tests fail on macOS #2245

 INFO Testing chapter 'Application binary interface': "abi.md"
ERROR rustdoc returned an error:

--- stdout

running 4 tests
test abi.md - Application_binary_interface__ABI_::The_ (line 142) - compile ... FAILED
test abi.md - Application_binary_interface__ABI_::The_ (line 36) ... ok
test abi.md - Application_binary_interface__ABI_::The_ (line 104) ... ok
test abi.md - Application_binary_interface__ABI_::The_ (line 202) ... ok

failures:

---- abi.md - Application_binary_interface__ABI_::The_ (line 142) stdout ----
error: invalid Mach-O section specifier
   --> abi.md:144:25
    |
144 | #[unsafe(link_section = ".example_section")]
    |                         ^^^^^^^^^^^^^^^^^^ not a valid Mach-O section specifier
    |
    = note: a Mach-O section specifier requires a segment and a section, separated by a comma
    = help: an example of a valid Mach-O section specifier is `__TEXT,__cstring`

error: aborting due to 1 previous error

Couldn't compile the test.

failures:
    abi.md - Application_binary_interface__ABI_::The_ (line 142)

test result: FAILED. 3 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.43s

all doctests ran in 0.45s; merged doctests compilation took 0.02s

--- stderr

 INFO Testing chapter 'The Rust runtime': "runtime.md"