TestSwift`top_level_code at main.swift:
0x100179fa0:  pushq  %rbp
0x100179fa1:  movq   %rsp, %rbp
0x100179fa4:  subq   $0xb0, %rsp
0x100179fab:  movq   $0x0, -0x18(%rbp)
0x100179fb3:  movq   $0x0, -0x20(%rbp)
0x100179fbb:  movq   $0x0, -0x10(%rbp)
0x100179fc3:  movb   $0x1, -0x8(%rbp)
0x100179fc7:  movq   -0x10(%rbp), %rax
0x100179fcb:  movq   -0x20(%rbp), %rcx
0x100179fcf:  movq   -0x18(%rbp), %rdx
0x100179fd3:  movq   %rdx, 0x5fbd6(%rip)       ; TestSwift.canBeNil : Swift.Optional<Swift.String> + 8
0x100179fda:  movq   %rcx, 0x5fbc7(%rip)       ; TestSwift.canBeNil : Swift.Optional<Swift.String>
0x100179fe1:  movq   %rax, 0x5fbd0(%rip)       ; TestSwift.canBeNil : Swift.Optional<Swift.String> + 16
0x100179fe8:  movb   $0x1, 0x5fbd1(%rip)       ; TestSwift.canBeNil : Swift.Optional<Swift.String> + 23
0x100179fef:  leaq   -0x40(%rbp), %rax
0x100179ff3:  movb   $0x1, %sil
0x100179ff6:  testb  %sil, %sil
0x100179ff9:  movq   %rax, -0xa0(%rbp)
0x10017a000:  jne    0x10017a04e               ; top_level_code + 174 at main.swift:3
0x10017a002:  jmp    0x10017a004               ; top_level_code + 100 at main.swift:3
0x10017a004:  movq   0x5fb9d(%rip), %rax       ; TestSwift.canBeNil : Swift.Optional<Swift.String>
0x10017a00b:  movq   -0xa0(%rbp), %rcx
0x10017a012:  movq   %rax, (%rcx)
0x10017a015:  movq   0x5fb94(%rip), %rax       ; TestSwift.canBeNil : Swift.Optional<Swift.String> + 8
0x10017a01c:  movq   %rax, 0x8(%rcx)
0x10017a020:  movq   0x5fb91(%rip), %rax       ; TestSwift.canBeNil : Swift.Optional<Swift.String> + 16
0x10017a027:  movq   %rax, %rdi
0x10017a02a:  movq   %rax, -0xa8(%rbp)
0x10017a031:  callq  0x1001a30b0               ; swift_unknownRetain
0x10017a036:  movq   -0xa0(%rbp), %rax
0x10017a03d:  movq   -0xa8(%rbp), %rcx
0x10017a044:  movq   %rcx, 0x10(%rax)
0x10017a048:  movb   $0x0, -0x28(%rbp)
0x10017a04c:  jmp    0x10017a07e               ; top_level_code + 222 at main.swift:3
0x10017a04e:  movq   0x5fb63(%rip), %rax       ; TestSwift.canBeNil : Swift.Optional<Swift.String> + 16
0x10017a055:  movq   0x5fb4c(%rip), %rcx       ; TestSwift.canBeNil : Swift.Optional<Swift.String>
0x10017a05c:  movq   0x5fb4d(%rip), %rdx       ; TestSwift.canBeNil : Swift.Optional<Swift.String> + 8
0x10017a063:  movb   0x5fb56(%rip), %sil       ; TestSwift.canBeNil : Swift.Optional<Swift.String> + 24
0x10017a06a:  movq   %rdx, -0x38(%rbp)
0x10017a06e:  movq   %rcx, -0x40(%rbp)
0x10017a072:  movq   %rax, -0x30(%rbp)
0x10017a076:  andb   $0x1, %sil
0x10017a07a:  movb   %sil, -0x28(%rbp)
0x10017a07e:  leaq   0x4fe2b(%rip), %rax       ; direct type metadata for Swift.String
0x10017a085:  addq   $0x8, %rax
0x10017a08b:  leaq   0x466a6(%rip), %rcx       ; protocol witness table for Swift.String : Swift.Equatable
0x10017a092:  leaq   -0x60(%rbp), %rdx
0x10017a096:  leaq   -0x40(%rbp), %rsi
0x10017a09a:  movq   $0x0, -0x78(%rbp)
0x10017a0a2:  movq   $0x0, -0x80(%rbp)
0x10017a0aa:  movq   $0x0, -0x70(%rbp)
0x10017a0b2:  movb   $0x1, -0x68(%rbp)
0x10017a0b6:  movq   -0x70(%rbp), %rdi
0x10017a0ba:  movq   -0x80(%rbp), %r8
0x10017a0be:  movq   -0x78(%rbp), %r9
0x10017a0c2:  movb   -0x68(%rbp), %r10b
0x10017a0c6:  movq   %r9, -0x58(%rbp)
0x10017a0ca:  movq   %r8, -0x60(%rbp)
0x10017a0ce:  movq   %rdi, -0x50(%rbp)
0x10017a0d2:  andb   $0x1, %r10b
0x10017a0d6:  movb   %r10b, -0x48(%rbp)
0x10017a0da:  movq   %rsi, %rdi
0x10017a0dd:  movq   %rdx, %rsi
0x10017a0e0:  movq   %rax, %rdx
0x10017a0e3:  callq  0x100005c60               ; Swift.!= infix <A : Swift.Equatable>(Swift.Optional<A>, Swift.Optional<A>) -> Swift.Bool
0x10017a0e8:  testb  $0x1, %al
0x10017a0ea:  jne    0x10017a0ee               ; top_level_code + 334 at main.swift:3
0x10017a0ec:  jmp    0x10017a138               ; top_level_code + 408 at main.swift:3
0x10017a0ee:  leaq   0x316db(%rip), %rdi       ; "canBeNil isn't nil"
0x10017a0f5:  movabsq $0x12, %rsi
0x10017a0ff:  movl   $0x1, %edx
0x10017a104:  callq  0x100016b30               ; Swift.String.init (Swift.String.Type)(_builtinStringLiteral : Builtin.RawPointer, byteSize : Builtin.Word, isASCII : Builtin.Int1) -> Swift.String
0x10017a109:  leaq   0x4fda0(%rip), %rsi       ; direct type metadata for Swift.String
0x10017a110:  addq   $0x8, %rsi
0x10017a117:  leaq   -0x98(%rbp), %rdi
0x10017a11e:  movq   %rax, -0x98(%rbp)
0x10017a125:  movq   %rdx, -0x90(%rbp)
0x10017a12c:  movq   %rcx, -0x88(%rbp)
0x10017a133:  callq  0x1000b8b10               ; Swift.println <A>(A) -> ()
0x10017a138:  addq   $0xb0, %rsp
0x10017a13f:  popq   %rbp
0x10017a140:  retq