `f` on ambiguous numeric type `{integer}`
  --> $DIR/issue-41652.rs:9:11
   |
LL |         3.f()
   |           ^
   |
help: you must specify a concrete type for this numeric value, like `i32`
   |
LL |         3_i32.f()
   |         ~~~~~

error: aborting due to previous error

For more information about this error, try `rustc --explain E0689`.