error: Undefined Behavior: `fmul_fast` intrinsic called with non-finite value as second parameter
  --> $DIR/fast_math_second.rs:LL:CC
   |
LL | ...f32 = core::intrinsics::fmul_fast(3.4f32, f32::INFINITY);
   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `fmul_fast` intrinsic called with non-finite value as second parameter
   |
   = 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/fast_math_second.rs:LL:CC

note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

error: aborting due to 1 previous error