error: Undefined Behavior: `float_to_int_unchecked` intrinsic called on 1.8446744073709552E+19 which cannot be represented in target type `u64` --> $DIR/float_to_int_64_too_big3.rs:LL:CC | LL | float_to_int_unchecked::(18446744073709551616.0f64); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `float_to_int_unchecked` intrinsic called on 1.8446744073709552E+19 which cannot be represented in target type `u64` | = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information = note: BACKTRACE: = note: inside `main` at $DIR/float_to_int_64_too_big3.rs:LL:CC note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace error: aborting due to previous error