gistfile1.rs

fn main() {
    let x = unsafe {
        std::rt::heap::allocate(4, 4)
    };
}

gistfile2.asm

	.text
	.file	"rust-out.0.rs"
	.section	.text._ZN4main20h192b90aae64a142feaaE,"ax",@progbits
	.align	16, 0x90
	.type	_ZN4main20h192b90aae64a142feaaE,@function
_ZN4main20h192b90aae64a142feaaE:
	.cfi_startproc
	movl	$4, %edi
	xorl	%esi, %esi
	jmp	je_mallocx@PLT
.Ltmp0:
	.size	_ZN4main20h192b90aae64a142feaaE, .Ltmp0-_ZN4main20h192b90aae64a142feaaE
	.cfi_endproc

	.section	.text.main,"ax",@progbits
	.globl	main
	.align	16, 0x90
	.type	main,@function
main:
	.cfi_startproc
	movq	%rsi, %rax
	movq	%rdi, %rcx
	leaq	_ZN4main20h192b90aae64a142feaaE(%rip), %rdi
	movq	%rcx, %rsi
	movq	%rax, %rdx
	jmp	_ZN2rt10lang_start20h099797e429a886b1iZzE@PLT
.Ltmp1:
	.size	main, .Ltmp1-main
	.cfi_endproc


	.section	".note.GNU-stack","",@progbits