error: Undefined Behavior: `float_to_int_unchecked` intrinsic called on 3.4028236692093846E+38f64 which cannot be represented in target type `u128`
  --> tests/fail/intrinsics/float_to_int_64_too_big4.rs:LL:CC
   |
LL |         float_to_int_unchecked::<f64, u128>(u128::MAX as f64);
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
   |
   = 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: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

error: aborting due to 1 previous error

