Compatibility with name-out-of-scope warning

[mroch]

In our project (https://github.com/facebook/flow) we generally enable the name-out-of-scope warning. The code generated by [%expect ...] seems to trip it:

Error (warning 40 [name-out-of-scope]): this record of type Expect_test_common.File.Location.t contains fields that are 
not visible in the current scope: filename line_number line_start start_pos end_pos.
They will not be selected if the type becomes unknown.

I think it's coming from here:

ppx_expect/src/main.ml

Lines 11 to 20 in a1f22ff

	[%expr
	({ filename =
	Expect_test_common.File.Name.of_string
	[%e estring ~loc (File.Name.to_string filename)]
	; line_number = [%e eint ~loc line_number]
	; line_start = [%e eint ~loc line_start]
	; start_pos = [%e eint ~loc start_pos]
	; end_pos = [%e eint ~loc end_pos]
	}
	: Expect_test_common.File.Location.t)]

Would you mind explicitly scoping that record, or perhaps suppressing the warning?