Static kCTFontCollectionDisallowAutoActivationOption 

pub unsafe static kCTFontCollectionDisallowAutoActivationOption: &'static CFString

Available on crate feature CTFontCollection only.

kCTFontCollectionDisallowAutoActivationOption

Option key to avoid auto-activating fonts.

Specify this option key in the options dictionary with a non-zero value to disallow searches for missing fonts (font descriptors returning no results).

See also Apple’s documentation