[Chapter 5.3] compiled code seems to be optimized about discovery HOT 1 OPEN

(gdb) disassemble /m
Dump of assembler code for function _ZN12led_roulette18__cortex_m_rt_main17h327bbe3f14bd160dE:
8       fn main() -> ! {
   0x080001ea <+0>:     sub     sp, #8
   0x080001ec <+2>:     movs    r0, #42 @ 0x2a

9           let _y;
10          let x = 42;
=> 0x080001ee <+4>:     str     r0, [sp, #0]
   0x080001f0 <+6>:     str     r0, [sp, #4]

(gdb) stepi      
halted: PC: 0x080001ec
0x080001ec      8       fn main() -> ! {

(gdb) info locals
No locals.

(gdb) stepi      
halted: PC: 0x080001ee
10          let x = 42;

(gdb) info locals
x = 42
_y = 42